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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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 com.feilong.lib.collection4.functors;

import java.io.Serializable;

import org.apache.commons.collections4.Predicate;

/**
 * Predicate implementation that returns true if the input is an instanceof
 * the type stored in this predicate.
 *
 * @since 3.0
 */
public final class InstanceofPredicate implements Predicate,Serializable{

    /** Serial version UID */
    private static final long serialVersionUID = -6682656911025165584L;

    /** The type to compare to */
    private final Class    iType;

    /**
     * Factory to create the identity predicate.
     *
     * @param type
     *            the type to check for, may not be null
     * @return the predicate
     * @throws NullPointerException
     *             if the class is null
     */
    public static Predicate instanceOfPredicate(final Class type){
        if (type == null){
            throw new NullPointerException("The type to check instanceof must not be null");
        }
        return new InstanceofPredicate(type);
    }

    /**
     * Constructor that performs no validation.
     * Use instanceOfPredicate if you want that.
     *
     * @param type
     *            the type to check for
     */
    public InstanceofPredicate(final Class type){
        super();
        iType = type;
    }

    /**
     * Evaluates the predicate returning true if the input object is of the correct type.
     *
     * @param object
     *            the input object
     * @return true if input is of stored type
     */
    @Override
    public boolean evaluate(final Object object){
        return iType.isInstance(object);
    }

    /**
     * Gets the type to compare to.
     *
     * @return the type
     * @since 3.1
     */
    public Class getType(){
        return iType;
    }

}
 















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