/*
* Copyright 2003-2007 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package groovy.util;
import groovy.lang.Closure;
import groovy.lang.GroovyObjectSupport;
import groovy.lang.GroovyRuntimeException;
import groovy.lang.MetaExpandoProperty;
import groovy.lang.MissingPropertyException;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.List;
import java.util.ArrayList;
/**
* Represents a dynamically expandable bean.
*
* @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
* @author Hein Meling
* @author Pilho Kim
* @version $Revision: 20583 $
*/
public class Expando extends GroovyObjectSupport {
private Map expandoProperties;
public Expando() {
}
public Expando(Map expandoProperties) {
this.expandoProperties = expandoProperties;
}
/**
* @return the dynamically expanded properties
*/
public Map getProperties() {
if (expandoProperties == null) {
expandoProperties = createMap();
}
return expandoProperties;
}
public List getMetaPropertyValues() {
// run through all our current properties and create MetaProperty objects
List ret = new ArrayList();
for (Object o : getProperties().entrySet()) {
Entry entry = (Entry) o;
ret.add(new MetaExpandoProperty(entry));
}
return ret;
}
public Object getProperty(String property) {
// always use the expando properties first
Object result = getProperties().get(property);
if (result != null) return result;
try {
return super.getProperty(property);
}
catch (MissingPropertyException e) {
// IGNORE
}
return null;
}
public void setProperty(String property, Object newValue) {
// always use the expando properties
getProperties().put(property, newValue);
}
public Object invokeMethod(String name, Object args) {
try {
return super.invokeMethod(name, args);
}
catch (GroovyRuntimeException e) {
// br should get a "native" property match first. getProperty includes such fall-back logic
Object value = this.getProperty(name);
if (value instanceof Closure) {
Closure closure = (Closure) value;
closure = (Closure) closure.clone();
closure.setDelegate(this);
return closure.call((Object[]) args);
} else {
throw e;
}
}
}
/**
* This allows toString to be overridden by a closure <i>field</i> method attached
* to the expando object.
*
* @see java.lang.Object#toString()
*/
public String toString() {
Object method = getProperties().get("toString");
if (method != null && method instanceof Closure) {
// invoke overridden toString closure method
Closure closure = (Closure) method;
closure.setDelegate(this);
return closure.call().toString();
} else {
return expandoProperties.toString();
}
}
/**
* This allows equals to be overridden by a closure <i>field</i> method attached
* to the expando object.
*
* @see java.lang.Object#equals(java.lang.Object)
*/
public boolean equals(Object obj) {
Object method = getProperties().get("equals");
if (method != null && method instanceof Closure) {
// invoke overridden equals closure method
Closure closure = (Closure) method;
closure.setDelegate(this);
Boolean ret = (Boolean) closure.call(obj);
return ret.booleanValue();
} else {
return super.equals(obj);
}
}
/**
* This allows hashCode to be overridden by a closure <i>field</i> method attached
* to the expando object.
*
* @see java.lang.Object#hashCode()
*/
public int hashCode() {
Object method = getProperties().get("hashCode");
if (method != null && method instanceof Closure) {
// invoke overridden hashCode closure method
Closure closure = (Closure) method;
closure.setDelegate(this);
Integer ret = (Integer) closure.call();
return ret.intValue();
} else {
return super.hashCode();
}
}
/**
* Factory method to create a new Map used to store the expando properties map
*
* @return a newly created Map implementation
*/
protected Map createMap() {
return new HashMap();
}
}