/*

  * 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.any23.writer;

 import org.apache.any23.extractor.ExtractionContext;

 import org.openrdf.model.Resource;

 import org.openrdf.model.URI;

 import org.openrdf.model.Value;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.Collections;

 /**

  * A {@link TripleHandler} multi decorator, that wraps zero or more

  * other triple handlers and dispatches all events to each of them.

  *

  * @author Richard Cyganiak (richard@cyganiak.de)

  */

 public class CompositeTripleHandler implements TripleHandler {

     private Collection<TripleHandler> children = new ArrayList<TripleHandler>();

     /**

      * Constructor with empty decorated list.

      */

     public CompositeTripleHandler() {

         this(Collections.<TripleHandler>emptyList());

     }

     /**

      * Constructor with initial list of decorated handlers.

      * 

      * @param children list of decorated handlers. 

      */

     public CompositeTripleHandler(Collection<TripleHandler> children) {

         this.children.addAll(children);

     }

     /**

      * Adds a decorated handler.

      *

      * @param child the decorated handler.

      */

     public void addChild(TripleHandler child) {

         children.add(child);

     }

     public Collection<TripleHandler> getChilds() {

         return children;

     }

     public void startDocument(URI documentURI) throws TripleHandlerException {

         for (TripleHandler handler : children) {

             handler.startDocument(documentURI);

         }

     }

     public void openContext(ExtractionContext context) throws TripleHandlerException {

         for (TripleHandler handler : children) {

             handler.openContext(context);

         }

     }

     public void closeContext(ExtractionContext context) throws TripleHandlerException {

         for (TripleHandler handler : children) {

             handler.closeContext(context);

         }

     }

     public void receiveTriple(Resource s, URI p, Value o, URI g, ExtractionContext context)

     throws TripleHandlerException {

         for (TripleHandler handler : children) {

             handler.receiveTriple(s, p, o, g, context);

         }

     }

     public void receiveNamespace(String prefix, String uri, ExtractionContext context)

     throws TripleHandlerException {

         for (TripleHandler handler : children) {

             handler.receiveNamespace(prefix, uri, context);

         }

     }

     public void close() throws TripleHandlerException {

         for (TripleHandler handler : children) {

             handler.close();

         }

     }

     public void endDocument(URI documentURI) throws TripleHandlerException {

         for (TripleHandler handler : children) {

             handler.endDocument(documentURI);

         }

     }

     public void setContentLength(long contentLength) {

         // Empty.

     }

 }