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Diffstat (limited to '')
-rw-r--r-- | sca-java-2.x/branches/2.0-Beta1/modules/databinding/src/main/java/org/apache/tuscany/sca/databinding/DefaultTransformerExtensionPoint.java | 321 |
1 files changed, 0 insertions, 321 deletions
diff --git a/sca-java-2.x/branches/2.0-Beta1/modules/databinding/src/main/java/org/apache/tuscany/sca/databinding/DefaultTransformerExtensionPoint.java b/sca-java-2.x/branches/2.0-Beta1/modules/databinding/src/main/java/org/apache/tuscany/sca/databinding/DefaultTransformerExtensionPoint.java deleted file mode 100644 index 39889b1e97..0000000000 --- a/sca-java-2.x/branches/2.0-Beta1/modules/databinding/src/main/java/org/apache/tuscany/sca/databinding/DefaultTransformerExtensionPoint.java +++ /dev/null @@ -1,321 +0,0 @@ -/* - * 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.databinding; - -import java.io.IOException; -import java.lang.reflect.Constructor; -import java.util.ArrayList; -import java.util.Collection; -import java.util.List; -import java.util.Map; -import java.util.logging.Level; -import java.util.logging.Logger; - -import org.apache.tuscany.sca.core.ExtensionPointRegistry; -import org.apache.tuscany.sca.databinding.impl.DirectedGraph; -import org.apache.tuscany.sca.extensibility.ServiceDeclaration; -import org.apache.tuscany.sca.extensibility.ServiceDiscovery; - -/** - * @version $Rev$ $Date$ - */ -public class DefaultTransformerExtensionPoint implements TransformerExtensionPoint { - private static final Logger logger = Logger.getLogger(DefaultTransformerExtensionPoint.class.getName()); - private boolean loadedTransformers; - - private ExtensionPointRegistry registry; - private final DirectedGraph<Object, Transformer> graph = new DirectedGraph<Object, Transformer>(); - - public DefaultTransformerExtensionPoint(ExtensionPointRegistry registry) { - this.registry = registry; - } - - public void addTransformer(String sourceType, String resultType, int weight, Transformer transformer, boolean publicTransformer) { - if (logger.isLoggable(Level.FINE)) { - String className = transformer.getClass().getName(); - boolean lazy = false; - boolean pull = (transformer instanceof PullTransformer); - if (transformer instanceof LazyPullTransformer) { - className = ((LazyPullTransformer)transformer).transformerDeclaration.getClassName(); - lazy = true; - } - if (transformer instanceof LazyPushTransformer) { - className = ((LazyPushTransformer)transformer).transformerDeclaration.getClassName(); - lazy = true; - } - - logger.fine("Adding transformer: " + className - + ";source=" - + sourceType - + ",target=" - + resultType - + ",weight=" - + weight - + ",type=" - + (pull ? "pull" : "push") - + ",lazy=" - + lazy); - } - graph.addEdge(sourceType, resultType, transformer, weight, publicTransformer); - } - - public void addTransformer(Transformer transformer, boolean publicTransformer) { - addTransformer(transformer.getSourceDataBinding(), - transformer.getTargetDataBinding(), - transformer.getWeight(), - transformer, publicTransformer); - } - - public boolean removeTransformer(String sourceType, String resultType) { - return graph.removeEdge(sourceType, resultType); - } - - public Transformer getTransformer(String sourceType, String resultType) { - loadTransformers(); - - DirectedGraph<Object, Transformer>.Edge edge = graph.getEdge(sourceType, resultType); - return (edge == null) ? null : edge.getValue(); - } - - /** - * Dynamically load transformers registered under META-INF/services. - * - */ - private synchronized void loadTransformers() { - if (loadedTransformers) { - return; - } - loadedTransformers = true; - loadTransformers(PullTransformer.class); - loadTransformers(PushTransformer.class); - - } - - /** - * Dynamically load transformers registered under META-INF/services. - * - * @param transformerClass - */ - private synchronized void loadTransformers(Class<?> transformerClass) { - - // Get the transformer service declarations - Collection<ServiceDeclaration> transformerDeclarations; - - try { - transformerDeclarations = registry.getServiceDiscovery().getServiceDeclarations(transformerClass.getName()); - - } catch (IOException e) { - throw new IllegalStateException(e); - } - - // Load transformers - for (ServiceDeclaration transformerDeclaration : transformerDeclarations) { - Map<String, String> attributes = transformerDeclaration.getAttributes(); - - String source = attributes.get("source"); - String target = attributes.get("target"); - int weight = Integer.valueOf(attributes.get("weight")); - String b = attributes.get("public"); - boolean pub = true; - if (b != null) { - pub = Boolean.valueOf(b); - } - - // Create a transformer wrapper and register it - Transformer transformer; - if (transformerClass == PullTransformer.class) { - transformer = new LazyPullTransformer(source, target, weight, transformerDeclaration); - } else { - transformer = new LazyPushTransformer(source, target, weight, transformerDeclaration); - } - addTransformer(transformer, pub); - } - } - - /** - * A transformer facade allowing transformers to be lazily loaded - * and initialized. - */ - private class LazyPullTransformer implements PullTransformer<Object, Object> { - - private String source; - private String target; - private int weight; - private ServiceDeclaration transformerDeclaration; - private PullTransformer<Object, Object> transformer; - - public LazyPullTransformer(String source, String target, int weight, ServiceDeclaration transformerDeclaration) { - this.source = source; - this.target = target; - this.weight = weight; - this.transformerDeclaration = transformerDeclaration; - } - - /** - * Load and instantiate the transformer class. - * - * @return The transformer. - */ - @SuppressWarnings("unchecked") - private PullTransformer<Object, Object> getTransformer() { - if (transformer == null) { - try { - Class<PullTransformer<Object, Object>> transformerClass = - (Class<PullTransformer<Object, Object>>)transformerDeclaration.loadClass(); - try { - Constructor<PullTransformer<Object, Object>> constructor = transformerClass.getConstructor(); - transformer = constructor.newInstance(); - } catch (NoSuchMethodException e) { - Constructor<PullTransformer<Object, Object>> constructor = - transformerClass.getConstructor(ExtensionPointRegistry.class); - transformer = constructor.newInstance(registry); - } - } catch (Exception e) { - throw new IllegalStateException(e); - } - } - return transformer; - } - - public String getSourceDataBinding() { - return source; - } - - public String getTargetDataBinding() { - return target; - } - - public int getWeight() { - return weight; - } - - public Object transform(Object source, TransformationContext context) { - return getTransformer().transform(source, context); - } - - @Override - public String toString() { - StringBuffer sb = new StringBuffer(super.toString()); - sb.append(";className=").append(transformerDeclaration.getClassName()); - return sb.toString(); - } - } - - /** - * A transformer facade allowing transformers to be lazily loaded - * and initialized. - */ - private class LazyPushTransformer implements PushTransformer<Object, Object> { - - private String source; - private String target; - private int weight; - private ServiceDeclaration transformerDeclaration; - private PushTransformer<Object, Object> transformer; - - public LazyPushTransformer(String source, String target, int weight, ServiceDeclaration transformerDeclaration) { - this.source = source; - this.target = target; - this.weight = weight; - this.transformerDeclaration = transformerDeclaration; - } - - /** - * Load and instantiate the transformer class. - * - * @return The transformer. - */ - @SuppressWarnings("unchecked") - private PushTransformer<Object, Object> getTransformer() { - if (transformer == null) { - try { - Class<PushTransformer<Object, Object>> transformerClass = - (Class<PushTransformer<Object, Object>>)transformerDeclaration.loadClass(); - try { - Constructor<PushTransformer<Object, Object>> constructor = transformerClass.getConstructor(); - transformer = constructor.newInstance(); - } catch (NoSuchMethodException e) { - Constructor<PushTransformer<Object, Object>> constructor = - transformerClass.getConstructor(ExtensionPointRegistry.class); - transformer = constructor.newInstance(registry); - } - } catch (Exception e) { - throw new IllegalStateException(e); - } - } - return transformer; - } - - public String getSourceDataBinding() { - return source; - } - - public String getTargetDataBinding() { - return target; - } - - public int getWeight() { - return weight; - } - - public void transform(Object source, Object sink, TransformationContext context) { - getTransformer().transform(source, sink, context); - } - - @Override - public String toString() { - StringBuffer sb = new StringBuffer(super.toString()); - sb.append(";className=").append(transformerDeclaration.getClassName()); - return sb.toString(); - } - } - - //FIXME The following methods should be on a different class from - // extension point - - public List<Transformer> getTransformerChain(String sourceType, String resultType) { - loadTransformers(); - - String source = sourceType; - String result = resultType; - List<Transformer> transformers = new ArrayList<Transformer>(); - // First check if there is a direct path, if yes, use it regardless of the weight - DirectedGraph<Object, Transformer>.Edge link = graph.getEdge(sourceType, resultType); - if (link != null) { - transformers.add(link.getValue()); - } else { - DirectedGraph<Object, Transformer>.Path path = graph.getShortestPath(source, result); - if (path == null) { - return null; - } - for (DirectedGraph<Object, Transformer>.Edge edge : path.getEdges()) { - transformers.add(edge.getValue()); - } - } - return transformers; - } - - @Override - public String toString() { - loadTransformers(); - - return graph.toString(); - } - -} |