/*
 * Copyright 2001-2004 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 javax.xml.transform.sax;

import javax.xml.transform.*;

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


/**
 * Acts as an holder for a transformation Result.
 */
public class SAXResult implements Result {

    /**
     * If {@link javax.xml.transform.TransformerFactory#getFeature}
     * returns true when passed this value as an argument,
     * the Transformer supports Result output of this type.
     */
    public static final String FEATURE =
        "http://javax.xml.transform.sax.SAXResult/feature";

    /**
     * Zero-argument default constructor.
     */
    public SAXResult() {}

    /**
     * Create a SAXResult that targets a SAX2 {@link org.xml.sax.ContentHandler}.
     *
     * @param handler Must be a non-null ContentHandler reference.
     */
    public SAXResult(ContentHandler handler) {
        setHandler(handler);
    }

    /**
     * Set the target to be a SAX2 {@link org.xml.sax.ContentHandler}.
     *
     * @param handler Must be a non-null ContentHandler reference.
     */
    public void setHandler(ContentHandler handler) {
        this.handler = handler;
    }

    /**
     * Get the {@link org.xml.sax.ContentHandler} that is the Result.
     *
     * @return The ContentHandler that is to be transformation output.
     */
    public ContentHandler getHandler() {
        return handler;
    }

    /**
     * Set the SAX2 {@link org.xml.sax.ext.LexicalHandler} for the output.
     *
     * <p>This is needed to handle XML comments and the like.  If the
     * lexical handler is not set, an attempt should be made by the
     * transformer to cast the {@link org.xml.sax.ContentHandler} to a
     * <code>LexicalHandler</code>.</p>
     *
     * @param handler A non-null <code>LexicalHandler</code> for
     * handling lexical parse events.
     */
    public void setLexicalHandler(LexicalHandler handler) {
        this.lexhandler = handler;
    }

    /**
     * Get a SAX2 {@link org.xml.sax.ext.LexicalHandler} for the output.
     *
     * @return A <code>LexicalHandler</code>, or null.
     */
    public LexicalHandler getLexicalHandler() {
        return lexhandler;
    }

    /**
     * Method setSystemId Set the systemID that may be used in association
     * with the {@link org.xml.sax.ContentHandler}.
     *
     * @param systemId The system identifier as a URI string.
     */
    public void setSystemId(String systemId) {
        this.systemId = systemId;
    }

    /**
     * Get the system identifier that was set with setSystemId.
     *
     * @return The system identifier that was set with setSystemId, or null
     * if setSystemId was not called.
     */
    public String getSystemId() {
        return systemId;
    }

    //////////////////////////////////////////////////////////////////////
    // Internal state.
    //////////////////////////////////////////////////////////////////////

    /**
     * The handler for parse events.
     */
    private ContentHandler handler;

    /**
     * The handler for lexical events.
     */
    private LexicalHandler lexhandler;

    /**
     * The systemID that may be used in association
     * with the node.
     */
    private String systemId;
}
