001: /*
002: $Id: ClosureModel.java 209 2003-10-24 12:47:18Z jstrachan $
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: 209 $
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,
070: Closure writeClosure) {
071: this (sourceModel, readClosure, writeClosure, Object.class);
072: }
073:
074: public ClosureModel(ValueModel sourceModel, Closure readClosure,
075: Closure writeClosure, Class type) {
076: this .sourceModel = sourceModel;
077: this .readClosure = readClosure;
078: this .writeClosure = writeClosure;
079: this .type = type;
080: }
081:
082: public ValueModel getSourceModel() {
083: return sourceModel;
084: }
085:
086: public Object getValue() {
087: Object source = sourceModel.getValue();
088: if (source != null) {
089: return readClosure.call(source);
090: }
091: return null;
092: }
093:
094: public void setValue(Object value) {
095: if (writeClosure != null) {
096: Object source = sourceModel.getValue();
097: if (source != null) {
098: writeClosure.call(new Object[] { source, value });
099: }
100: }
101: }
102:
103: public Class getType() {
104: return type;
105: }
106:
107: public boolean isEditable() {
108: return writeClosure != null;
109: }
110: }
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