src/main/java/net/hydromatic/linq4j/function/Predicate1.java

/*
// Licensed to Julian Hyde under one or more contributor license
// agreements. See the NOTICE file distributed with this work for
// additional information regarding copyright ownership.
//
// Julian Hyde licenses this file to you 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 net.hydromatic.linq4j.function;

/**
 * Function with one parameter returning a native {@code boolean} value.
 *
 * @param <T0> Type of argument #0
 */
public interface Predicate1<T0> extends Function<Boolean> {
  /**
   * Predicate that always evaluates to {@code true}.
   *
   * @see Functions#truePredicate1()
   */
  Predicate1<Object> TRUE = new Predicate1<Object>() {
    public boolean apply(Object v0) {
      return true;
    }
  };

  /**
   * Predicate that always evaluates to {@code false}.
   *
   * @see Functions#falsePredicate1()
   */
  Predicate1<Object> FALSE = new Predicate1<Object>() {
    public boolean apply(Object v0) {
      return false;
    }
  };

  boolean apply(T0 v0);
}

// End Predicate1.java