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Groovy: A powerful, dynamic language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.swing.binding;
import org.codehaus.groovy.binding.AbstractFullBinding;
import org.codehaus.groovy.binding.PropertyBinding;
import org.codehaus.groovy.binding.SourceBinding;
import org.codehaus.groovy.binding.TargetBinding;
public abstract class AbstractSyntheticBinding extends AbstractFullBinding {
boolean bound;
String propertyName;
Class klass;
public AbstractSyntheticBinding(PropertyBinding source, TargetBinding target, Class klass, String propertyName) {
this.propertyName = propertyName;
this.klass = klass;
bound = false;
setSourceBinding(source);
setTargetBinding(target);
}
public void bind() {
if (!bound) {
try {
syntheticBind();
bound = true;
} catch (RuntimeException re) {
try {
syntheticUnbind();
} catch (Exception e) {
// ignore as we are re-throwing the original cause
}
throw re;
}
}
}
public void unbind() {
if (bound) {
// fail dirty, no checks
bound = false;
syntheticUnbind();
}
}
protected abstract void syntheticBind();
protected abstract void syntheticUnbind();
public void rebind() {
if (bound) {
unbind();
bind();
}
}
public void setSourceBinding(SourceBinding source) {
if (!(source instanceof PropertyBinding)) {
throw new IllegalArgumentException("Only PropertySourceBindings are accepted");
}
if (!propertyName.equals(((PropertyBinding) source).getPropertyName())) {
throw new IllegalArgumentException("PropertyName must be '" + propertyName + "'");
}
Object bean = ((PropertyBinding) source).getBean();
if ((bean == null) || !klass.isAssignableFrom(bean.getClass())) {
throw new IllegalArgumentException("SourceBean must be a " + klass.getName());
}
super.setSourceBinding(source);
}
public void setTargetBinding(TargetBinding target) {
super.setTargetBinding(target);
}
}