/*
 * Copyright 2002-2017 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
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 * Unless required by applicable law or agreed to in writing, software
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package org.springframework.context.expression;

import java.lang.reflect.AnnotatedElement;

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

Represent an AnnotatedElement on a particular Class and is suitable as a key.
Author:Costin Leau, Stephane Nicoll
See Also:
Since:4.2
/** * Represent an {@link AnnotatedElement} on a particular {@link Class} * and is suitable as a key. * * @author Costin Leau * @author Stephane Nicoll * @since 4.2 * @see CachedExpressionEvaluator */
public final class AnnotatedElementKey implements Comparable<AnnotatedElementKey> { private final AnnotatedElement element; @Nullable private final Class<?> targetClass;
Create a new instance with the specified AnnotatedElement and optional target Class.
/** * Create a new instance with the specified {@link AnnotatedElement} and * optional target {@link Class}. */
public AnnotatedElementKey(AnnotatedElement element, @Nullable Class<?> targetClass) { Assert.notNull(element, "AnnotatedElement must not be null"); this.element = element; this.targetClass = targetClass; } @Override public boolean equals(Object other) { if (this == other) { return true; } if (!(other instanceof AnnotatedElementKey)) { return false; } AnnotatedElementKey otherKey = (AnnotatedElementKey) other; return (this.element.equals(otherKey.element) && ObjectUtils.nullSafeEquals(this.targetClass, otherKey.targetClass)); } @Override public int hashCode() { return this.element.hashCode() + (this.targetClass != null ? this.targetClass.hashCode() * 29 : 0); } @Override public String toString() { return this.element + (this.targetClass != null ? " on " + this.targetClass : ""); } @Override public int compareTo(AnnotatedElementKey other) { int result = this.element.toString().compareTo(other.element.toString()); if (result == 0 && this.targetClass != null) { if (other.targetClass == null) { return 1; } result = this.targetClass.getName().compareTo(other.targetClass.getName()); } return result; } }