| /* |
| * Copyright 1999-2004 The Apache Software Foundation. |
| * |
| * 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.apache.cocoon.xml; |
| |
| import org.apache.avalon.excalibur.pool.Recyclable; |
| import org.apache.avalon.framework.logger.AbstractLogEnabled; |
| import org.xml.sax.ContentHandler; |
| import org.xml.sax.ext.LexicalHandler; |
| import org.xml.sax.helpers.DefaultHandler; |
| |
| /** |
| * This abstract class provides default implementation of the methods specified |
| * by the <code>XMLProducer</code> interface. |
| * |
| * @version $Id$ |
| */ |
| public abstract class AbstractXMLProducer extends AbstractLogEnabled |
| implements XMLProducer, Recyclable { |
| |
| protected static final ContentHandler EMPTY_CONTENT_HANDLER = new DefaultHandler(); |
| |
| /** The <code>XMLConsumer</code> receiving SAX events. */ |
| protected XMLConsumer xmlConsumer; |
| |
| /** The <code>ContentHandler</code> receiving SAX events. */ |
| protected ContentHandler contentHandler = EMPTY_CONTENT_HANDLER; |
| |
| /** The <code>LexicalHandler</code> receiving SAX events. */ |
| protected LexicalHandler lexicalHandler = DefaultLexicalHandler.NULL_HANDLER; |
| |
| /** |
| * Set the <code>XMLConsumer</code> that will receive XML data. |
| * <br> |
| * This method will simply call <code>setContentHandler(consumer)</code> |
| * and <code>setLexicalHandler(consumer)</code>. |
| */ |
| public void setConsumer(XMLConsumer consumer) { |
| this.xmlConsumer = consumer; |
| setContentHandler(consumer); |
| setLexicalHandler(consumer); |
| } |
| |
| /** |
| * Set the <code>ContentHandler</code> that will receive XML data. |
| * <br> |
| * Subclasses may retrieve this <code>ContentHandler</code> instance |
| * accessing the protected <code>super.contentHandler</code> field. |
| */ |
| public void setContentHandler(ContentHandler handler) { |
| this.contentHandler = handler; |
| } |
| |
| /** |
| * Set the <code>LexicalHandler</code> that will receive XML data. |
| * <br> |
| * Subclasses may retrieve this <code>LexicalHandler</code> instance |
| * accessing the protected <code>super.lexicalHandler</code> field. |
| */ |
| public void setLexicalHandler(LexicalHandler handler) { |
| this.lexicalHandler = handler; |
| } |
| |
| /** |
| * Recycle the producer by removing references, and resetting handlers to |
| * null (empty) implementations. |
| */ |
| public void recycle() { |
| this.xmlConsumer = null; |
| this.contentHandler = EMPTY_CONTENT_HANDLER; |
| this.lexicalHandler = DefaultLexicalHandler.NULL_HANDLER; |
| } |
| } |