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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 org.apache.commons.collections.functors;

import java.io.Serializable;
import org.apache.commons.collections.Closure;
import org.apache.commons.collections.Transformer;

/**
 *  Transformer implementation that calls a Closure using the input object
 *  and then returns the input.
 *
 *  @since Commons Collections 3.0
 *  @version $Revision$ $Date$
 *
 *  @author Stephen Colebourne
 *
 * @deprecated Apache Commons Collections version 3.x is being deprecated from AEMaaCS. The upgraded version 4.4 of Commons Collections is already included as replacement. Customers are advised to upgrade to this version of the library. Please note: the package name was changed to org.apache.commons.collections4. Further note that there are AEM APIs currently exposing the old collections classes; these will be updated in upcoming releases.
 */
@Deprecated(since = "2021-04-30")
public class ClosureTransformer implements Transformer, Serializable {

    /**
     * Serial version UID
     */
    private static final long serialVersionUID = 478466901448617286L;

    /**
     * The closure to wrap
     */
    private final Closure iClosure;

    /**
     * Factory method that performs validation.
     *
     * @param closure  the closure to call, not null
     * @return the closure transformer
     * @throws IllegalArgumentException if the closure is null
     */
    public static Transformer getInstance(Closure closure) {
        if (closure == null) {
            throw new IllegalArgumentException("Closure must not be null");
        }
        return new ClosureTransformer(closure);
    }

    /**
     * Constructor that performs no validation.
     * Use getInstance if you want that.
     *
     * @param closure  the closure to call, not null
     */
    public ClosureTransformer(Closure closure) {
        super();
        iClosure = closure;
    }

    /**
     * Transforms the input to result by executing a closure.
     *
     * @param input  the input object to transform
     * @return the transformed result
     */
    public Object transform(Object input) {
        iClosure.execute(input);
        return input;
    }

    /**
     * Gets the closure.
     *
     * @return the closure
     * @since Commons Collections 3.1
     */
    public Closure getClosure() {
        return iClosure;
    }
}