001 /* JAPI - (Yet another (hopefully) useful) Java API
002 *
003 * Copyright (C) 2004-2006 Christian Hujer
004 *
005 * This program is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU General Public License as
007 * published by the Free Software Foundation; either version 2 of the
008 * License, or (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful, but
011 * WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
013 * General Public License for more details.
014 *
015 * You should have received a copy of the GNU General Public License
016 * along with this program; if not, write to the Free Software
017 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
018 * 02111-1307, USA.
019 */
020
021 package net.sf.japi.lang;
022
023 import java.lang.reflect.InvocationTargetException;
024 import java.lang.reflect.Method;
025
026 /** Class for working with Properties.
027 * @author <a href="mailto:chris@riedquat.de">Christian Hujer</a>
028 */
029 @SuppressWarnings({"UtilityClass"})
030 public class Properties {
031
032 /** Get a property of an object.
033 * @param object
034 * @param propertyName
035 * @see #setPropertyFromString(Object, String, String)
036 */
037 public static String getPropertyAsString(final Object object, final String propertyName) {
038 final String getterName = new StringBuilder().append("get").append(propertyName.substring(0, 1).toUpperCase()).append(propertyName.substring(1)).toString();
039 final String isserName = new StringBuilder().append("is").append(propertyName.substring(0, 1).toUpperCase()).append(propertyName.substring(1)).toString();
040 Method getter = null;
041 for (final Method method : object.getClass().getMethods()) {
042 final Class<?>[] parameterTypes = method.getParameterTypes();
043 final String methodName = method.getName();
044 if (parameterTypes.length == 0 && (methodName.equals(getterName) || methodName.equals(isserName))) {
045 getter = method;
046 }
047 }
048 if (getter == null) {
049 throw new NoSuchMethodError(getterName + '|' + isserName);
050 }
051 try {
052 return getter.invoke(object).toString();
053 } catch (final IllegalAccessException e) {
054 throw new NoSuchMethodError(getterName + '|' + isserName + ": " + e);
055 } catch (final InvocationTargetException e) {
056 throw new NoSuchMethodError(getterName + '|' + isserName + ": " + e);
057 }
058 }
059
060 /** Set a property of an object.
061 * @param object Object to invoke setter on
062 * @param propertyName Name of the property to get setter for
063 * @param value Value to set as String (conversions from {@link java.beans} are used)
064 * @see #getPropertyAsString(Object, String)
065 */
066 @SuppressWarnings({"IfStatementWithTooManyBranches", "ObjectEquality", "StringToUpperCaseOrToLowerCaseWithoutLocale", "OverlyComplexMethod"})
067 public static void setPropertyFromString(final Object object, final String propertyName, final String value) {
068 final String setterName = new StringBuilder().append("set").append(propertyName.substring(0, 1).toUpperCase()).append(propertyName.substring(1)).toString();
069 Method setter = null;
070 Object rawValue = null;
071 for (final Method method : object.getClass().getMethods()) {
072 final Class<?>[] parameterTypes = method.getParameterTypes();
073 if (parameterTypes.length == 1 && method.getName().equals(setterName)) {
074 final Class<?> parameterType = parameterTypes[0];
075 setter = method;
076 if (parameterType == Boolean.TYPE) {
077 rawValue = Boolean.valueOf(value);
078 } else if (parameterType == Character.TYPE) {
079 rawValue = value.charAt(0);
080 } else if (parameterType == Byte.TYPE) {
081 rawValue = Byte.valueOf(value);
082 } else if (parameterType == Short.TYPE) {
083 rawValue = Short.valueOf(value);
084 } else if (parameterType == Integer.TYPE) {
085 rawValue = Integer.valueOf(value);
086 } else if (parameterType == Long.TYPE) {
087 rawValue = Long.valueOf(value);
088 } else if (parameterType == Float.TYPE) {
089 rawValue = Float.valueOf(value);
090 } else if (parameterType == Double.TYPE) {
091 rawValue = Double.valueOf(value);
092 } else {
093 rawValue = value;
094 }
095 }
096 }
097 if (setter == null) {
098 throw new NoSuchMethodError(setterName);
099 }
100 try {
101 setter.invoke(object, rawValue);
102 } catch (final IllegalAccessException e) {
103 throw new NoSuchMethodError(setterName + ": " + e);
104 } catch (final InvocationTargetException e) {
105 throw new NoSuchMethodError(setterName + ": " + e);
106 }
107 }
108
109 /** Private constructor for Utility class. */
110 private Properties() {
111 }
112
113 } // class Properties