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/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowledgement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.codehaus.org/)."
* Alternately, this acknowledgement may appear in the software itself,
* if and wherever such third-party acknowledgements normally appear.
*
* 4. The names "Ant" and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*/
package org.codehaus.plexus.util;
import java.io.FilterReader;
import java.io.IOException;
import java.io.Reader;
import java.util.HashMap;
import java.util.Map;
/**
* A FilterReader which interpolates keyword values into a character stream. Keywords are recognized when enclosed
* between starting and ending delimiter strings. The keywords themselves, and their values, are fetched from a Map
* supplied to the constructor.
*
* When a possible keyword token is recognized (by detecting the starting and ending token delimiters):
*
*
*
if the enclosed string is found in the keyword Map, the delimiters and the keyword are effectively replaced by
* the keyword's value;
*
if the enclosed string is found in the keyword Map, but its value has zero length, then the token (delimiters and
* keyword) is effectively removed from the character stream;
*
if the enclosed string is not found in the keyword Map, then no substitution is made; the token text is
* passed through unaltered.
*
*
* @see LineOrientedInterpolatingReader s
*/
public class InterpolationFilterReader
extends FilterReader
{
/** replacement text from a token */
private String replaceData = null;
/** Index into replacement data */
private int replaceIndex = -1;
/** Index into previous data */
private int previousIndex = -1;
/** Hashtable to hold the replacee-replacer pairs (String to String). */
private Map variables = new HashMap