001 /* ======================================================================== 002 * JCommon : a free general purpose class library for the Java(tm) platform 003 * ======================================================================== 004 * 005 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. 006 * 007 * Project Info: http://www.jfree.org/jcommon/index.html 008 * 009 * This library is free software; you can redistribute it and/or modify it 010 * under the terms of the GNU Lesser General Public License as published by 011 * the Free Software Foundation; either version 2.1 of the License, or 012 * (at your option) any later version. 013 * 014 * This library is distributed in the hope that it will be useful, but 015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 017 * License for more details. 018 * 019 * You should have received a copy of the GNU Lesser General Public 020 * License along with this library; if not, write to the Free Software 021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 022 * USA. 023 * 024 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 025 * in the United States and other countries.] 026 * 027 * ------------------------- 028 * DefaultConfiguration.java 029 * ------------------------- 030 * (C)opyright 2003, 2004, by Thomas Morgner and Contributors. 031 * 032 * Original Author: Thomas Morgner; 033 * Contributor(s): David Gilbert (for Object Refinery Limited); 034 * 035 * $Id: DefaultConfiguration.java,v 1.4 2005/10/18 13:24:19 mungady Exp $ 036 * 037 * Changes 038 * ------- 039 * 04.06.2003 : Initial version (TM); 040 * 041 */ 042 043 package org.jfree.util; 044 045 import java.util.Collections; 046 import java.util.Enumeration; 047 import java.util.Iterator; 048 import java.util.Properties; 049 import java.util.TreeSet; 050 051 /** 052 * Default configuration. 053 * 054 * @author Thomas Morgner. 055 * 056 */ 057 public class DefaultConfiguration extends Properties implements Configuration { 058 059 /** 060 * Creates an empty property list with no default values. 061 */ 062 public DefaultConfiguration() { 063 super(); 064 } 065 066 /** 067 * Returns the configuration property with the specified key. 068 * 069 * @param key the property key. 070 * 071 * @return the property value. 072 */ 073 public String getConfigProperty(final String key) { 074 return getProperty(key); 075 } 076 077 /** 078 * Returns the configuration property with the specified key (or the specified default value 079 * if there is no such property). 080 * <p> 081 * If the property is not defined in this configuration, the code will lookup the property in 082 * the parent configuration. 083 * 084 * @param key the property key. 085 * @param defaultValue the default value. 086 * 087 * @return the property value. 088 */ 089 public String getConfigProperty(final String key, final String defaultValue) { 090 return getProperty(key, defaultValue); 091 } 092 093 /** 094 * Searches all property keys that start with a given prefix. 095 * 096 * @param prefix the prefix that all selected property keys should share 097 * @return the properties as iterator. 098 */ 099 public Iterator findPropertyKeys(final String prefix) { 100 final TreeSet collector = new TreeSet(); 101 final Enumeration enum1 = keys(); 102 while (enum1.hasMoreElements()) { 103 final String key = (String) enum1.nextElement(); 104 if (key.startsWith(prefix)) { 105 if (collector.contains(key) == false) { 106 collector.add(key); 107 } 108 } 109 } 110 return Collections.unmodifiableSet(collector).iterator(); 111 } 112 113 public Enumeration getConfigProperties() 114 { 115 return keys(); 116 } 117 }