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The Adobe Experience Manager SDK

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/*
 * 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.cocoon.xml.sax;

import org.xml.sax.ContentHandler;
import org.xml.sax.ext.LexicalHandler;
import org.xml.sax.helpers.DefaultHandler;

/**
 *  This abstract class provides utility methods to implement a producer
 *  for SAX events..
 *
 *  @version $Id: AbstractSAXProducer.java 729283 2008-12-24 09:25:21Z cziegeler $
 *
 * @deprecated This API is deprecated, migrate code to the XML APIs provided by the JDK.
 */
@Deprecated(since = "2022-01-27")
public abstract class AbstractSAXProducer {

    /**
     * Empty, do-nothing content handler
     */
    protected static final ContentHandler EMPTY_CONTENT_HANDLER = new DefaultHandler();

    /**
     * The ContentHandler receiving SAX events.
     */
    protected ContentHandler contentHandler = EMPTY_CONTENT_HANDLER;

    /**
     * The LexicalHandler receiving SAX events.
     */
    protected LexicalHandler lexicalHandler = DefaultLexicalHandler.NULL_HANDLER;

    /**
     * Set the ContentHandler that will receive XML data.
     *
     * Subclasses may retrieve this ContentHandler instance
     * accessing the protected super.contentHandler field.
     *
     * @param handler content handler, should never be null.
     */
    public void setContentHandler(ContentHandler handler) {
        this.contentHandler = handler;
        if (handler instanceof LexicalHandler) {
            this.lexicalHandler = (LexicalHandler) handler;
        } else {
            this.lexicalHandler = DefaultLexicalHandler.NULL_HANDLER;
        }
    }

    /**
     * Recycle the producer by removing references, and resetting handlers to
     * null (empty) implementations.
     */
    public void recycle() {
        this.contentHandler = EMPTY_CONTENT_HANDLER;
        this.lexicalHandler = DefaultLexicalHandler.NULL_HANDLER;
    }
}