/*
* 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.base;
import com.google.common.annotations.GwtCompatible;
import javax.annotation.Nullable;
/**
* Determines a true or false value for a given input.
*
* @author Kevin Bourrillion
* @since 2.0 (imported from Google Collections Library)
*/
@GwtCompatible
public interface Predicate<T> {
/**
* Returns the result of applying this predicate to {@code input}. This method is <i>generally
* expected</i>, but not absolutely required, to have the following properties:
*
* <ul>
* <li>Its execution does not cause any observable side effects.
* <li>The computation is <i>consistent with equals</i>; that is, {@link Objects#equal
* Objects.equal}{@code (a, b)} implies that {@code predicate.apply(a) ==
* predicate.apply(b))}.
* </ul>
*
* @throws NullPointerException if {@code input} is null and this predicate does not accept null
* arguments
*/
boolean apply(@Nullable T input);
/**
* Indicates whether another object is equal to this predicate.
*
* <p>Most implementations will have no reason to override the behavior of {@link Object#equals}.
* However, an implementation may also choose to return {@code true} whenever {@code object} is a
* {@link Predicate} that it considers <i>interchangeable</i> with this one. "Interchangeable"
* <i>typically</i> means that {@code this.apply(t) == that.apply(t)} for all {@code t} of type
* {@code T}). Note that a {@code false} result from this method does not imply that the
* predicates are known <i>not</i> to be interchangeable.
*/
@Override
boolean equals(@Nullable Object object);
}
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