001 /*
002 $Id: ClosureModel.java,v 1.1 2003/10/24 12:47:15 jstrachan 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.model;
047
048 import groovy.lang.Closure;
049
050 /**
051 * Represents a value model using a closure to extract
052 * the value from some source model and an optional write closure
053 * for updating the value.
054 *
055 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
056 * @version $Revision: 1.1 $
057 */
058 public class ClosureModel implements ValueModel, NestedValueModel {
059
060 private ValueModel sourceModel;
061 private Closure readClosure;
062 private Closure writeClosure;
063 private Class type;
064
065 public ClosureModel(ValueModel sourceModel, Closure readClosure) {
066 this(sourceModel, readClosure, null);
067 }
068
069 public ClosureModel(ValueModel sourceModel, Closure readClosure, Closure writeClosure) {
070 this(sourceModel, readClosure, writeClosure, Object.class);
071 }
072
073 public ClosureModel(ValueModel sourceModel, Closure readClosure, Closure writeClosure, Class type) {
074 this.sourceModel = sourceModel;
075 this.readClosure = readClosure;
076 this.writeClosure = writeClosure;
077 this.type = type;
078 }
079
080 public ValueModel getSourceModel() {
081 return sourceModel;
082 }
083
084 public Object getValue() {
085 Object source = sourceModel.getValue();
086 if (source != null) {
087 return readClosure.call(source);
088 }
089 return null;
090 }
091
092 public void setValue(Object value) {
093 if (writeClosure != null) {
094 Object source = sourceModel.getValue();
095 if (source != null) {
096 writeClosure.call(new Object[] { source, value });
097 }
098 }
099 }
100
101 public Class getType() {
102 return type;
103 }
104
105 public boolean isEditable() {
106 return writeClosure != null;
107 }
108 }