ModelItemClonerXstreamImpl.java

/**
 * Copyright (C) 2015 Orange
 * 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 com.francetelecom.clara.cloud.deployment.common.service;

import com.francetelecom.clara.cloud.commons.UUIDUtils;
import com.francetelecom.clara.cloud.commons.xstream.XStreamUtils;
import com.francetelecom.clara.cloud.deployment.technical.service.ModelItemCloner;
import com.thoughtworks.xstream.XStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.regex.Pattern;

/**
 * Technical Deployment duplication factory. Takes a complete TD, and create a
 * transient detached copy - adjsting name with a prefix (all ModelItemName) to
 * avoid unique constraint conflict - resetting id and version
 * 
 * Impl is based on xstream marshalling + regex pattern + xstream unmarshalling
 * 
 * 
 * @author APOG7416
 * 
 */
public class ModelItemClonerXstreamImpl<T> implements ModelItemCloner<T> {

	private static Logger logger = LoggerFactory.getLogger(ModelItemClonerXstreamImpl.class.getName());

	private static Logger loggerDump = LoggerFactory.getLogger("com.francetelecom.clara.cloud.dump");
	
	// generated by init methods
	private final XStream xStream = XStreamUtils.instanciateXstreamForHibernate();

    @Override
    public T deepCopy(T original) {
        String xmlDump = dumpToXml(original);
        return preprocessAndImportDump(xmlDump);
    }

    public String dumpToXml(T original) {
        logger.debug("duplicating model " + original);

        return xStream.toXML(original);
    }

    public T preprocessAndImportDump(String xmlDump) {
        if (loggerDump.isDebugEnabled()) {
            loggerDump.debug("original : \n " + xmlDump);
        }

        String namePattern = "\\<name\\>.*\\<\\/name\\>";
        String idPattern = "\\<id\\>[0-9]*\\<\\/id\\>";
        String versionPattern = "\\<version\\>[0-9]*\\<\\/version\\>";

        String[] splitString = xmlDump.split(namePattern);
        StringBuffer transformedXml = new StringBuffer();
        int index = 0;
        for (String part : splitString) {
            transformedXml.append(part);
            if (index != splitString.length - 1) {
                transformedXml.append("<name>");
                transformedXml.append(UUIDUtils.generateUUID());
                transformedXml.append("</name>");
            }
            index++;
        }
        if (loggerDump.isDebugEnabled()) {
            loggerDump.debug(xmlDump);
            loggerDump.debug(transformedXml.toString());
        }
        // String transformedXml=
        // Pattern.compile(namePattern).matcher(xmlDump).replaceAll("\\<name\\>"
        // + UUID.randomUUID() + "\\<\\/name\\>");
        assert !transformedXml.equals(xmlDump) : "expected at least one name to be replaced";
        String transformedXml2 = Pattern.compile(idPattern).matcher(transformedXml).replaceAll("<id>0</id>");
        String transformedXml3 = Pattern.compile(versionPattern).matcher(transformedXml2).replaceAll("<version>0</version>");

        if (loggerDump.isDebugEnabled()) {
            loggerDump.debug("transformed : \n " + transformedXml3);
        }
        // back to TechnicalDeployment
        return (T) xStream.fromXML(transformedXml3);
    }

}