// $Header: /home/cvs/jakarta-jmeter/src/core/org/apache/jmeter/util/StringUtilities.java,v 1.4 2004/02/14 03:34:30 sebb Exp $
/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
*/

package org.apache.jmeter.util;

import junit.framework.TestCase;

/**
 * @version $Revision: 1.4 $
 */
public final class StringUtilities
{
    public static String substitute(String input, String pattern, String sub)
    {
        StringBuffer ret = new StringBuffer();
        int start = 0;
        int index = -1;
        while ((index = input.indexOf(pattern, start)) >= start)
        {
            ret.append(input.substring(start, index));
            ret.append(sub);
            start = index + pattern.length();
        }
        ret.append(input.substring(start));
        return ret.toString();
    }

    /**
     * Private constructor to prevent instantiation.
     */
    private StringUtilities()
    {
    }
    
    public static class Test extends TestCase
    {
        public Test(String name)
        {
            super(name);
        }

        public void testSub1() throws Exception
        {
            String input = "http://jakarta.apache.org/jmeter/index.html";
            String pattern = "jakarta.apache.org";
            String sub = "${server}";
            assertEquals(
                "http://${server}/jmeter/index.html",
                StringUtilities.substitute(input, pattern, sub));
        }

        public void testSub2() throws Exception
        {
            String input = "arg1=param1;param1";
            String pattern = "param1";
            String sub = "${value}";
            assertEquals(
                "arg1=${value};${value}",
                StringUtilities.substitute(input, pattern, sub));
        }

        public void testSub3() throws Exception
        {
            String input = "jakarta.apache.org";
            String pattern = "jakarta.apache.org";
            String sub = "${server}";
            assertEquals(
                "${server}",
                StringUtilities.substitute(input, pattern, sub));
        }

    }
}