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1: /* ======================================================================== 2: * JCommon : a free general purpose class library for the Java(tm) platform 3: * ======================================================================== 4: * 5: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jcommon/index.html 8: * 9: * This library is free software; you can redistribute it and/or modify it 10: * under the terms of the GNU Lesser General Public License as published by 11: * the Free Software Foundation; either version 2.1 of the License, or 12: * (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but 15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17: * License for more details. 18: * 19: * You should have received a copy of the GNU Lesser General Public 20: * License along with this library; if not, write to the Free Software 21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 22: * USA. 23: * 24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 25: * in the United States and other countries.] 26: * 27: * ------------------------- 28: * DefaultConfiguration.java 29: * ------------------------- 30: * (C)opyright 2003, 2004, by Thomas Morgner and Contributors. 31: * 32: * Original Author: Thomas Morgner; 33: * Contributor(s): David Gilbert (for Object Refinery Limited); 34: * 35: * $Id: DefaultConfiguration.java,v 1.4 2005/10/18 13:24:19 mungady Exp $ 36: * 37: * Changes 38: * ------- 39: * 04.06.2003 : Initial version (TM); 40: * 41: */ 42: 43: package org.jfree.util; 44: 45: import java.util.Collections; 46: import java.util.Enumeration; 47: import java.util.Iterator; 48: import java.util.Properties; 49: import java.util.TreeSet; 50: 51: /** 52: * Default configuration. 53: * 54: * @author Thomas Morgner. 55: * 56: */ 57: public class DefaultConfiguration extends Properties implements Configuration { 58: 59: /** 60: * Creates an empty property list with no default values. 61: */ 62: public DefaultConfiguration() { 63: super(); 64: } 65: 66: /** 67: * Returns the configuration property with the specified key. 68: * 69: * @param key the property key. 70: * 71: * @return the property value. 72: */ 73: public String getConfigProperty(final String key) { 74: return getProperty(key); 75: } 76: 77: /** 78: * Returns the configuration property with the specified key (or the specified default value 79: * if there is no such property). 80: * <p> 81: * If the property is not defined in this configuration, the code will lookup the property in 82: * the parent configuration. 83: * 84: * @param key the property key. 85: * @param defaultValue the default value. 86: * 87: * @return the property value. 88: */ 89: public String getConfigProperty(final String key, final String defaultValue) { 90: return getProperty(key, defaultValue); 91: } 92: 93: /** 94: * Searches all property keys that start with a given prefix. 95: * 96: * @param prefix the prefix that all selected property keys should share 97: * @return the properties as iterator. 98: */ 99: 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: }