/*
 * The MIT License
 * 
 * Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package hudson.util;

import java.io.IOException;
import java.io.Writer;
import java.util.LinkedList;
import java.util.List;

/**
 * {@link Writer} that spools the output and writes to another {@link Writer} later.
 *
 * @author Kohsuke Kawaguchi
 * @deprecated since 2008-05-28. moved to stapler
 */
@Deprecated
public final class CharSpool extends Writer {
    private List<char[]> buf;

    private char[] last = new char[1024];
    private int pos;

    @Override
    public void write(char[] cbuf, int off, int len) {
        while(len>0) {
            int sz = Math.min(last.length-pos,len);
            System.arraycopy(cbuf,off,last,pos,sz);
            len -= sz;
            off += sz;
            pos += sz;
            renew();
        }
    }

    private void renew() {
        if(pos<last.length)
            return;

        if(buf==null)
            buf = new LinkedList<>();
        buf.add(last);
        last = new char[1024];
        pos = 0;
    }

    @Override
    public void write(int c) {
        renew();
        last[pos++] = (char)c;
    }

    @Override
    public void flush() {
        // noop
    }

    @Override
    public void close() {
        // noop
    }

    public void writeTo(Writer w) throws IOException {
        if(buf!=null) {
            for (char[] cb : buf) {
                w.write(cb);
            }
        }
        w.write(last,0,pos);
    }
}
