/*

  * Copyright 2004-2008 the Seasar Foundation and the Others.

  *

  * Licensed 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.seasar.uruma.rcp.configuration;

 import java.io.ByteArrayInputStream;

 import java.io.StringWriter;

 import java.io.UnsupportedEncodingException;

 import java.util.ArrayList;

 import java.util.List;

 import org.eclipse.core.internal.registry.ExtensionRegistry;

 import org.eclipse.core.runtime.IContributor;

 import org.eclipse.core.runtime.IExtensionRegistry;

 import org.eclipse.core.runtime.Platform;

 import org.osgi.framework.Bundle;

 import org.seasar.uruma.core.UrumaMessageCodes;

 import org.seasar.uruma.log.UrumaLogger;

 import org.seasar.uruma.rcp.configuration.extension.MenusBuilder;

 import org.seasar.uruma.rcp.configuration.extension.PerspectivesBuilder;

 import org.seasar.uruma.rcp.configuration.extension.ViewsBuilder;

 /**

  * {@link Bundle} に対してコントリビューションを動的に追加するためのクラスです。<br />

  * 

  * @author y-komori

  */

 public class ContributionBuilder {

     private static final int BUFFER_SIZE = 4096;

     private static final UrumaLogger logger = UrumaLogger

             .getLogger(ContributionBuilder.class);

     private static final List<ExtensionBuilder> builders = new ArrayList<ExtensionBuilder>();

     private static String content;

     static {

         builders.add(new MenusBuilder());

         builders.add(new ViewsBuilder());

         builders.add(new PerspectivesBuilder());

     }

     private ContributionBuilder() {

     }

     /**

      * コントリビューションをビルドして追加します。<br />

      * 

      * @param contributor

      *            コントリビュート対象の {@link IContributor} オブジェクト

      * @param extensions

      *            ビルド対象の {@link Extension} オブジェクトのリスト

      */

     public static void build(final IContributor contributor,

             final List<Extension> extensions) {

         buildExtensions(extensions);

         IExtensionRegistry registry = Platform.getExtensionRegistry();

         StringWriter writer = new StringWriter(BUFFER_SIZE);

         writer.write("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");

         writer.write("<?eclipse version=\"3.2\"?>\n");

         writer.write("<plugin>\n");

         for (Extension extension : extensions) {

             extension.setLevel(1);

             extension.writeConfiguration(writer);

         }

         writer.write("</plugin>\n");

         content = writer.getBuffer().toString();

         if (logger.isTraceEnabled()) {

             logger.log(UrumaMessageCodes.CREATE_CONTRIBUTION, content);

         }

         ByteArrayInputStream is = null;

         try {

             is = new ByteArrayInputStream(content.getBytes("UTF-8"));

         } catch (UnsupportedEncodingException ignore) {

         }

         Object token = ((ExtensionRegistry) registry).getTemporaryUserToken();

         registry.addContribution(is, contributor, false, null, null, token);

     }

     protected static void buildExtensions(final List<Extension> extensions) {

         for (ExtensionBuilder builder : builders) {

             Extension[] extensionArray = builder.buildExtension();

             for (Extension extension : extensionArray) {

                 extensions.add(extension);

             }

         }

     }

     /**

      * コントリビューションとして作成したXMLを返却します。<br />

      * 

      * @return コントリビューションXML

      */

     public static String getContent() {

         return content;

     }

 }