/*
 * Copyright 1999-2008 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 org.apache.xml.security.utils;

import java.io.ByteArrayOutputStream;

import org.apache.xml.security.algorithms.MessageDigestAlgorithm;

/**
 * @author raul
 *
 */
public class DigesterOutputStream extends ByteArrayOutputStream {
    final MessageDigestAlgorithm mda;
    static org.apache.commons.logging.Log log =
        org.apache.commons.logging.LogFactory.getLog
        (DigesterOutputStream.class.getName());

    /**
     * @param mda
     */
    public DigesterOutputStream(MessageDigestAlgorithm mda) {
        this.mda=mda;		
    }

    /** @inheritDoc */
    public void write(byte[] arg0) {
	write(arg0, 0, arg0.length);
    }
    
    /** @inheritDoc */
    public void write(int arg0) {
	mda.update((byte)arg0);
    }
    
    /** @inheritDoc */
    public void write(byte[] arg0, int arg1, int arg2) {
        if (log.isDebugEnabled()) {
            log.debug("Pre-digested input:");
            StringBuffer sb = new StringBuffer(arg2);
            for (int i=arg1; i<(arg1+arg2); i++) {
                sb.append((char) arg0[i]);
            }
            log.debug(sb.toString());
        }
	mda.update(arg0, arg1, arg2);
    }
    
    /**
     * @return the digest value 
     */
    public byte[] getDigestValue() {
         return mda.digest();   
    }
}