org.alloy.metal.xml.merge.DynamicResourceIterator.java Source code

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Here is the source code for org.alloy.metal.xml.merge.DynamicResourceIterator.java

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/*
* #%L
* BroadleafCommerce Common Libraries
* %%
* Copyright (C) 2009 - 2013 Broadleaf Commerce
* %%
* 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.
* #L%
*/

package org.alloy.metal.xml.merge;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collection;

import org.alloy.metal.resource.ResourceInputStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
* This class serves as a basic iterator for a list of source files to be
* merged. The interesting part, however, is that additional resources
* may be inserted at any time at the current iterator position.
*
* @author Jeff Fischer
*/
public class DynamicResourceIterator extends ArrayList<ResourceInputStream> {
    private static final long serialVersionUID = -349864141648037L;

    private static final Log LOG = LogFactory.getLog(DynamicResourceIterator.class);

    private int position = 0;
    private int embeddedInsertPosition = 0;

    public ResourceInputStream nextResource() {
        ResourceInputStream ris = get(position);
        position++;
        embeddedInsertPosition = position;
        return ris;
    }

    public int getPosition() {
        return position;
    }

    public void addEmbeddedResource(ResourceInputStream ris) {
        if (embeddedInsertPosition == size()) {
            add(ris);
        } else {
            add(embeddedInsertPosition, ris);
        }
        embeddedInsertPosition++;
    }

    public boolean hasNext() {
        return position < size();
    }

    @Override
    public boolean add(ResourceInputStream resourceInputStream) {
        byte[] sourceArray;
        try {
            sourceArray = buildArrayFromStream(resourceInputStream);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        ResourceInputStream ris = new ResourceInputStream(new ByteArrayInputStream(sourceArray), null,
                resourceInputStream.getNames());
        return super.add(ris);
    }

    @Override
    public boolean addAll(Collection<? extends ResourceInputStream> c) {
        for (ResourceInputStream ris : c) {
            if (!add(ris)) {
                return false;
            }
        }
        return true;
    }

    @Override
    public void add(int index, ResourceInputStream resourceInputStream) {
        byte[] sourceArray;
        try {
            sourceArray = buildArrayFromStream(resourceInputStream);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        ResourceInputStream ris = new ResourceInputStream(new ByteArrayInputStream(sourceArray), null,
                resourceInputStream.getNames());
        super.add(index, ris);
    }

    protected byte[] buildArrayFromStream(InputStream source) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        boolean eof = false;
        try {
            while (!eof) {
                int temp = source.read();
                if (temp == -1) {
                    eof = true;
                } else {
                    baos.write(temp);
                }
            }
        } finally {
            try {
                source.close();
            } catch (Throwable e) {
                LOG.error("Unable to merge source and patch locations", e);
            }
        }

        return baos.toByteArray();
    }
}