Translate characters in a String. - Java Internationalization

Java examples for Internationalization:Charset

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Description

Translate characters in a String.

Demo Code

/*/* w w  w.j av  a  2 s  .c o  m*/
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

public class Main{
    public static void main(String[] argv) throws Exception{
        String str = "java2s.com";
        String searchChars = "java2s.com";
        String replaceChars = "java2s.com";
        System.out.println(translate(str,searchChars,replaceChars));
    }
    /**
     * <p>Translate characters in a String.
     * This is a multi character search and replace routine.</p>
     *
     * <p>An example is:</p>
     * <ul>
     *   <li>translate(&quot;hello&quot;, &quot;ho&quot;, &quot;jy&quot;)
     *    =&gt; jelly</li>
     * </ul>
     *
     * <p>If the length of characters to search for is greater than the
     * length of characters to replace, then the last character is 
     * used.</p>
     * 
     * <pre>
     * CharSetUtils.translate(null, *, *) = null
     * CharSetUtils.translate("", *, *)   = ""
     * </pre>
     *
     * @param str  String to replace characters in, may be null
     * @param searchChars   a set of characters to search for, must not be null
     * @param replaceChars  a set of characters to replace, must not be null or empty (&quot;&quot;)
     * @return translated String, <code>null</code> if null string input
     * @throws NullPointerException if <code>searchChars</code> or <code>replaceChars</code> 
     *  is <code>null</code>
     * @throws ArrayIndexOutOfBoundsException if <code>replaceChars</code> is empty (&quot;&quot;)
     * @deprecated Use {@link StringUtils#replaceChars(String, String, String)}.
     *             Method will be removed in Commons Lang 3.0.
     *  NOTE: StringUtils#replaceChars behaves differently when 'searchChars' is longer
     *  than 'replaceChars'. CharSetUtils#translate will use the last char of the replacement
     *  string whereas StringUtils#replaceChars will delete
     */
    public static String translate(String str, String searchChars,
            String replaceChars) {
        if (StringUtils.isEmpty(str)) {
            return str;
        }
        StringBuffer buffer = new StringBuffer(str.length());
        char[] chrs = str.toCharArray();
        char[] withChrs = replaceChars.toCharArray();
        int sz = chrs.length;
        int withMax = replaceChars.length() - 1;
        for (int i = 0; i < sz; i++) {
            int idx = searchChars.indexOf(chrs[i]);
            if (idx != -1) {
                if (idx > withMax) {
                    idx = withMax;
                }
                buffer.append(withChrs[idx]);
            } else {
                buffer.append(chrs[i]);
            }
        }
        return buffer.toString();
    }
}

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