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ReflectionPropertyAccessor.java
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ReflectionPropertyAccessor.java
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/*
* Copyright 2013 JBoss Inc
*
* 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 org.optaplanner.core.impl.domain.common;
import java.beans.PropertyDescriptor;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
/**
* Wraps {@link PropertyDescriptor} for faster and easier access.
*/
public final class ReflectionPropertyAccessor implements PropertyAccessor {
private final PropertyDescriptor propertyDescriptor;
private final Method readMethod;
private final Method writeMethod;
public ReflectionPropertyAccessor(PropertyDescriptor propertyDescriptor) {
this.propertyDescriptor = propertyDescriptor;
readMethod = propertyDescriptor.getReadMethod();
if (readMethod == null) {
throw new IllegalStateException("The propertyDescriptor (" + propertyDescriptor
+ ") lacks a readMethod (" + readMethod + ").");
}
readMethod.setAccessible(true); // Performance hack by avoiding security checks
writeMethod = propertyDescriptor.getWriteMethod();
if (writeMethod != null) {
writeMethod.setAccessible(true); // Performance hack by avoiding security checks
}
}
public String getName() {
return propertyDescriptor.getName();
}
@Override
public Class<?> getType() {
return propertyDescriptor.getPropertyType();
}
@Override
public Type getGenericType() {
return readMethod.getGenericReturnType();
}
public Object executeGetter(Object bean) {
try {
return readMethod.invoke(bean);
} catch (IllegalAccessException e) {
throw new IllegalStateException("Cannot call property (" + propertyDescriptor.getName()
+ ") getter on bean of class (" + bean.getClass() + ").", e);
} catch (InvocationTargetException e) {
throw new IllegalStateException("The property (" + propertyDescriptor.getName()
+ ") getter on bean of class (" + bean.getClass() + ") throws an exception.",
e.getCause());
}
}
public void executeSetter(Object bean, Object value) {
try {
writeMethod.invoke(bean, value);
} catch (IllegalAccessException e) {
throw new IllegalStateException("Cannot call property (" + propertyDescriptor.getName()
+ ") setter on bean of class (" + bean.getClass() + ").", e);
} catch (InvocationTargetException e) {
throw new IllegalStateException("The property (" + propertyDescriptor.getName()
+ ") setter on bean of class (" + bean.getClass() + ") throws an exception.",
e.getCause());
}
}
// ************************************************************************
// AnnotatedElement methods
// ************************************************************************
@Override
public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) {
return readMethod.isAnnotationPresent(annotationClass);
}
@Override
public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
return readMethod.getAnnotation(annotationClass);
}
@Override
public Annotation[] getAnnotations() {
return readMethod.getAnnotations();
}
@Override
public Annotation[] getDeclaredAnnotations() {
return readMethod.getDeclaredAnnotations();
}
}