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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 1.6 2008/09/10 09:21:30 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: import org.jfree.base.config.ModifiableConfiguration; 52: 53: /** 54: * Default configuration. 55: * 56: * @author Thomas Morgner. 57: */ 58: public class DefaultConfiguration extends Properties 59: implements ModifiableConfiguration 60: { 61: 62: /** 63: * Creates an empty property list with no default values. 64: */ 65: public DefaultConfiguration() 66: { 67: super(); 68: } 69: 70: /** 71: * Returns the configuration property with the specified key. 72: * 73: * @param key the property key. 74: * @return the property value. 75: */ 76: public String getConfigProperty(final String key) 77: { 78: return getProperty(key); 79: } 80: 81: /** 82: * Returns the configuration property with the specified key (or the 83: * specified default value if there is no such property). 84: * <p/> 85: * If the property is not defined in this configuration, the code will 86: * lookup the property in the parent configuration. 87: * 88: * @param key the property key. 89: * @param defaultValue the default value. 90: * @return the property value. 91: */ 92: public String getConfigProperty(final String key, final String defaultValue) 93: { 94: return getProperty(key, defaultValue); 95: } 96: 97: /** 98: * Searches all property keys that start with a given prefix. 99: * 100: * @param prefix the prefix that all selected property keys should share 101: * @return the properties as iterator. 102: */ 103: public Iterator findPropertyKeys(final String prefix) 104: { 105: final TreeSet collector = new TreeSet(); 106: final Enumeration enum1 = keys(); 107: while (enum1.hasMoreElements()) 108: { 109: final String key = (String) enum1.nextElement(); 110: if (key.startsWith(prefix)) 111: { 112: if (collector.contains(key) == false) 113: { 114: collector.add(key); 115: } 116: } 117: } 118: return Collections.unmodifiableSet(collector).iterator(); 119: } 120: 121: /** 122: * Returns an enumeration of the property keys. 123: * 124: * @return An enumeration of the property keys. 125: */ 126: public Enumeration getConfigProperties() 127: { 128: return keys(); 129: } 130: 131: /** 132: * Sets the value of a configuration property. 133: * 134: * @param key the property key. 135: * @param value the property value. 136: */ 137: public void setConfigProperty(final String key, final String value) 138: { 139: if (value == null) 140: { 141: remove(key); 142: } 143: else 144: { 145: setProperty(key, value); 146: } 147: } 148: }