/*
 *******************************************************************************
 * Copyright (C) 2002-2007, International Business Machines Corporation and    *
 * others. All Rights Reserved.                                                *
 *******************************************************************************
 */
package com.ibm.icu.dev.test.util;import java.util.Collections;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;

public class VariableReplacer {
	// simple implementation for now
	private Map m = new TreeMap(Collections.reverseOrder());
	
	// TODO - fix to do streams also, clean up implementation
	
	public VariableReplacer add(String variable, String value) {
		m.put(variable, value);
		return this;
	}
	public String replace(String source) {
		String oldSource;
		do {
			oldSource = source;
			for (Iterator it = m.keySet().iterator(); it.hasNext();) {
				String variable = (String) it.next();
				String value = (String) m.get(variable);
				source = replaceAll(source, variable, value);
			}
		} while (!source.equals(oldSource));
		return source;
	}
	public String replaceAll(String source, String key, String value) {
		while (true) {
			int pos = source.indexOf(key);
			if (pos < 0) return source;
			source = source.substring(0,pos) + value + source.substring(pos+key.length());
		}
	}
}