StringUtils.java Source code

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Here is the source code for StringUtils.java

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/**
 * 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.
 */

import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.InetAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.UnknownHostException;
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.StringTokenizer;
import java.util.Collection;

/**
 * General string utils
 */
public class StringUtils {

    final public static char COMMA = ',';
    final public static String COMMA_STR = ",";
    final public static char ESCAPE_CHAR = '\\';
    private static DecimalFormat oneDecimal = new DecimalFormat("0.0");

    /**
     * Given an array of strings, return a comma-separated list of its elements.
     * @param strs Array of strings
     * @return Empty string if strs.length is 0, comma separated list of strings
     * otherwise
     */

    public static String arrayToString(String[] strs) {
        if (strs.length == 0) {
            return "";
        }
        StringBuffer sbuf = new StringBuffer();
        sbuf.append(strs[0]);
        for (int idx = 1; idx < strs.length; idx++) {
            sbuf.append(",");
            sbuf.append(strs[idx]);
        }
        return sbuf.toString();
    }
}