001: /*
002: $Id: Reference.java 866 2004-03-09 06:59:53Z 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.lang;
047:
048: import org.codehaus.groovy.runtime.InvokerHelper;
049:
050: /**
051: * Represents a reference to a value
052: *
053: * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
054: * @version $Revision: 866 $
055: */
056: public class Reference extends GroovyObjectSupport {
057:
058: private Object value;
059:
060: public Reference() {
061: }
062:
063: public Reference(Object value) {
064: this .value = value;
065: }
066:
067: public Object getProperty(String property) {
068: Object value = get();
069: if (value != null) {
070: return InvokerHelper.getProperty(value, property);
071: }
072: return super .getProperty(property);
073: }
074:
075: public void setProperty(String property, Object newValue) {
076: Object value = get();
077: if (value != null) {
078: InvokerHelper.setProperty(value, property, newValue);
079: } else {
080: super .setProperty(property, newValue);
081: }
082: }
083:
084: public Object invokeMethod(String name, Object args) {
085: Object value = get();
086: if (value != null) {
087: try {
088: return InvokerHelper.invokeMethod(value, name, args);
089: } catch (Exception e) {
090: return super .invokeMethod(name, args);
091: }
092: } else {
093: return super .invokeMethod(name, args);
094: }
095: }
096:
097: public Object get() {
098: return value;
099: }
100:
101: public void set(Object value) {
102: this.value = value;
103: }
104: }
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