/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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 Lesser General Public License for more details.
*
* Copyright (c) 2002-2013 Pentaho Corporation.. All rights reserved.
*/
package org.pentaho.reporting.libraries.base.util;
import java.io.IOException;
import java.io.Reader;
public class MemoryStringReader extends Reader {
private char[] backend;
private int offset;
private int length;
public MemoryStringReader( final char[] backend, final int offset, final int length ) {
this.backend = backend.clone();
this.offset = offset;
this.length = length;
}
public int read( final char[] chars, final int offset, final int length ) throws IOException {
if ( length == 0 ) {
return 0;
}
if ( this.length == 0 ) {
// signal eof
return -1;
}
final int readLength = Math.min( length, this.length );
System.arraycopy( backend, this.offset, chars, offset, readLength );
this.offset += readLength;
this.length -= readLength;
return readLength;
}
public void close() throws IOException {
// do nothing ..
}
}