org.joda.beans.impl.BasicProperty Maven / Gradle / Ivy
/*
* Copyright 2001-present Stephen Colebourne
*
* 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.joda.beans.impl;
import org.joda.beans.Bean;
import org.joda.beans.MetaProperty;
import org.joda.beans.Property;
/**
* A property that binds a {@code Bean} to a {@code MetaProperty}.
*
* This is the standard implementation of a property.
* It defers the strategy of getting and setting the value to the meta-property.
*
* This implementation is also a map entry to aid performance in maps.
*
* @param
the type of the property content
*/
public final class BasicProperty
implements Property
{
/** The bean that the property is bound to. */
private final Bean bean;
/** The meta-property that the property is bound to. */
private final MetaProperty
metaProperty;
/**
* Factory to create a property avoiding duplicate generics.
*
* @param
the property type
* @param bean the bean that the property is bound to, not null
* @param metaProperty the meta property, not null
* @return the property, not null
*/
public static
BasicProperty
of(Bean bean, MetaProperty
metaProperty) {
return new BasicProperty<>(bean, metaProperty);
}
/**
* Creates a property binding the bean to the meta-property.
*
* @param bean the bean that the property is bound to, not null
* @param metaProperty the meta property, not null
*/
private BasicProperty(Bean bean, MetaProperty
metaProperty) {
if (bean == null) {
throw new NullPointerException("Bean must not be null");
}
if (metaProperty == null) {
throw new NullPointerException("MetaProperty must not be null");
}
this.bean = bean;
this.metaProperty = metaProperty;
}
//-----------------------------------------------------------------------
@SuppressWarnings("unchecked")
@Override
public B bean() {
return (B) bean;
}
@Override
public MetaProperty
metaProperty() {
return metaProperty;
}
//-----------------------------------------------------------------------
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof Property) {
Property other = (Property) obj;
if (metaProperty.equals(other.metaProperty())) {
Object a = get();
Object b = other.get();
return a == null ? b == null : a.equals(b);
}
}
return false;
}
@Override
public int hashCode() {
P value = get();
return metaProperty.hashCode() ^ (value == null ? 0 : value.hashCode());
}
/**
* Returns a string that summarises the property.
*
* @return a summary string, not null
*/
@Override
public String toString() {
return metaProperty + "=" + get();
}
}