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 1.5 2006/12/03 15:33:33 taqua 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: import org.jfree.base.config.ModifiableConfiguration;
052:
053: /**
054: * Default configuration.
055: *
056: * @author Thomas Morgner.
057: */
058: public class DefaultConfiguration extends Properties implements
059: ModifiableConfiguration {
060:
061: /**
062: * Creates an empty property list with no default values.
063: */
064: public DefaultConfiguration() {
065: super ();
066: }
067:
068: /**
069: * Returns the configuration property with the specified key.
070: *
071: * @param key the property key.
072: * @return the property value.
073: */
074: public String getConfigProperty(final String key) {
075: return getProperty(key);
076: }
077:
078: /**
079: * Returns the configuration property with the specified key (or the
080: * specified default value if there is no such property).
081: * <p/>
082: * If the property is not defined in this configuration, the code will
083: * lookup the property in the parent configuration.
084: *
085: * @param key the property key.
086: * @param defaultValue the default value.
087: * @return the property value.
088: */
089: public String getConfigProperty(final String key,
090: final String defaultValue) {
091: return getProperty(key, defaultValue);
092: }
093:
094: /**
095: * Searches all property keys that start with a given prefix.
096: *
097: * @param prefix the prefix that all selected property keys should share
098: * @return the properties as iterator.
099: */
100: public Iterator findPropertyKeys(final String prefix) {
101: final TreeSet collector = new TreeSet();
102: final Enumeration enum1 = keys();
103: while (enum1.hasMoreElements()) {
104: final String key = (String) enum1.nextElement();
105: if (key.startsWith(prefix)) {
106: if (collector.contains(key) == false) {
107: collector.add(key);
108: }
109: }
110: }
111: return Collections.unmodifiableSet(collector).iterator();
112: }
113:
114: public Enumeration getConfigProperties() {
115: return keys();
116: }
117:
118: /**
119: * Sets the value of a configuration property.
120: *
121: * @param key the property key.
122: * @param value the property value.
123: */
124: public void setConfigProperty(final String key, final String value) {
125: if (value == null) {
126: remove(key);
127: } else {
128: setProperty(key, value);
129: }
130: }
131: }
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