001 /* 002 $Id: Expando.java,v 1.4 2005/06/13 06:43:38 glaforge Exp $ 003 004 Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved. 005 006 Redistribution and use of this software and associated documentation 007 ("Software"), with or without modification, are permitted provided 008 that the following conditions are met: 009 010 1. Redistributions of source code must retain copyright 011 statements and notices. Redistributions must also contain a 012 copy of this document. 013 014 2. Redistributions in binary form must reproduce the 015 above copyright notice, this list of conditions and the 016 following disclaimer in the documentation and/or other 017 materials provided with the distribution. 018 019 3. The name "groovy" must not be used to endorse or promote 020 products derived from this Software without prior written 021 permission of The Codehaus. For written permission, 022 please contact info@codehaus.org. 023 024 4. Products derived from this Software may not be called "groovy" 025 nor may "groovy" appear in their names without prior written 026 permission of The Codehaus. "groovy" is a registered 027 trademark of The Codehaus. 028 029 5. Due credit should be given to The Codehaus - 030 http://groovy.codehaus.org/ 031 032 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS 033 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 034 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 035 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 036 THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 037 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 038 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 039 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 040 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 041 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 042 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 043 OF THE POSSIBILITY OF SUCH DAMAGE. 044 045 */ 046 package groovy.util; 047 048 import groovy.lang.Closure; 049 import groovy.lang.GroovyObjectSupport; 050 import groovy.lang.GroovyRuntimeException; 051 import groovy.lang.MetaExpandoProperty; 052 053 import java.util.HashMap; 054 import java.util.Map; 055 import java.util.Map.Entry; 056 import java.util.List; 057 import java.util.ArrayList; 058 import java.util.Iterator; 059 060 061 /** 062 * Represents a dynamically expandable bean. 063 * 064 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> 065 * @version $Revision: 1.4 $ 066 */ 067 public class Expando extends GroovyObjectSupport { 068 069 private Map expandoProperties; 070 071 public Expando() { 072 } 073 074 public Expando(Map expandoProperties) { 075 this.expandoProperties = expandoProperties; 076 } 077 078 /** 079 * @return the dynamically expanded properties 080 */ 081 public Map getExpandoProperties() { 082 if (expandoProperties == null) { 083 expandoProperties = createMap(); 084 } 085 return expandoProperties; 086 } 087 088 public List getProperties() { 089 // run through all our current properties and create MetaProperty objects 090 List ret = new ArrayList(); 091 Iterator itr = getExpandoProperties().entrySet().iterator(); 092 while(itr.hasNext()) { 093 Entry entry = (Entry) itr.next(); 094 ret.add(new MetaExpandoProperty(entry)); 095 } 096 097 return ret; 098 } 099 100 public Object getProperty(String property) { 101 try { 102 return super.getProperty(property); 103 } 104 catch (GroovyRuntimeException e) { 105 return getExpandoProperties().get(property); 106 } 107 } 108 109 public void setProperty(String property, Object newValue) { 110 try { 111 super.setProperty(property, newValue); 112 } 113 catch (GroovyRuntimeException e) { 114 getExpandoProperties().put(property, newValue); 115 } 116 } 117 118 public Object invokeMethod(String name, Object args) { 119 try { 120 return super.invokeMethod(name, args); 121 } 122 catch (GroovyRuntimeException e) { 123 // br should get a "native" property match first. getProperty includes such fall-back logic 124 Object value = this.getProperty(name); 125 if (value instanceof Closure) { 126 Closure closure = (Closure) value; 127 closure.setDelegate(this); 128 return closure.call(args); 129 } 130 else { 131 throw e; 132 } 133 } 134 135 } 136 137 public String toString() { 138 return expandoProperties.toString(); 139 } 140 141 /** 142 * Factory method to create a new Map used to store the expando properties map 143 * @return a newly created Map implementation 144 */ 145 protected Map createMap() { 146 return new HashMap(); 147 } 148 149 }