org.springframework.beans.PropertyValue Maven / Gradle / Ivy
/*
* Copyright 2002-2018 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.io.Serializable;
import org.springframework.lang.Nullable;
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.
*
* 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
*/
@SuppressWarnings("serial")
public class PropertyValue extends BeanMetadataAttributeAccessor implements Serializable {
private final String name;
@Nullable
private final Object value;
private boolean optional = false;
private boolean converted = false;
@Nullable
private Object convertedValue;
/** Package-visible field that indicates whether conversion is necessary. */
@Nullable
volatile Boolean conversionNecessary;
/** Package-visible field for caching the resolved property path tokens. */
@Nullable
transient volatile Object resolvedTokens;
/**
* 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, @Nullable Object value) {
Assert.notNull(name, "Name must not be null");
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.optional = original.isOptional();
this.converted = original.converted;
this.convertedValue = original.convertedValue;
this.conversionNecessary = original.conversionNecessary;
this.resolvedTokens = original.resolvedTokens;
setSource(original.getSource());
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, @Nullable Object newValue) {
Assert.notNull(original, "Original must not be null");
this.name = original.getName();
this.value = newValue;
this.optional = original.isOptional();
this.conversionNecessary = original.conversionNecessary;
this.resolvedTokens = original.resolvedTokens;
setSource(original);
copyAttributesFrom(original);
}
/**
* Return the name of the property.
*/
public String getName() {
return this.name;
}
/**
* Return the value of the property.
*
Note that type conversion will not have occurred here.
* It is the responsibility of the BeanWrapper implementation to
* perform type conversion.
*/
@Nullable
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;
Object source = getSource();
while (source instanceof PropertyValue && source != original) {
original = (PropertyValue) source;
source = original.getSource();
}
return original;
}
/**
* Set whether this is an optional value, that is, to be ignored
* when no corresponding property exists on the target class.
* @since 3.0
*/
public void setOptional(boolean optional) {
this.optional = optional;
}
/**
* Return whether this is an optional value, that is, to be ignored
* when no corresponding property exists on the target class.
* @since 3.0
*/
public boolean isOptional() {
return this.optional;
}
/**
* 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(@Nullable Object value) {
this.converted = true;
this.convertedValue = value;
}
/**
* Return the converted value of the constructor argument,
* after processed type conversion.
*/
@Nullable
public synchronized Object getConvertedValue() {
return this.convertedValue;
}
@Override
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(getSource(), otherPv.getSource()));
}
@Override
public int hashCode() {
return this.name.hashCode() * 29 + ObjectUtils.nullSafeHashCode(this.value);
}
@Override
public String toString() {
return "bean property '" + this.name + "'";
}
}