org.milyn.edisax.registry.AbstractMappingsRegistry Maven / Gradle / Ivy
/*
* Milyn - Copyright (C) 2006 - 2011
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License (version 2.1) as published by the Free Software
* Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* See the GNU Lesser General Public License for more details:
* http://www.gnu.org/licenses/lgpl.txt
*/
package org.milyn.edisax.registry;
import java.io.IOException;
import java.util.LinkedHashMap;
import java.util.Map;
import org.milyn.edisax.EDIConfigurationException;
import org.milyn.edisax.model.EdifactModel;
import org.milyn.edisax.model.internal.Delimiters;
import org.milyn.edisax.util.EDIUtils;
import org.xml.sax.SAXException;
/**
* Base implementation of {@link MappingsRegistry} interface
*
* @author zubairov
*
*/
public abstract class AbstractMappingsRegistry implements MappingsRegistry {
/**
* Internal storage
*/
protected final Map content = new LinkedHashMap();
/**
* {@inheritDoc}
*/
public EdifactModel getMappingModel(String messageName,
Delimiters delimiters) throws EDIConfigurationException, SAXException, IOException {
String[] nameComponents = EDIUtils.split(messageName,
delimiters.getComponent(), delimiters.getEscape());
StringBuilder lookupNameBuilder = new StringBuilder();
// First 4 components are mandatory...we use those as the lookup...
for (int i = 0; i < 4; i++) {
if (i > 0) {
lookupNameBuilder.append(':');
}
lookupNameBuilder.append(nameComponents[i]);
}
String lookupName = lookupNameBuilder.toString().trim();
EdifactModel result = content.get(lookupName);
if (result == null) {
synchronized (content) {
result = content.get(lookupName);
if (result == null) {
content.putAll(demandLoading(nameComponents));
}
}
// Try again
result = content.get(lookupName);
if (result != null) {
return result;
}
} else {
return result;
}
throw new EDIConfigurationException("Mapping Model '" + messageName
+ "' not found in supplied set of Mapping model.");
}
/**
* Loading mapping models on demand.
* This method should return either one or many mapping models
* loaded on-demand or just eagerly.
*
* @param nameComponents
* @return
* @throws SAXException
* @throws IOException
* @throws EDIConfigurationException
*/
protected abstract Map demandLoading(String[] nameComponents) throws EDIConfigurationException, IOException, SAXException;
}