org.broadleafcommerce.common.extensibility.context.merge.MergeXmlConfigResource Maven / Gradle / Ivy

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A collection of classes shared by broadleaf profile, cms, admin, and core.
There is a newer version: 3.1.15-GA
/*
 * #%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.broadleafcommerce.common.extensibility.context.merge;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.broadleafcommerce.common.extensibility.context.ResourceInputStream;
import org.broadleafcommerce.common.extensibility.context.merge.exceptions.MergeException;
import org.broadleafcommerce.common.extensibility.context.merge.exceptions.MergeManagerSetupException;
import org.springframework.beans.BeansException;
import org.springframework.beans.FatalBeanException;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.core.io.Resource;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

/**
 *
 * @author jfischer
 *
 */
public class MergeXmlConfigResource {

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

    public Resource getMergedConfigResource(ResourceInputStream[] sources) throws BeansException {
        Resource configResource = null;
        ResourceInputStream merged = null;
        try {
            merged = merge(sources);

            //read the final stream into a byte array
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            boolean eof = false;
            while (!eof) {
                int temp = merged.read();
                if (temp == -1) {
                    eof = true;
                } else {
                    baos.write(temp);
                }
            }
            configResource = new ByteArrayResource(baos.toByteArray());

            if (LOG.isDebugEnabled()) {
                LOG.debug("Merged config: \n" + serialize(configResource));
            }
        } catch (MergeException e) {
            throw new FatalBeanException("Unable to merge source and patch locations", e);
        } catch (MergeManagerSetupException e) {
            throw new FatalBeanException("Unable to merge source and patch locations", e);
        } catch (IOException e) {
            throw new FatalBeanException("Unable to merge source and patch locations", e);
        } finally {
            if (merged != null) {
                try{ merged.close(); } catch (Throwable e) {
                    LOG.error("Unable to merge source and patch locations", e);
                }
            }
        }

        return configResource;
    }

    protected ResourceInputStream merge(ResourceInputStream[] sources) throws MergeException, MergeManagerSetupException {
        if (sources.length == 1) return sources[0];

        ResourceInputStream response = null;
        ResourceInputStream[] pair = new ResourceInputStream[2];
        pair[0] = sources[0];
        for (int j=1;j