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Spring Framework example source code file (PropertyValue.java)

This example Spring Framework source code file (PropertyValue.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, beanmetadataattributeaccessor, boolean, io, javabean, object, object, original, original, propertydescriptor, propertyvalue, propertyvalue, serializable, string, string

The Spring Framework PropertyValue.java source code

/*
 * Copyright 2002-2007 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 org.springframework.beans;

import java.beans.PropertyDescriptor;
import java.io.Serializable;

import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;

/**
 * Object to hold information and value for an individual bean property.
 * Using an object here, rather than just storing all properties in
 * a map keyed by property name, allows for more flexibility, and the
 * ability to handle indexed properties etc in an optimized way.
 *
 * <p>Note that the value doesn't need to be the final required type:
 * A {@link BeanWrapper} implementation should handle any necessary conversion,
 * as this object doesn't know anything about the objects it will be applied to.
 *
 * @author Rod Johnson
 * @author Rob Harrop
 * @author Juergen Hoeller
 * @since 13 May 2001
 * @see PropertyValues
 * @see BeanWrapper
 */
public class PropertyValue extends BeanMetadataAttributeAccessor implements Serializable {

	private final String name;

	private final Object value;

	private Object source;

	private boolean converted = false;

	private Object convertedValue;

	/** Package-visible field that indicates whether conversion is necessary */
	volatile Boolean conversionNecessary;

	/** Package-visible field for caching the resolved property path tokens */
	volatile Object resolvedTokens;

	/** Package-visible field for caching the resolved PropertyDescriptor */
	volatile PropertyDescriptor resolvedDescriptor;


	/**
	 * Create a new PropertyValue instance.
	 * @param name the name of the property (never <code>null)
	 * @param value the value of the property (possibly before type conversion)
	 */
	public PropertyValue(String name, Object value) {
		this.name = name;
		this.value = value;
	}

	/**
	 * Copy constructor.
	 * @param original the PropertyValue to copy (never <code>null)
	 */
	public PropertyValue(PropertyValue original) {
		Assert.notNull(original, "Original must not be null");
		this.name = original.getName();
		this.value = original.getValue();
		this.source = original.getSource();
		this.conversionNecessary = original.conversionNecessary;
		this.resolvedTokens = original.resolvedTokens;
		this.resolvedDescriptor = original.resolvedDescriptor;
		copyAttributesFrom(original);
	}

	/**
	 * Constructor that exposes a new value for an original value holder.
	 * The original holder will be exposed as source of the new holder.
	 * @param original the PropertyValue to link to (never <code>null)
	 * @param newValue the new value to apply
	 */
	public PropertyValue(PropertyValue original, Object newValue) {
		Assert.notNull(original, "Original must not be null");
		this.name = original.getName();
		this.value = newValue;
		this.source = original;
		this.conversionNecessary = original.conversionNecessary;
		this.resolvedTokens = original.resolvedTokens;
		this.resolvedDescriptor = original.resolvedDescriptor;
		copyAttributesFrom(original);
	}


	/**
	 * Return the name of the property.
	 */
	public String getName() {
		return this.name;
	}

	/**
	 * Return the value of the property.
	 * <p>Note that type conversion will not have occurred here.
	 * It is the responsibility of the BeanWrapper implementation to
	 * perform type conversion.
	 */
	public Object getValue() {
		return this.value;
	}

	/**
	 * Return the original PropertyValue instance for this value holder.
	 * @return the original PropertyValue (either a source of this
	 * value holder or this value holder itself).
	 */
	public PropertyValue getOriginalPropertyValue() {
		PropertyValue original = this;
		while (original.source instanceof PropertyValue && original.source != original) {
			original = (PropertyValue) original.source;
		}
		return original;
	}

	/**
	 * Return whether this holder contains a converted value already (<code>true),
	 * or whether the value still needs to be converted (<code>false).
	 */
	public synchronized boolean isConverted() {
		return this.converted;
	}

	/**
	 * Set the converted value of the constructor argument,
	 * after processed type conversion.
	 */
	public synchronized void setConvertedValue(Object value) {
		this.converted = true;
		this.convertedValue = value;
	}

	/**
	 * Return the converted value of the constructor argument,
	 * after processed type conversion.
	 */
	public synchronized Object getConvertedValue() {
		return this.convertedValue;
	}


	public boolean equals(Object other) {
		if (this == other) {
			return true;
		}
		if (!(other instanceof PropertyValue)) {
			return false;
		}
		PropertyValue otherPv = (PropertyValue) other;
		return (this.name.equals(otherPv.name) &&
				ObjectUtils.nullSafeEquals(this.value, otherPv.value) &&
				ObjectUtils.nullSafeEquals(this.source, otherPv.source));
	}

	public int hashCode() {
		return this.name.hashCode() * 29 + ObjectUtils.nullSafeHashCode(this.value);
	}

	public String toString() {
		return "bean property '" + this.name + "'";
	}

}

Other Spring Framework examples (source code examples)

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