001: /*
002: * $Id: MetaBeanProperty.java 4445 2006-12-17 22:35:15Z blackdrag $
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 that the
008: * following conditions are met:
009: * 1. Redistributions of source code must retain copyright statements and
010: * notices. Redistributions must also contain a copy of this document.
011: * 2. Redistributions in binary form must reproduce the above copyright
012: * notice, this list of conditions and the following disclaimer in the
013: * documentation and/or other materials provided with the distribution.
014: * 3. The name "groovy" must not be used to endorse or promote products
015: * derived from this Software without prior written permission of The Codehaus.
016: * For written permission, please contact info@codehaus.org.
017: * 4. Products derived from this Software may not be called "groovy" nor may
018: * "groovy" appear in their names without prior written permission of The
019: * Codehaus. "groovy" is a registered trademark of The Codehaus.
020: * 5. Due credit should be given to The Codehaus - http://groovy.codehaus.org/
021: *
022: * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY
023: * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
024: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
025: * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR
026: * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
027: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
028: * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
029: * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
030: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
031: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
032: * DAMAGE.
033: *
034: */
035: package groovy.lang;
036:
037: import java.lang.reflect.Modifier;
038:
039: import org.codehaus.groovy.runtime.MetaClassHelper;
040: import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
041:
042: /**
043: * Represents a property on a bean which may have a getter and/or a setter
044: *
045: * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
046: * @author Pilho Kim
047: * @version $Revision: 4445 $
048: */
049: public class MetaBeanProperty extends MetaProperty {
050:
051: private MetaMethod getter;
052: private MetaMethod setter;
053: private MetaFieldProperty field;
054:
055: public MetaBeanProperty(String name, Class type, MetaMethod getter,
056: MetaMethod setter) {
057: super (name, type);
058: this .getter = getter;
059: this .setter = setter;
060: }
061:
062: /**
063: * Get the property of the given object.
064: *
065: * @param object which to be got
066: * @return the property of the given object
067: * @throws Exception if the property could not be evaluated
068: */
069: public Object getProperty(Object object) {
070: if (getter == null) {
071: //TODO: we probably need a WriteOnlyException class
072: throw new GroovyRuntimeException(
073: "Cannot read write-only property: " + name);
074: }
075: return getter.invoke(object, MetaClassHelper.EMPTY_ARRAY);
076: }
077:
078: /**
079: * Set the property on the given object to the new value.
080: *
081: * @param object on which to set the property
082: * @param newValue the new value of the property
083: * @throws RuntimeException if the property could not be set
084: */
085: public void setProperty(Object object, Object newValue) {
086: if (setter == null) {
087: throw new GroovyRuntimeException(
088: "Cannot set read-only property: " + name);
089: }
090: newValue = DefaultTypeTransformation.castToType(newValue,
091: getType());
092: setter.invoke(object, new Object[] { newValue });
093: }
094:
095: /**
096: * Get the getter method.
097: */
098: public MetaMethod getGetter() {
099: return getter;
100: }
101:
102: /**
103: * Get the setter method.
104: */
105: public MetaMethod getSetter() {
106: return setter;
107: }
108:
109: /**
110: * This is for MetaClass to patch up the object later when looking for get*() methods.
111: */
112: void setGetter(MetaMethod getter) {
113: this .getter = getter;
114: }
115:
116: /**
117: * This is for MetaClass to patch up the object later when looking for set*() methods.
118: */
119: void setSetter(MetaMethod setter) {
120: this .setter = setter;
121: }
122:
123: public int getModifiers() {
124: if (setter != null && getter == null)
125: return setter.getModifiers();
126: if (getter != null && setter == null)
127: return getter.getModifiers();
128: int modifiers = getter.getModifiers() | setter.getModifiers();
129: int visibility = 0;
130: if (Modifier.isPublic(modifiers))
131: visibility = Modifier.PUBLIC;
132: if (Modifier.isProtected(modifiers))
133: visibility = Modifier.PROTECTED;
134: if (Modifier.isPrivate(modifiers))
135: visibility = Modifier.PRIVATE;
136: int states = getter.getModifiers() & setter.getModifiers();
137: states &= ~(Modifier.PUBLIC | Modifier.PROTECTED | Modifier.PRIVATE);
138: states |= visibility;
139: return states;
140: }
141:
142: public void setField(MetaFieldProperty f) {
143: this .field = f;
144: }
145:
146: public MetaFieldProperty getField() {
147: return field;
148: }
149: }
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