Spring Framework example source code file (GenericTypeAwarePropertyDescriptor.java)

This example Spring Framework source code file (GenericTypeAwarePropertyDescriptor.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Spring Framework tags/keywords

bean, class, class, generictypeawarepropertydescriptor, generictypeawarepropertydescriptor, introspectionexception, javabean, method, method, methodparameter, methodparameter, propertydescriptor, reflection, string

The Spring Framework GenericTypeAwarePropertyDescriptor.java source code

/*
 * Copyright 2002-2008 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 org.springframework.beans;

import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;

import org.springframework.core.GenericTypeResolver;
import org.springframework.core.MethodParameter;

/**
 * Extension of the standard JavaBeans PropertyDescriptor class,
 * overriding <code>getPropertyType() such that a generically
 * declared type will be resolved against the containing bean class.
 *
 * @author Juergen Hoeller
 * @since 2.5.2
 */
class GenericTypeAwarePropertyDescriptor extends PropertyDescriptor {

	private final Class beanClass;

	private Class resolvedPropertyType;

	private MethodParameter writeMethodParameter;


	public GenericTypeAwarePropertyDescriptor(Class beanClass, String propertyName,
			Method readMethod, Method writeMethod, Class propertyEditorClass)
			throws IntrospectionException {

		super(propertyName, readMethod, writeMethod);
		setPropertyEditorClass(propertyEditorClass);
		this.beanClass = beanClass;
	}


	public synchronized Class getPropertyType() {
		if (this.resolvedPropertyType == null) {
			Class propertyType = super.getPropertyType();
			Method readMethod = getReadMethod();
			if (readMethod != null) {
				this.resolvedPropertyType = GenericTypeResolver.resolveReturnType(readMethod, this.beanClass);
			}
			else {
				MethodParameter writeMethodParam = getWriteMethodParameter();
				if (writeMethodParam != null) {
					this.resolvedPropertyType = writeMethodParam.getParameterType();
				}
				else {
					this.resolvedPropertyType = propertyType;
				}
			}
		}
		return this.resolvedPropertyType;
	}

	public synchronized MethodParameter getWriteMethodParameter() {
		Method writeMethod = getWriteMethod();
		if (writeMethod == null) {
			return null;
		}
		if (this.writeMethodParameter == null) {
			this.writeMethodParameter = new MethodParameter(writeMethod, 0);
			GenericTypeResolver.resolveParameterType(this.writeMethodParameter, this.beanClass);
		}
		return this.writeMethodParameter;
	}

}