From bdd0a41aed7edf21ec2a65cfa17a86af2ef8c48a Mon Sep 17 00:00:00 2001
From: dims <dims@13f79535-47bb-0310-9956-ffa450edef68>
Date: Tue, 17 Jun 2008 00:23:01 +0000
Subject: Move Tuscany from Incubator to top level.

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@668359 13f79535-47bb-0310-9956-ffa450edef68
---
 .../DefaultContributionScannerExtensionPoint.java  | 125 +++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 sandbox/axis2-1.4/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/DefaultContributionScannerExtensionPoint.java

(limited to 'sandbox/axis2-1.4/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/DefaultContributionScannerExtensionPoint.java')

diff --git a/sandbox/axis2-1.4/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/DefaultContributionScannerExtensionPoint.java b/sandbox/axis2-1.4/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/DefaultContributionScannerExtensionPoint.java
new file mode 100644
index 0000000000..24aae45b59
--- /dev/null
+++ b/sandbox/axis2-1.4/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/scanner/DefaultContributionScannerExtensionPoint.java
@@ -0,0 +1,125 @@
+/*
+ * 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.contribution.scanner;
+
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.net.URL;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.tuscany.sca.contribution.service.ContributionReadException;
+import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
+import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
+
+/**
+ * Default implementation of a contribution scanner extension point.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DefaultContributionScannerExtensionPoint implements ContributionScannerExtensionPoint {
+
+    private Map<String, ContributionScanner> scanners = new HashMap<String, ContributionScanner>();
+    private boolean loaded;
+
+    public DefaultContributionScannerExtensionPoint() {
+    }
+
+    public void addContributionScanner(ContributionScanner scanner) {
+        scanners.put(scanner.getContributionType(), scanner);
+    }
+
+    public void removeContributionScanner(ContributionScanner scanner) {
+        scanners.remove(scanner.getContributionType());
+    }
+
+    public ContributionScanner getContributionScanner(String contentType) {
+        loadScanners();
+        return scanners.get(contentType);
+    }
+
+    private void loadScanners() {
+        if (loaded)
+            return;
+
+        // Get the scanner service declarations
+        Set<ServiceDeclaration> scannerDeclarations; 
+        try {
+            scannerDeclarations = ServiceDiscovery.getInstance().getServiceDeclarations(ContributionScanner.class);
+        } catch (IOException e) {
+            throw new IllegalStateException(e);
+        }
+        
+        for (ServiceDeclaration scannerDeclaration: scannerDeclarations) {
+            Map<String, String> attributes = scannerDeclaration.getAttributes();
+            
+            // Load a URL artifact scanner
+            String contributionType = attributes.get("type");
+            
+            // Create a scanner wrapper and register it
+            ContributionScanner scanner = new LazyContributionScanner(contributionType, scannerDeclaration);
+            addContributionScanner(scanner);
+        }
+        
+        loaded = true;
+    }
+
+    /**
+     * A facade for contribution scanners.
+     */
+    private static class LazyContributionScanner implements ContributionScanner {
+        
+        private ServiceDeclaration scannerDeclaration;
+        private String contributionType;
+        private ContributionScanner scanner;
+        
+        private LazyContributionScanner(String contributionType, ServiceDeclaration scannerDeclaration) {
+            this.scannerDeclaration = scannerDeclaration;
+            this.contributionType = contributionType;
+        }
+
+        public URL getArtifactURL(URL contributionSourceURL, String artifact) throws ContributionReadException {
+            return getScanner().getArtifactURL(contributionSourceURL, artifact);
+        }
+
+        public List<String> getArtifacts(URL contributionSourceURL) throws ContributionReadException {
+            return getScanner().getArtifacts(contributionSourceURL);
+        }
+
+        public String getContributionType() {
+            return contributionType;
+        }
+        
+        private ContributionScanner getScanner() {
+            if (scanner == null) {
+                try {
+                    Class<ContributionScanner> scannerClass = (Class<ContributionScanner>)scannerDeclaration.loadClass();
+                    Constructor<ContributionScanner> constructor = scannerClass.getConstructor();
+                    scanner = constructor.newInstance();
+                } catch (Exception e) {
+                    throw new IllegalStateException(e);
+                }
+            }
+            return scanner;
+        }
+    }
+}
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