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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: * Configuration.java 29: * ------------------ 30: * (C)opyright 2002-2005, by Thomas Morgner and Contributors. 31: * 32: * Original Author: Thomas Morgner (taquera@sherito.org); 33: * Contributor(s): David Gilbert (for Object Refinery Limited); 34: * 35: * $Id: Configuration.java,v 1.6 2005/11/02 15:23:29 mungady Exp $ 36: * 37: * Changes 38: * ------- 39: * 02-May-2003 : Initial version (TM); 40: * 41: */ 42: 43: package org.jfree.util; 44: 45: import java.io.Serializable; 46: import java.util.Iterator; 47: import java.util.Enumeration; 48: 49: /** 50: * A simple query interface for a configuration. 51: * 52: * @author Thomas Morgner 53: */ 54: public interface Configuration extends Serializable { 55: 56: /** 57: * Returns the configuration property with the specified key. 58: * 59: * @param key the property key. 60: * 61: * @return the property value. 62: */ 63: public String getConfigProperty(String key); 64: 65: /** 66: * Returns the configuration property with the specified key (or the 67: * specified default value if there is no such property). 68: * <p> 69: * If the property is not defined in this configuration, the code will 70: * lookup the property in the parent configuration. 71: * 72: * @param key the property key. 73: * @param defaultValue the default value. 74: * 75: * @return the property value. 76: */ 77: public String getConfigProperty(String key, String defaultValue); 78: 79: /** 80: * Returns all keys with the given prefix. 81: * 82: * @param prefix the prefix 83: * @return the iterator containing all keys with that prefix 84: */ 85: public Iterator findPropertyKeys(String prefix); 86: 87: /** 88: * Returns the configuration properties. 89: * 90: * @return The configuration properties. 91: */ 92: public Enumeration getConfigProperties(); 93: }