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/*___INFO__MARK_BEGIN__*/
/*************************************************************************
*
* The Contents of this file are made available subject to the terms of
* the Sun Industry Standards Source License Version 1.2
*
* Sun Microsystems Inc., March, 2001
*
*
* Sun Industry Standards Source License Version 1.2
* =================================================
* The contents of this file are subject to the Sun Industry Standards
* Source License Version 1.2 (the "License"); You may not use this file
* except in compliance with the License. You may obtain a copy of the
* License at http://gridengine.sunsource.net/Gridengine_SISSL_license.html
*
* Software provided under this License is provided on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
* See the License for the specific provisions governing your rights and
* obligations concerning the Software.
*
* The Initial Developer of the Original Code is: Sun Microsystems, Inc.
*
* Copyright: 2001 by Sun Microsystems, Inc.
*
* All Rights Reserved.
*
************************************************************************/
/*___INFO__MARK_END__*/
package com.sun.grid.util.expect;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* An <code>ExpectBuffer</code> holds the content of stdout and sterr of
* a process. <code>ExpectHandler</code>s can use the <code>consume...</code>
* method to consome content.
*
* The <code>Expect</code>object uses the <code>append</code> methods to add
* new content to the buffer.
*
*/
public class ExpectBuffer {
private static final Logger LOGGER = Logger.getLogger(ExpectBuffer.class.getName());
public final static String NL = System.getProperty("line.separator");
private final StringBuffer buffer = new StringBuffer();
/**
* Add new content to the buffer
* @param s char array with the content
* @param offset offset in the char array
* @param len len of the the content
*/
public void append(char [] s, int offset, int len) {
buffer.append(s, offset, len);
}
/**
* Add new content to the buffer
*
* @param s a string with the content
*/
public void append(String s) {
buffer.append(s);
}
/**
* get the length of the buffer
* @return length of the buffer
*/
public int length() {
return buffer.length();
}
/**
* Search the first occurancy of <code>s</code> is the buffer and consume
* it (<code>s</code> is also consumed).
*
* If the content of the buffer is "1234" a consume("2") will remove "12".
*
* @param s the search string
* @return the consumed string ("12")
*/
public String consume(String s) {
String ret = null;
synchronized(buffer) {
int index = buffer.indexOf(s);
if(index >= 0) {
int end = index + s.length();
ret = buffer.substring(0, end);
LOGGER.log(Level.FINER, "consumed: ''{0}''", ret);
buffer.delete(0, end);
}
}
return ret;
}
/**
* Search a line which contains with <code>prefix</code> and consume it.
*
* If the content of a buffer is "1\\n123\\m" a consumeLine("2") will consume
* "1\\n122\\n".
*
* @param prefix the prefix
* @return the consumed string
*/
public String consumeLine(String prefix) {
String ret = null;
synchronized(buffer) {
int index = buffer.indexOf(prefix);
if(index >= 0) {
int nl = buffer.indexOf(NL, index + 1);
if(nl > index) {
ret = buffer.substring(index + prefix.length(), nl);
LOGGER.log(Level.FINER, "consumed: ''{0}''", buffer.substring(0, nl));
buffer.delete(0, nl);
}
}
}
return ret;
}
/**
* The consume the content of the buffer until the next linefeed.
*
* @return the consumed string
*/
public String consumeLine() {
String ret = null;
synchronized(buffer) {
int nl = buffer.indexOf(NL);
if(nl >= 0) {
ret = buffer.substring(0,nl);
LOGGER.log(Level.FINER, "consumed: ''{0}''", ret);
buffer.delete(0, nl+1);
}
}
return ret;
}
}
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