predicate.java

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/*
 * Copyright 1999-2004 The Apache Software Foundation
 *
 * 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 org.apache.commons.collections;

/** Performs some predicate which returns true or false based on the input object.
  * Predicate instances can be used to implement queries or to do filtering.
  *
  * @since 1.0
  * @author <a href="mailto:[e-mail]">James Strachan</a>
  */
public interface Predicate {

    /**
      *  Returns true if the input object matches this predicate. 
      *
      * @return true if the input object matches this predicate, else returns false
      */
    public boolean evaluate(Object input);
}