/*******************************************************************************
 *
 * Copyright (c) 2004-2009 Oracle Corporation.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * 
 *    Kohsuke Kawaguchi
 *
 *
 *******************************************************************************/ 

package hudson.util;

import java.io.FilterWriter;
import java.io.Writer;
import java.io.IOException;

/**
 * Finds the lone LF and converts that to CR+LF.
 *
 * <p> Internet Explorer's <tt>XmlHttpRequest.responseText</tt> seems to
 * normalize the line end, and if we only send LF without CR, it will not
 * recognize that as a new line. To work around this problem, we use this filter
 * to always convert LF to CR+LF.
 *
 * @author Kohsuke Kawaguchi
 * @deprecated since 2008-05-28. moved to stapler
 */
public class LineEndNormalizingWriter extends FilterWriter {

    private boolean seenCR;

    public LineEndNormalizingWriter(Writer out) {
        super(out);
    }

    public void write(char cbuf[]) throws IOException {
        write(cbuf, 0, cbuf.length);
    }

    public void write(String str) throws IOException {
        write(str, 0, str.length());
    }

    public void write(int c) throws IOException {
        if (!seenCR && c == LF) {
            super.write("\r\n");
        } else {
            super.write(c);
        }
        seenCR = (c == CR);
    }

    public void write(char cbuf[], int off, int len) throws IOException {
        int end = off + len;
        int writeBegin = off;

        for (int i = off; i < end; i++) {
            char ch = cbuf[i];
            if (!seenCR && ch == LF) {
                // write up to the char before LF
                super.write(cbuf, writeBegin, i - writeBegin);
                super.write("\r\n");
                writeBegin = i + 1;
            }
            seenCR = (ch == CR);
        }

        super.write(cbuf, writeBegin, end - writeBegin);
    }

    public void write(String str, int off, int len) throws IOException {
        int end = off + len;
        int writeBegin = off;

        for (int i = off; i < end; i++) {
            char ch = str.charAt(i);
            if (!seenCR && ch == LF) {
                // write up to the char before LF
                super.write(str, writeBegin, i - writeBegin);
                super.write("\r\n");
                writeBegin = i + 1;
            }
            seenCR = (ch == CR);
        }

        super.write(str, writeBegin, end - writeBegin);
    }
    private static final int CR = 0x0D;
    private static final int LF = 0x0A;
}