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* 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 org.apache.cayenne.reflect;
/**
* An abstract property descriptor that delegates property access to an {@link Accessor}.
* Used as a superclass for other implementations.
*
* @since 3.0
*/
public abstract class BaseProperty implements PropertyDescriptor {
protected ClassDescriptor owner;
protected Accessor accessor;
// name is derived from accessor, cached here for performance
final String name;
public BaseProperty(ClassDescriptor owner, Accessor accessor) {
if (accessor == null) {
throw new IllegalArgumentException("Null accessor");
}
this.accessor = accessor;
this.owner = owner;
this.name = accessor.getName();
}
public Object readProperty(Object object) throws PropertyException {
return readPropertyDirectly(object);
}
public void writeProperty(Object object, Object oldValue, Object newValue)
throws PropertyException {
writePropertyDirectly(object, oldValue, newValue);
}
public String getName() {
return name;
}
public abstract boolean visit(PropertyVisitor visitor);
/**
* Does nothing.
*/
public void injectValueHolder(Object object) throws PropertyException {
// noop
}
public Object readPropertyDirectly(Object object) throws PropertyException {
return accessor.getValue(object);
}
public void writePropertyDirectly(Object object, Object oldValue, Object newValue)
throws PropertyException {
accessor.setValue(object, newValue);
}
@Override
public String toString() {
StringBuilder buffer = new StringBuilder();
buffer.append(getClass().getName()).append('@').append(
System.identityHashCode(this)).append('[').append(name).append(']');
return buffer.toString();
}
}