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/*
 * Copyright 2000-2005 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package javax.xml.transform.stream;

import javax.xml.transform.Result;

import java.io.File;
import java.io.OutputStream;
import java.io.Writer;
import java.net.MalformedURLException;

/**
 * <p>Acts as an holder for a transformation result,
 * which may be XML, plain Text, HTML, or some other form of markup.</p>
 *
 * @author <a href="Jeff.Suttor@Sun.com">Jeff Suttor</a>
 */
public class StreamResult 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.stream.StreamResult/feature";

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

    /**
     * Construct a StreamResult from a byte stream.  Normally,
     * a stream should be used rather than a reader, so that
     * the transformer may use instructions contained in the
     * transformation instructions to control the encoding.
     *
     * @param outputStream A valid OutputStream reference.
     */
    public StreamResult(OutputStream outputStream) {
        setOutputStream(outputStream);
    }

    /**
     * Construct a StreamResult from a character stream.  Normally,
     * a stream should be used rather than a reader, so that
     * the transformer may use instructions contained in the
     * transformation instructions to control the encoding.  However,
     * there are times when it is useful to write to a character
     * stream, such as when using a StringWriter.
     *
     * @param writer  A valid Writer reference.
     */
    public StreamResult(Writer writer) {
        setWriter(writer);
    }

    /**
     * Construct a StreamResult from a URL.
     *
     * @param systemId Must be a String that conforms to the URI syntax.
     */
    public StreamResult(String systemId) {
        this.systemId = systemId;
    }

    /**
     * Construct a StreamResult from a File.
     *
     * @param f Must a non-null File reference.
     */
    public StreamResult(File f) {
        //convert file to appropriate URI, f.toURI().toASCIIString() 
        //converts the URI to string as per rule specified in
        //RFC 2396,
        setSystemId(f.toURI().toASCIIString());
    }

    /**
     * Set the ByteStream that is to be written to.  Normally,
     * a stream should be used rather than a reader, so that
     * the transformer may use instructions contained in the
     * transformation instructions to control the encoding.
     *
     * @param outputStream A valid OutputStream reference.
     */
    public void setOutputStream(OutputStream outputStream) {
        this.outputStream = outputStream;
    }

    /**
     * Get the byte stream that was set with setOutputStream.
     *
     * @return The byte stream that was set with setOutputStream, or null
     * if setOutputStream or the ByteStream constructor was not called.
     */
    public OutputStream getOutputStream() {
        return outputStream;
    }

    /**
     * Set the writer that is to receive the result.  Normally,
     * a stream should be used rather than a writer, so that
     * the transformer may use instructions contained in the
     * transformation instructions to control the encoding.  However,
     * there are times when it is useful to write to a writer,
     * such as when using a StringWriter.
     *
     * @param writer  A valid Writer reference.
     */
    public void setWriter(Writer writer) {
        this.writer = writer;
    }

    /**
     * Get the character stream that was set with setWriter.
     *
     * @return The character stream that was set with setWriter, or null
     * if setWriter or the Writer constructor was not called.
     */
    public Writer getWriter() {
        return writer;
    }

    /**
     * Set the systemID that may be used in association
     * with the byte or character stream, or, if neither is set, use
     * this value as a writeable URI (probably a file name).
     *
     * @param systemId The system identifier as a URI string.
     */
    public void setSystemId(String systemId) {
        this.systemId = systemId;
    }

    /**
     * <p>Set the system ID from a <code>File</code> reference.</p>
     * 
     *
     * @param f Must a non-null File reference.
     */
    public void setSystemId(File f) {
      //convert file to appropriate URI, f.toURI().toASCIIString() 
        //converts the URI to string as per rule specified in
        //RFC 2396,
        this.systemId = f.toURI().toASCIIString();
    }

    /**
     * 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 systemID that may be used in association
     * with the byte or character stream, or, if neither is set, use
     * this value as a writeable URI (probably a file name).
     */
    private String systemId;

    /**
     * The byte stream that is to be written to.
     */
    private OutputStream outputStream;

    /**
     * The character stream that is to be written to.
     */
    private Writer writer;
}
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