Move Tuscany from Incubator to top level.

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@668359 13f79535-47bb-0310-9956-ffa450edef68

8 files changed, 891 insertions, 0 deletions

diff --git a/java/sca/modules/workspace-impl/src/main/java/org/apache/tuscany/sca/workspace/builder/impl/ContributionDependencyBuilderImpl.java b/java/sca/modules/workspace-impl/src/main/java/org/apache/tuscany/sca/workspace/builder/impl/ContributionDependencyBuilderImpl.java
new file mode 100644
index 0000000000..016c764d47
--- /dev/null
+++ b/java/sca/modules/workspace-impl/src/main/java/org/apache/tuscany/sca/workspace/builder/impl/ContributionDependencyBuilderImpl.java
@@ -0,0 +1,145 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.workspace.builder.impl;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.logging.Logger;
+
+import org.apache.tuscany.sca.assembly.builder.impl.ProblemImpl;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.DefaultImport;
+import org.apache.tuscany.sca.contribution.Export;
+import org.apache.tuscany.sca.contribution.Import;
+import org.apache.tuscany.sca.contribution.resolver.DefaultImportModelResolver;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+import org.apache.tuscany.sca.workspace.Workspace;
+import org.apache.tuscany.sca.workspace.builder.ContributionDependencyBuilder;
+
+/**
+ * A contribution dependency builder.
+ *
+ * @version $Rev$ $Date$
+ */
+public class ContributionDependencyBuilderImpl implements ContributionDependencyBuilder {
+    private static final Logger logger = Logger.getLogger(ContributionDependencyBuilderImpl.class.getName());
+    
+    private Monitor monitor;
+    
+    /**
+     * Constructs a new ContributionDependencyBuilder.
+     */
+    public ContributionDependencyBuilderImpl(Monitor monitor) {
+               
+        this.monitor = monitor;
+    }
+    
+    /**
+     * Calculate the set of contributions that a contribution depends on.
+     * @param contribution
+     * @param workspace
+     * @return
+     */
+    public List<Contribution> buildContributionDependencies(Contribution contribution, Workspace workspace) {
+        List<Contribution> dependencies = new ArrayList<Contribution>();
+        Set<Contribution> set = new HashSet<Contribution>();
+
+        dependencies.add(contribution);
+        set.add(contribution);
+        addContributionDependencies(contribution, workspace, dependencies, set);
+        
+        Collections.reverse(dependencies);
+        return dependencies;
+    }
+    
+    /**
+     * Analyze a contribution and add its dependencies to the given dependency set.
+     * @param contribution
+     * @param workspace
+     * @param dependencies
+     * @param set
+     */
+    private void addContributionDependencies(Contribution contribution, Workspace workspace, List<Contribution> dependencies, Set<Contribution> set) {
+        
+        // Go through the contribution imports
+        for (Import import_: contribution.getImports()) {
+            boolean resolved = false;
+            
+            // Go through all contribution candidates and their exports
+            List<Export> matchingExports = new ArrayList<Export>();
+            for (Contribution dependency: workspace.getContributions()) {
+                if (dependency == contribution) {
+                    // Do not self import
+                    continue;
+                }
+                for (Export export: dependency.getExports()) {
+                    
+                    // If an export from a contribution matches the import in hand
+                    // add that contribution to the dependency set
+                    if (import_.match(export)) {
+                        resolved = true;
+                        matchingExports.add(export);
+
+                        if (!set.contains(dependency)) {
+                            set.add(dependency);
+                            dependencies.add(dependency);
+                            
+                            // Now add the dependencies of that contribution 
+                            addContributionDependencies(dependency, workspace, dependencies, set);
+                        }
+                    }
+                }
+            }
+            
+            if (resolved) {
+                
+                // Initialize the import's model resolver with a delegating model
+                // resolver which will delegate to the matching exports 
+                import_.setModelResolver(new DefaultImportModelResolver(matchingExports));
+                
+            } else {
+                // Record import resolution issue
+                if (!(import_ instanceof DefaultImport)) {
+                    warning("UnresolvedImport", import_, import_);
+                }
+            }
+        }
+    }
+
+    /**
+     * Report a warning.
+     * 
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void warning(String message, Object model, Object... messageParameters) {
+        if (monitor != null) {
+            Problem problem = new ProblemImpl(getClass().getName(), "workspace-validation-messages", Severity.WARNING, model, message, (Object[])messageParameters);
+            monitor.problem(problem);
+        }
+    }
+
+}
diff --git a/java/sca/modules/workspace-impl/src/main/java/org/apache/tuscany/sca/workspace/processor/impl/ContributionContentProcessor.java b/java/sca/modules/workspace-impl/src/main/java/org/apache/tuscany/sca/workspace/processor/impl/ContributionContentProcessor.java
new file mode 100644
index 0000000000..880e95480e
--- /dev/null
+++ b/java/sca/modules/workspace-impl/src/main/java/org/apache/tuscany/sca/workspace/processor/impl/ContributionContentProcessor.java
@@ -0,0 +1,230 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.workspace.processor.impl;
+
+import java.io.File;
+import java.net.URI;
+import java.net.URL;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.contribution.Artifact;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.ContributionFactory;
+import org.apache.tuscany.sca.contribution.ContributionMetadata;
+import org.apache.tuscany.sca.contribution.DefaultExport;
+import org.apache.tuscany.sca.contribution.DefaultImport;
+import org.apache.tuscany.sca.contribution.Export;
+import org.apache.tuscany.sca.contribution.Import;
+import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
+import org.apache.tuscany.sca.contribution.processor.ExtensibleURLArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessorExtensionPoint;
+import org.apache.tuscany.sca.contribution.resolver.ClassReference;
+import org.apache.tuscany.sca.contribution.resolver.DefaultModelResolver;
+import org.apache.tuscany.sca.contribution.resolver.ExtensibleModelResolver;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolverExtensionPoint;
+import org.apache.tuscany.sca.contribution.scanner.ContributionScanner;
+import org.apache.tuscany.sca.contribution.service.ContributionReadException;
+import org.apache.tuscany.sca.contribution.service.ContributionResolveException;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.UtilityExtensionPoint;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.workspace.scanner.impl.DirectoryContributionScanner;
+import org.apache.tuscany.sca.workspace.scanner.impl.JarContributionScanner;
+
+/**
+ * URLArtifactProcessor that handles contribution files and the artifacts they contain
+ * and returns a contribution model.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class ContributionContentProcessor implements URLArtifactProcessor<Contribution>{
+    private ContributionFactory contributionFactory;
+    private ModelResolverExtensionPoint modelResolvers;
+    private ModelFactoryExtensionPoint modelFactories;
+    private URLArtifactProcessor<Object> artifactProcessor;
+    private StAXArtifactProcessor<Object> extensionProcessor;
+    private UtilityExtensionPoint utilities;
+    private Monitor monitor = null;
+
+    public ContributionContentProcessor(ExtensionPointRegistry extensionPoints, StAXArtifactProcessor<Object> extensionProcessor, Monitor monitor) {
+        this.modelFactories = extensionPoints.getExtensionPoint(ModelFactoryExtensionPoint.class);
+        this.modelResolvers = extensionPoints.getExtensionPoint(ModelResolverExtensionPoint.class);
+        hackResolvers(modelResolvers);
+        this.monitor = monitor;
+        URLArtifactProcessorExtensionPoint artifactProcessors = extensionPoints.getExtensionPoint(URLArtifactProcessorExtensionPoint.class);
+        this.artifactProcessor = new ExtensibleURLArtifactProcessor(artifactProcessors, this.monitor);
+        this.extensionProcessor = extensionProcessor;
+        this.contributionFactory = modelFactories.getFactory(ContributionFactory.class);
+    }
+    
+    public ContributionContentProcessor(ModelFactoryExtensionPoint modelFactories, ModelResolverExtensionPoint modelResolvers,
+                                        URLArtifactProcessor<Object> artifactProcessor, StAXArtifactProcessor<Object> extensionProcessor, Monitor monitor) {
+        this.modelFactories = modelFactories;
+        this.modelResolvers = modelResolvers;
+        hackResolvers(modelResolvers);
+        this.artifactProcessor = artifactProcessor;
+        this.extensionProcessor = extensionProcessor;
+        this.contributionFactory = modelFactories.getFactory(ContributionFactory.class);
+        this.monitor = monitor;
+    }
+    
+    public String getArtifactType() {
+        return ".contribution/content";
+    }
+    
+    public Class<Contribution> getModelType() {
+        return Contribution.class;
+    }
+    
+    public Contribution read(URL parentURL, URI contributionURI, URL contributionURL) throws ContributionReadException {
+        
+        // Create contribution model
+        Contribution contribution = contributionFactory.createContribution();
+        contribution.setURI(contributionURI.toString());
+        contribution.setLocation(contributionURL.toString());
+        ModelResolver modelResolver = new ExtensibleModelResolver(contribution, modelResolvers, modelFactories);
+        contribution.setModelResolver(modelResolver);
+        contribution.setUnresolved(true);
+
+        // Create a contribution scanner
+        ContributionScanner scanner;
+        if ("file".equals(contributionURL.getProtocol()) && new File(contributionURL.getFile()).isDirectory()) {
+            scanner = new DirectoryContributionScanner();
+        } else {
+            scanner = new JarContributionScanner();
+        }
+        
+        // Scan the contribution and list the artifacts contained in it
+        List<Artifact> artifacts = contribution.getArtifacts();
+        boolean contributionMetadata = false;
+        List<String> artifactURIs = scanner.getArtifacts(contributionURL);
+        for (String artifactURI: artifactURIs) {
+            URL artifactURL = scanner.getArtifactURL(contributionURL, artifactURI);
+
+            // Add the deployed artifact model to the contribution
+            Artifact artifact = this.contributionFactory.createArtifact();
+            artifact.setURI(artifactURI);
+            artifact.setLocation(artifactURL.toString());
+            artifacts.add(artifact);
+            modelResolver.addModel(artifact);
+            
+            // Read each artifact
+            Object model = artifactProcessor.read(contributionURL, URI.create(artifactURI), artifactURL);
+            if (model != null) {
+                artifact.setModel(model);
+
+                // Add the loaded model to the model resolver
+                modelResolver.addModel(model);
+
+                // Merge contribution metadata into the contribution model
+                if (model instanceof ContributionMetadata) {
+                    contributionMetadata = true;
+                    ContributionMetadata c = (ContributionMetadata)model;
+                    contribution.getImports().addAll(c.getImports());
+                    contribution.getExports().addAll(c.getExports());
+                    contribution.getDeployables().addAll(c.getDeployables());
+                }
+            }
+        }
+        
+        // If no sca-contribution.xml file was provided then just consider
+        // all composites in the contribution as deployables
+        if (!contributionMetadata) {
+            for (Artifact artifact: artifacts) {
+                if (artifact.getModel() instanceof Composite) {
+                    contribution.getDeployables().add((Composite)artifact.getModel());
+                }
+            }
+
+            // Add default contribution import and export
+            DefaultImport defaultImport = contributionFactory.createDefaultImport();
+            defaultImport.setModelResolver(new DefaultModelResolver());
+            contribution.getImports().add(defaultImport);
+            DefaultExport defaultExport = contributionFactory.createDefaultExport();
+            contribution.getExports().add(defaultExport);
+        }
+        
+        return contribution;
+    }
+    
+    public void resolve(Contribution contribution, ModelResolver resolver) throws ContributionResolveException {
+        
+        // Resolve the contribution model itself
+        ModelResolver contributionResolver = contribution.getModelResolver();
+        contribution.setUnresolved(false);
+        contributionResolver.addModel(contribution);
+        
+        // Resolve imports and exports
+        for (Export export: contribution.getExports()) {
+            if (export instanceof DefaultExport) {
+                
+                // Initialize the default export's resolver
+                export.setModelResolver(contributionResolver);
+                
+            } else {
+                extensionProcessor.resolve(export, contributionResolver);
+            }
+        }
+        for (Import import_: contribution.getImports()) {
+            extensionProcessor.resolve(import_, contributionResolver);
+        }
+        
+        // Resolve all artifact models
+        for (Artifact artifact : contribution.getArtifacts()) {
+            Object model = artifact.getModel();
+            if (model != null) {
+                try {
+                   artifactProcessor.resolve(model, contributionResolver);
+                } catch (Exception e) {
+                    //FIXME this shouldn't happen
+                }
+            }
+        }
+        
+        // Resolve deployable composites
+        List<Composite> deployables = contribution.getDeployables();
+        for (int i = 0, n = deployables.size(); i < n; i++) {
+            Composite deployable = deployables.get(i);
+            Composite resolved = (Composite)contributionResolver.resolveModel(Composite.class, deployable);
+            if (resolved != deployable) {
+                deployables.set(i, resolved);
+            }
+        }
+    }
+
+    /**
+     * FIXME Temporary hack for testing the ClassLoaderModelResolver.
+     * 
+     * @param modelResolvers
+     */
+    private static void hackResolvers(ModelResolverExtensionPoint modelResolvers) {
+        Class<?> resolverClass = modelResolvers.getResolver(ClassReference.class);
+        if (resolverClass==null || !resolverClass.getName().equals("org.apache.tuscany.sca.contribution.java.impl.ClassLoaderModelResolver")) {
+            try {
+                Class<?> loaderResolverClass = Class.forName("org.apache.tuscany.sca.contribution.java.impl.ClassLoaderModelResolver", true, ContributionContentProcessor.class.getClassLoader());
+                modelResolvers.addResolver(ClassReference.class, (Class<? extends ModelResolver>)loaderResolverClass);
+            } catch (ClassNotFoundException e) {
+            }
+        }
+    }
+}
diff --git a/java/sca/modules/workspace-impl/src/main/java/org/apache/tuscany/sca/workspace/processor/impl/ContributionInfoProcessor.java b/java/sca/modules/workspace-impl/src/main/java/org/apache/tuscany/sca/workspace/processor/impl/ContributionInfoProcessor.java
new file mode 100644
index 0000000000..6ef0fa753d
--- /dev/null
+++ b/java/sca/modules/workspace-impl/src/main/java/org/apache/tuscany/sca/workspace/processor/impl/ContributionInfoProcessor.java
@@ -0,0 +1,225 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.workspace.processor.impl;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.net.URL;
+import java.net.URLConnection;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.ContributionFactory;
+import org.apache.tuscany.sca.contribution.ContributionMetadata;
+import org.apache.tuscany.sca.contribution.DefaultExport;
+import org.apache.tuscany.sca.contribution.DefaultImport;
+import org.apache.tuscany.sca.contribution.Export;
+import org.apache.tuscany.sca.contribution.Import;
+import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
+import org.apache.tuscany.sca.contribution.processor.ExtensibleURLArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessorExtensionPoint;
+import org.apache.tuscany.sca.contribution.resolver.ClassReference;
+import org.apache.tuscany.sca.contribution.resolver.DefaultModelResolver;
+import org.apache.tuscany.sca.contribution.resolver.ExtensibleModelResolver;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolverExtensionPoint;
+import org.apache.tuscany.sca.contribution.scanner.ContributionScanner;
+import org.apache.tuscany.sca.contribution.service.ContributionReadException;
+import org.apache.tuscany.sca.contribution.service.ContributionResolveException;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.workspace.scanner.impl.DirectoryContributionScanner;
+import org.apache.tuscany.sca.workspace.scanner.impl.JarContributionScanner;
+
+/**
+ * URLArtifactProcessor that handles contribution files and returns a contribution
+ * info model.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class ContributionInfoProcessor implements URLArtifactProcessor<Contribution>{
+    private ContributionFactory contributionFactory;
+    private ModelResolverExtensionPoint modelResolvers;
+    private ModelFactoryExtensionPoint modelFactories;
+    private URLArtifactProcessorExtensionPoint artifactProcessors;
+    private URLArtifactProcessor<Object> artifactProcessor;
+    private StAXArtifactProcessor<Object> extensionProcessor;
+
+    public ContributionInfoProcessor(ExtensionPointRegistry extensionPoints, StAXArtifactProcessor<Object> extensionProcessor, Monitor monitor) {
+        this.modelFactories = extensionPoints.getExtensionPoint(ModelFactoryExtensionPoint.class);
+        this.modelResolvers = extensionPoints.getExtensionPoint(ModelResolverExtensionPoint.class);
+        hackResolvers(modelResolvers);
+        URLArtifactProcessorExtensionPoint artifactProcessors = extensionPoints.getExtensionPoint(URLArtifactProcessorExtensionPoint.class);
+        this.artifactProcessors = artifactProcessors;
+        this.artifactProcessor = new ExtensibleURLArtifactProcessor(artifactProcessors, monitor);
+        this.extensionProcessor = extensionProcessor;
+        this.contributionFactory = modelFactories.getFactory(ContributionFactory.class);
+    }
+    
+    public ContributionInfoProcessor(ModelFactoryExtensionPoint modelFactories, ModelResolverExtensionPoint modelResolvers, URLArtifactProcessor<Object> artifactProcessor) {
+        this.modelFactories = modelFactories;
+        this.modelResolvers = modelResolvers;
+        hackResolvers(modelResolvers);
+        this.artifactProcessor = artifactProcessor;
+        this.contributionFactory = modelFactories.getFactory(ContributionFactory.class);
+    }
+    
+    public String getArtifactType() {
+        return ".contribution/info";
+    }
+    
+    public Class<Contribution> getModelType() {
+        return null;
+    }
+    
+    public Contribution read(URL parentURL, URI contributionURI, URL contributionURL) throws ContributionReadException {
+        
+        // Create contribution model
+        Contribution contribution = contributionFactory.createContribution();
+        contribution.setURI(contributionURI.toString());
+        contribution.setLocation(contributionURL.toString());
+        ModelResolver modelResolver = new ExtensibleModelResolver(contribution, modelResolvers, modelFactories);
+        contribution.setModelResolver(modelResolver);
+        contribution.setUnresolved(true);
+
+        // Create a contribution scanner
+        ContributionScanner scanner;
+        if ("file".equals(contributionURL.getProtocol()) && new File(contributionURL.getFile()).isDirectory()) {
+            scanner = new DirectoryContributionScanner();
+        } else {
+            scanner = new JarContributionScanner();
+        }
+        
+        // Read generated and user sca-contribution.xml files
+        boolean contributionMetadata = false;
+        for (String path: new String[]{
+                                       Contribution.SCA_CONTRIBUTION_GENERATED_META,
+                                       Contribution.SCA_CONTRIBUTION_META}) {
+            URL url = scanner.getArtifactURL(contributionURL, path);
+            try {
+                // Check if the file actually exists before trying to read it
+                URLConnection connection = url.openConnection();
+                connection.setUseCaches(false);
+                InputStream is = connection.getInputStream();
+                is.close();
+            } catch (IOException e) {
+                continue;
+            }
+            contributionMetadata = true;
+            
+            // Read the sca-contribution.xml file
+            ContributionMetadata c = (ContributionMetadata)artifactProcessor.read(contributionURL, URI.create(path), url);
+            contribution.getImports().addAll(c.getImports());
+            contribution.getExports().addAll(c.getExports());
+            contribution.getDeployables().addAll(c.getDeployables());
+        }
+        
+        // If no sca-contribution.xml file was provided then consider
+        // all composites in the contribution as deployables, and also
+        // read any files that are explicitly asssigned artifact processors
+        // as they are likely to provide relevant metadata info
+        if (!contributionMetadata) {
+            List<String> artifactURIs;
+            try {
+                artifactURIs = scanner.getArtifacts(contributionURL);
+            } catch (ContributionReadException e) {
+                artifactURIs = null;
+            }
+            if (artifactURIs != null) {
+                for (String artifactURI: artifactURIs) {
+                    boolean read = false;
+                    if (artifactURI.endsWith(".composite")) {
+                        read = true;
+                    } else {
+                        int s= artifactURI.lastIndexOf("/");
+                        String fileName = artifactURI.substring(s + 1);
+                        if (artifactProcessors.getProcessor(fileName) != null) {
+                            read = true;
+                        }
+                    }
+                    if (read) {
+                        URL artifactURL = scanner.getArtifactURL(contributionURL, artifactURI);
+        
+                        // Read each artifact
+                        Object model = artifactProcessor.read(contributionURL, URI.create(artifactURI), artifactURL);
+                        
+                        // In the absence of more info, consider all composites as deployable
+                        if (model instanceof Composite) {
+                            contribution.getDeployables().add((Composite)model);
+                        }
+                    }
+                }
+            }
+            
+            // Add default contribution import and export
+            DefaultImport defaultImport = contributionFactory.createDefaultImport();
+            defaultImport.setModelResolver(new DefaultModelResolver());
+            contribution.getImports().add(defaultImport);
+            DefaultExport defaultExport = contributionFactory.createDefaultExport();
+            contribution.getExports().add(defaultExport);
+        }
+        
+        return contribution;
+    }
+    
+    public void resolve(Contribution contribution, ModelResolver resolver) throws ContributionResolveException {
+        
+        // Mark the contribution model resolved
+        ModelResolver contributionResolver = contribution.getModelResolver();
+        contribution.setUnresolved(false);
+        contributionResolver.addModel(contribution);
+        
+        // Resolve imports and exports
+        for (Export export: contribution.getExports()) {
+            if (export instanceof DefaultExport) {
+                
+                // Initialize the default export's resolver
+                export.setModelResolver(contributionResolver);
+                
+            } else {
+                extensionProcessor.resolve(export, contributionResolver);
+            }
+        }
+        for (Import import_: contribution.getImports()) {
+            extensionProcessor.resolve(import_, contributionResolver);
+        }
+        
+    }
+
+    /**
+     * FIXME Temporary hack for testing the ClassLoaderModelResolver.
+     * 
+     * @param modelResolvers
+     */
+    private static void hackResolvers(ModelResolverExtensionPoint modelResolvers) {
+        Class<?> resolverClass = modelResolvers.getResolver(ClassReference.class);
+        if (resolverClass==null || !resolverClass.getName().equals("org.apache.tuscany.sca.contribution.java.impl.ClassLoaderModelResolver")) {
+            try {
+                Class<?> loaderResolverClass = Class.forName("org.apache.tuscany.sca.contribution.java.impl.ClassLoaderModelResolver", true, ContributionContentProcessor.class.getClassLoader());
+                modelResolvers.addResolver(ClassReference.class, (Class<? extends ModelResolver>)loaderResolverClass);
+            } catch (ClassNotFoundException e) {
+            }
+        }
+    }
+}
diff --git a/java/sca/modules/workspace-impl/src/main/java/org/apache/tuscany/sca/workspace/scanner/impl/DirectoryContributionScanner.java b/java/sca/modules/workspace-impl/src/main/java/org/apache/tuscany/sca/workspace/scanner/impl/DirectoryContributionScanner.java
new file mode 100644
index 0000000000..45ba8c0609
--- /dev/null
+++ b/java/sca/modules/workspace-impl/src/main/java/org/apache/tuscany/sca/workspace/scanner/impl/DirectoryContributionScanner.java
@@ -0,0 +1,107 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.workspace.scanner.impl;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.contribution.scanner.ContributionScanner;
+import org.apache.tuscany.sca.contribution.service.ContributionReadException;
+
+/**
+ * Folder contribution processor.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DirectoryContributionScanner implements ContributionScanner {
+
+    public DirectoryContributionScanner() {
+    }
+
+    public String getContributionType() {
+        return "application/vnd.tuscany.folder";
+    }
+
+    public URL getArtifactURL(URL contributionURL, String artifact) throws ContributionReadException {
+        File directory = directory(contributionURL);
+        File file = new File(directory, artifact);
+        try {
+            return file.toURI().toURL();
+        } catch (MalformedURLException e) {
+            throw new ContributionReadException(e);
+        }
+    }
+
+    public List<String> getArtifacts(URL contributionURL) throws ContributionReadException {
+        File directory = directory(contributionURL);
+        List<String> artifacts = new ArrayList<String>();
+        try {
+            traverse(artifacts, directory, directory);
+        } catch (IOException e) {
+            throw new ContributionReadException(e);
+        }
+        return artifacts;
+    }
+
+    /**
+     * Recursively traverse a root directory
+     * 
+     * @param fileList
+     * @param file
+     * @param root
+     * @throws IOException
+     */
+    private static void traverse(List<String> fileList, File file, File root) throws IOException {
+        if (file.isFile()) {
+            fileList.add(root.toURI().relativize(file.toURI()).toString());
+        } else if (file.isDirectory()) {
+            String uri = root.toURI().relativize(file.toURI()).toString();
+            if (uri.endsWith("/")) {
+                uri = uri.substring(0, uri.length() - 1);
+            }
+            fileList.add(uri);
+            
+            File[] files = file.listFiles();
+            for (File f: files) {
+                if (!f.getName().startsWith(".")) {
+                    traverse(fileList, f, root);
+                }
+            }
+        }
+    }
+
+    private static File directory(URL url) throws ContributionReadException {
+        File file;
+        try {
+            file = new File(url.toURI());
+        } catch (URISyntaxException e) {
+            throw new ContributionReadException(e);
+        }
+        if (!file.exists() || !file.isDirectory()) {
+            throw new ContributionReadException(url.toString());
+        }
+        return file;
+    }
+}
diff --git a/java/sca/modules/workspace-impl/src/main/java/org/apache/tuscany/sca/workspace/scanner/impl/JarContributionScanner.java b/java/sca/modules/workspace-impl/src/main/java/org/apache/tuscany/sca/workspace/scanner/impl/JarContributionScanner.java
new file mode 100644
index 0000000000..9dd1b3a15b
--- /dev/null
+++ b/java/sca/modules/workspace-impl/src/main/java/org/apache/tuscany/sca/workspace/scanner/impl/JarContributionScanner.java
@@ -0,0 +1,121 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.workspace.scanner.impl;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLConnection;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.jar.JarEntry;
+import java.util.jar.JarInputStream;
+
+import org.apache.tuscany.sca.contribution.scanner.ContributionScanner;
+import org.apache.tuscany.sca.contribution.service.ContributionReadException;
+
+/**
+ * JAR Contribution processor.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class JarContributionScanner implements ContributionScanner {
+
+    public JarContributionScanner() {
+    }
+
+    public String getContributionType() {
+        return "application/x-compressed";
+    }
+
+    public URL getArtifactURL(URL contributionURL, String artifact) throws ContributionReadException {
+        try {
+            URL url;
+            if (contributionURL.toString().startsWith("jar:")) {
+                url = new URL(contributionURL, artifact.toString());
+            } else {
+                url = new URL("jar:" + contributionURL.toExternalForm() + "!/" + artifact);
+            }
+            return url;
+        } catch (MalformedURLException e) {
+            throw new ContributionReadException(e);
+        }
+    }
+
+    public List<String> getArtifacts(URL contributionURL) throws ContributionReadException {
+
+        // Assume the URL references a JAR file
+        try {
+            URLConnection connection = contributionURL.openConnection();
+            connection.setUseCaches(false);
+            JarInputStream jar = new JarInputStream(connection.getInputStream());
+            try {
+                Set<String> names = new HashSet<String>();
+                while (true) {
+                    JarEntry entry = jar.getNextJarEntry();
+                    if (entry == null) {
+                        // EOF
+                        break;
+                    }
+
+                    String name = entry.getName(); 
+                    if (name.length() != 0 && !name.startsWith(".")) {
+                        
+                        // Trim trailing /
+                        if (name.endsWith("/")) {
+                            name = name.substring(0, name.length() - 1);
+                        }
+
+                        // Add the entry name
+                        if (!names.contains(name)) {
+                            names.add(name);
+                            
+                            // Add parent folder names to the list too
+                            for (;;) {
+                                int s = name.lastIndexOf('/');
+                                if (s == -1) {
+                                    name = "";
+                                } else {
+                                    name = name.substring(0, s);
+                                }
+                                if (name.length() != 0 && !names.contains(name)) {
+                                    names.add(name);
+                                } else {
+                                    break;
+                                }
+                            }
+                        }
+                    }
+                }
+                
+                // Return list of URIs
+                List<String> artifacts = new ArrayList<String>(names);
+                return artifacts;
+                
+            } finally {
+                jar.close();
+            }
+        } catch (IOException e) {
+            throw new ContributionReadException(e);
+        }
+    }
+}
diff --git a/java/sca/modules/workspace-impl/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor b/java/sca/modules/workspace-impl/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor
new file mode 100644
index 0000000000..41d0ebe27d
--- /dev/null
+++ b/java/sca/modules/workspace-impl/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor
@@ -0,0 +1,20 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License. 
+
+# Implementation class for the artifact processor extension
+org.apache.tuscany.sca.workspace.processor.impl.ContributionContentProcessor;type=.contribution/content,model=org.apache.tuscany.sca.contribution.Contribution
+org.apache.tuscany.sca.workspace.processor.impl.ContributionInfoProcessor;type=.contribution/info
diff --git a/java/sca/modules/workspace-impl/src/main/resources/workspace-validation-messages.properties b/java/sca/modules/workspace-impl/src/main/resources/workspace-validation-messages.properties
new file mode 100644
index 0000000000..0c07a3a30f
--- /dev/null
+++ b/java/sca/modules/workspace-impl/src/main/resources/workspace-validation-messages.properties
@@ -0,0 +1,22 @@
+#
+#
+#    Licensed to the Apache Software Foundation (ASF) under one
+#    or more contributor license agreements. See the NOTICE file
+#    distributed with this work for additional information
+#    regarding copyright ownership. The ASF licenses this file
+#    to you under the Apache License, Version 2.0 (the
+#    "License"); you may not use this file except in compliance
+#    with the License. You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing,
+#    software distributed under the License is distributed on an
+#    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#    KIND, either express or implied. See the License for the
+#    specific language governing permissions and limitations
+#    under the License.
+#
+#
+
+UnresolvedImport = Unresolved import: Import = {0}
diff --git a/java/sca/modules/workspace-impl/src/main/resources/workspace-validation-messages_it.properties b/java/sca/modules/workspace-impl/src/main/resources/workspace-validation-messages_it.properties
new file mode 100644
index 0000000000..2e8326c062
--- /dev/null
+++ b/java/sca/modules/workspace-impl/src/main/resources/workspace-validation-messages_it.properties
@@ -0,0 +1,21 @@
+#
+#
+#    Licensed to the Apache Software Foundation (ASF) under one
+#    or more contributor license agreements. See the NOTICE file
+#    distributed with this work for additional information
+#    regarding copyright ownership. The ASF licenses this file
+#    to you under the Apache License, Version 2.0 (the
+#    "License"); you may not use this file except in compliance
+#    with the License. You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing,
+#    software distributed under the License is distributed on an
+#    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#    KIND, either express or implied. See the License for the
+#    specific language governing permissions and limitations
+#    under the License.
+#
+#
+