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Guava library, with additional type annotations for verification
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/*
* Copyright (C) 2007 The Guava 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 com.google.common.collect;
import com.google.common.annotations.GwtCompatible;
import com.google.common.base.Objects;
import java.util.Map.Entry;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.checker.signedness.qual.UnknownSignedness;
import org.checkerframework.dataflow.qual.Pure;
import org.checkerframework.framework.qual.AnnotatedFor;
/**
* Implementation of the {@code equals}, {@code hashCode}, and {@code toString} methods of {@code
* Entry}.
*
* @author Jared Levy
*/
@AnnotatedFor({"nullness"})
@GwtCompatible
@ElementTypesAreNonnullByDefault
abstract class AbstractMapEntry
implements Entry {
@Pure
@Override
@ParametricNullness
public abstract K getKey();
@Pure
@Override
@ParametricNullness
public abstract V getValue();
@Override
@ParametricNullness
public V setValue(@ParametricNullness V value) {
throw new UnsupportedOperationException();
}
@Pure
@Override
public boolean equals(@CheckForNull Object object) {
if (object instanceof Entry) {
Entry that = (Entry) object;
return Objects.equal(this.getKey(), that.getKey())
&& Objects.equal(this.getValue(), that.getValue());
}
return false;
}
@Pure
@Override
public int hashCode(@UnknownSignedness AbstractMapEntry this) {
K k = getKey();
V v = getValue();
return ((k == null) ? 0 : k.hashCode()) ^ ((v == null) ? 0 : v.hashCode());
}
/** Returns a string representation of the form {@code {key}={value}}. */
@Pure
@Override
public String toString() {
return getKey() + "=" + getValue();
}
}