yacy_search_server/source/de/anomic/http/httpdBoundedSizeOutputStream.java

//httpBoundedSizeOutputStream.java 
//-----------------------
//(C) by Michael Peter Christen; mc@yacy.net
//first published on http://www.anomic.de
//Frankfurt, Germany, 2004
//
// This file is contributed by Martin Thelian
// last major change: $LastChangedDate: 2006-08-16 21:49:31 +0200 (Mi, 16 Aug 2006) $ by $LastChangedBy: orbiter $
// Revision: $LastChangedRevision: 2414 $
//
//This program is free software; you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation; either version 2 of the License, or
//(at your option) any later version.
//
//This program 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 for more details.
//
//You should have received a copy of the GNU General Public License
//along with this program; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

package de.anomic.http;

import java.io.IOException;
import java.io.OutputStream;

public class httpdBoundedSizeOutputStream extends httpdByteCountOutputStream {

    protected final long maxSize;

    public httpdBoundedSizeOutputStream(final OutputStream outputStream, final long sizeLimit) {
        this(outputStream,0,sizeLimit);
    }
    
    public httpdBoundedSizeOutputStream(final OutputStream outputStream, final long initByteCount, final long sizeLimit) {
        super(outputStream,initByteCount,null);
        this.maxSize = sizeLimit;
    }    

    public void write(final byte[] b) throws IOException {
        if (this.byteCount + b.length > this.maxSize) {
            // write out the rest until we have reached the limit
            final long rest = this.maxSize-this.byteCount;
            if (rest > 0) this.write(b, 0, (int)rest);
            
            // throw an exception
            throw new httpdLimitExceededException("Limit exceeded",this.maxSize);
        }
        super.write(b);
    }

    public void write(final byte[] b, final int off, final int len) throws IOException {     
        if (this.byteCount + len > this.maxSize) {
            // write out the rest until we reach the limit
            final long rest = this.maxSize-this.byteCount;
            if (rest > 0) this.write(b, 0, (int)rest);
            
            // throw an exception
            throw new httpdLimitExceededException("Limit exceeded",this.maxSize);
        }
        super.write(b, off, len);
    }

    public void write(final int b) throws IOException {
        if (this.byteCount + 1 > this.maxSize) {
            // throw an exception
            throw new httpdLimitExceededException("Limit exceeded",this.maxSize);
        }
        super.write(b);
    }

    public long getSizeLimit() {
        return this.maxSize;
    }
}