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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
package org.ietf.ldap.ber.stream;
import java.util.*;
import java.io.*;
/**
* This abstract class serves as a base class for constructed
* types such as sequence or set.
* <P>See CCITT X.209.
*
* @version 1.0
*/
public abstract class BERConstruct extends BERElement {
/**
* List of BER elements in the construct.
*/
private Vector m_elements = new Vector();
/**
* Constructs a construct element.
*/
public BERConstruct() {
}
/**
* Constructs a construct element from an input stream.
* @param decoder decoder for application specific BER
* @param stream input stream from socket
* @param bytes_read array of 1 int; value incremented by number
* of bytes read from stream
* @exception IOException failed to construct
*/
public BERConstruct(BERTagDecoder decoder, InputStream stream,
int[] bytes_read) throws IOException {
int contents_length = super.readLengthOctets(stream,bytes_read);
int[] component_length = new int[1];
if (contents_length == -1) {
/* Constructed - indefinite length */
BERElement element = null;
{
component_length[0] = 0;
element = getElement(decoder, stream, component_length);
if (element != null)
addElement(element);
} while (element != null);
} else {
/* Constructed - definite length */
bytes_read[0] += contents_length;
while (contents_length > 0)
{
component_length[0] = 0;
addElement(getElement(decoder, stream,component_length));
contents_length -= component_length[0];
}
}
}
/**
* Adds an element to the list.
* @return BER encoding of the element.
*/
public void addElement(BERElement element) {
m_elements.addElement(element);
}
/**
* Retrieves number of elements.
* @return number of elements.
*/
public int size() {
return m_elements.size();
}
/**
* Gets ber element at specific position.
* @param index index of the element to get
* @return BER element.
*/
public BERElement elementAt(int index) {
return (BERElement)m_elements.elementAt(index);
}
/**
* Sends the BER encoding directly to a stream.
* @param stream output stream
* @exception IOException failed to send
*/
public void write(OutputStream stream) throws IOException {
stream.write(getType());
ByteArrayOutputStream contents_stream = new ByteArrayOutputStream();
for (int i = 0; i < m_elements.size(); i++) {
BERElement e = elementAt(i);
e.write(contents_stream);
}
byte[] contents_buffer = contents_stream.toByteArray();
sendDefiniteLength(stream, contents_buffer.length);
stream.write(contents_buffer);
}
/**
* Gets the element type.
* @param element type
*/
public abstract int getType();
/**
* Gets the string representation.
* @return string representation of tag.
*/
public abstract String toString();
}
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