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Groovy example source code file (StringUtil.groovy)

This example Groovy source code file (StringUtil.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

string, string, stringutil, stringutil

The Groovy StringUtil.groovy source code

 * Copyright 2009-2010 the original author or authors.
 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.codehaus.groovy.util

 * Provides Groovy with functionality similar to the unix tr command
 * which translates a string replacing characters from a source set
 * with characters from a replacement set.
 * @author UEHARA Junji (uehaj)
 * @author NAKANO Yasuharu (nobeans)
 * @since 1.7.3
class StringUtil {

    static String tr(String text, String source, String replacement) {
        if (!text || !source) { return text }
        source = expandHyphen(source)
        replacement = expandHyphen(replacement)

        // padding replacement with a last character, if necessary
        replacement = replacement.padRight(source.size(), replacement[replacement.size() - 1])

        return text.collect { original ->
            if (source.contains(original)) {
            } else {

    // no expansion for hyphen at start or end of Strings
    private static String expandHyphen(String text) {
        if (!text.contains('-')) { return text }
        return text.replaceAll(/(.)-(.)/, { all, begin, end -> (begin..end).join() })

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