src/com/google/inject/intercept/Query.java

/**
 * Copyright (C) 2006 Google Inc.
 *
 * 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.inject.intercept;

/**
 * Returns {@code true} or {@code false} for a given input.
 *
 * @author crazybob@google.com (Bob Lee)
 */
public interface Query<T> {

  /**
   * Returns {@code true} if this query matches {@code t}, {@code false}
   * otherwise.
   */
  boolean matches(T t);

  /**
   * Returns a query which returns {@code true} if both this and the given
   * query return {@code true}.
   */
  Query<T> and(Query<? super T> other);

  /**
   * Returns a query which returns {@code true} if either this or the given
   * query return {@code true}.
   */
  Query<T> or(Query<? super T> other);
}