org.springframework.core.enums.AbstractLabeledEnum Maven / Gradle / Ivy
/*
* Copyright 2002-2005 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.core.enums;
import org.springframework.util.Assert;
/**
* Abstract base superclass for LabeledEnum implementations.
*
* @author Keith Donald
* @since 1.2.2
*/
public abstract class AbstractLabeledEnum implements LabeledEnum {
/**
* Create a new AbstractLabeledEnum instance.
*/
protected AbstractLabeledEnum() {
}
public Class getType() {
return getClass();
}
/*
* This abstract method declaration shadows the method in the LabeledEnum interface.
* This is necessary to properly work on Sun's JDK 1.3 classic VM in all cases.
*/
public abstract Comparable getCode();
/*
* This abstract method declaration shadows the method in the LabeledEnum interface.
* This is necessary to properly work on Sun's JDK 1.3 classic VM in all cases.
*/
public abstract String getLabel();
public int compareTo(Object obj) {
Assert.isTrue(obj instanceof AbstractLabeledEnum, "You may only compare LabeledEnums");
LabeledEnum other = (LabeledEnum) obj;
Assert.isTrue(this.getType().equals(other.getType()),
"You may only compare LabeledEnums of the same type");
return this.getCode().compareTo(other.getCode());
}
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof LabeledEnum)) {
return false;
}
LabeledEnum other = (LabeledEnum) obj;
return this.getType().equals(other.getType()) && this.getCode().equals(other.getCode());
}
public int hashCode() {
return getType().hashCode() * 29 * getCode().hashCode();
}
public String toString() {
String enumStr = (getLabel() != null ? getLabel() + " (" + getCode() + ")" : String.valueOf(getCode()));
return "[" + getType() + "." + enumStr + "]";
}
}