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/**
 * Original work: copyright 1999-2004 The Apache Software Foundation
 * (http://www.apache.org/)
 *
 * This project is based on the work 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.
 *
 * Modified work: copyright 2013-2022 Valery Silaev (http://vsilaev.com)
 *
 * 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.javaflow.spi;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;

/**
 * {@link ResourceTransformer} whose transformation is defined in terms of
 * multiple {@link ResourceTransformer}s.
 *
 * @author Kohsuke Kawaguchi
 */
public class CompositeResourceTransformer extends AbstractResourceTransformer {
    private final List transformers;

    public CompositeResourceTransformer(ResourceTransformer[] transformers) {
        this(Arrays.asList(transformers), false);
    }
    
    public CompositeResourceTransformer(List transformers) {
        this(transformers, true);
    }
    
    private CompositeResourceTransformer(List transformers, boolean makeCopy) {
        this.transformers = makeCopy ? makeCopy(transformers) : transformers;
    }

    public byte[] transform(byte[] image, Collection retransformClasses) {
        for (ResourceTransformer transformer : transformers) {
            byte[] result = transformer.transform(image, retransformClasses);
            if (null != result) {
                image = result;
            }
        }
        return image;
    }
    
    public void release() {
        for (ResourceTransformer transformer : transformers) {
            transformer.release();
        }
    }
    
    public static ResourceTransformationFactory composeFactories(ResourceTransformationFactory... factories) {
        return composeFactories(Arrays.asList(factories), false);
    }
    
    public static ResourceTransformationFactory composeFactories(final List factories) {
        return composeFactories(factories, true);
    }
    
    private static ResourceTransformationFactory composeFactories(final List originalFactories, boolean makeCopy) {
        final List factories = makeCopy ? makeCopy(originalFactories) : originalFactories;
        return new ResourceTransformationFactory() {
            
            @Override
            public ResourceTransformer createTransformer(ResourceLoader resourceLoader) {
                ResourceTransformer[] transformers = new ResourceTransformer[factories.size()];
                int idx = 0;
                for (ResourceTransformationFactory factory : factories) {
                    transformers[idx++] = factory.createTransformer(resourceLoader);
                }
                return new CompositeResourceTransformer(transformers);
            }
        };
    }
    
    private static  List makeCopy(List original) {
        return new ArrayList(original);
    }
}