001 /*
002 * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons-sandbox//xmlio/src/java/org/apache/commons/xmlio/in/ConversionHelpers.java,v 1.1 2004/10/08 11:56:20 ozeigermann Exp $
003 * $Revision: 155476 $
004 * $Date: 2005-02-26 13:31:24 +0000 (Sat, 26 Feb 2005) $
005 *
006 * ====================================================================
007 *
008 * Copyright 2004 The Apache Software Foundation
009 *
010 * Licensed under the Apache License, Version 2.0 (the "License");
011 * you may not use this file except in compliance with the License.
012 * You may obtain a copy of the License at
013 *
014 * http://www.apache.org/licenses/LICENSE-2.0
015 *
016 * Unless required by applicable law or agreed to in writing, software
017 * distributed under the License is distributed on an "AS IS" BASIS,
018 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
019 * See the License for the specific language governing permissions and
020 * limitations under the License.
021 *
022 */
023
024 package org.apache.commons.xmlio.in;
025
026 /**
027 * Collection of some simple conversion and fallback methods for convenience.
028 *
029 */
030 public class ConversionHelpers {
031
032 /** Returns <code>value</code> if not null, otherwise <code>fallBack</code>.
033 */
034 public static String getString(String value, String fallBack) {
035 if (value == null)
036 return fallBack;
037 return value;
038 }
039
040 /** Gets int value from a string value.
041 * @param value string value to get int from
042 * @return int representation of value or <code>-1</code>
043 * if it can not be converted to an int
044 */
045 public static int getInt(String value) {
046 return getInt(value, -1);
047 }
048
049 /** Gets int value from a string value.
050 * @param value string value to get int from
051 * @param fallBack fall back value
052 * @return int representation of value or <code>fallBack</code>
053 * if it can not be converted to an int
054 */
055 public static int getInt(String value, int fallBack) {
056 if (value == null)
057 return fallBack;
058 try {
059 return Integer.valueOf(value).intValue();
060 } catch (NumberFormatException nfe) {
061 return fallBack;
062 }
063 }
064
065 /** Gets long value from a string value.
066 * @param value string value to get long from
067 * @return long representation of value or <code>-1L</code>
068 * if it can not be converted to a long
069 */
070 public static long getLong(String value) {
071 return getLong(value, -1L);
072 }
073
074 /** Gets long value from a string value.
075 * @param value string value to get long from
076 * @param fallBack fall back value
077 * @return long representation of value or <code>fallBack</code>
078 * if it can not be converted to a long
079 */
080 public static long getLong(String value, long fallBack) {
081 if (value == null)
082 return fallBack;
083 try {
084 return Long.valueOf(value).longValue();
085 } catch (NumberFormatException nfe) {
086 return fallBack;
087 }
088 }
089
090 /** Gets boolean value from a string value.
091 * @param value string value to get boolean from
092 * @param fallBack fall back value
093 * @return boolean representation of value <code>fallBack</code>
094 * if it can not <em>properly</em> be converted to a boolean
095 */
096 public static boolean getBoolean(String value, boolean fallBack) {
097 if (value == null)
098 return fallBack;
099 // do not use "Boolean.valueOf(" as this returns false on everything
100 // but "true"
101 if ("true".equalsIgnoreCase(value))
102 return true;
103 if ("false".equalsIgnoreCase(value))
104 return false;
105 return fallBack;
106 }
107 }