/**
 * Copyright (c) 2009
 * Philipp Giese, Sven Wagner-Boysen
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package de.hpi.bpmn2_0.transformation;

import java.util.HashMap;
import java.util.Map;

import com.sun.xml.bind.marshaller.NamespacePrefixMapper;


/**
 * The namespace prefix mapper is responsible for the creation of user friendly
 * namespace prefixes in the BPMN 2.0 XML document. 
 * 
 * @author Sven Wagner-Boysen
 *
 */
public class BPMNPrefixMapper extends NamespacePrefixMapper {
	
	private Map<String,String> nsDefs;
	
	private static Map<String, String> customExtensions = new HashMap<String, String>();

	/* (non-Javadoc)
	 * @see com.sun.xml.bind.marshaller.NamespacePrefixMapper#getPreferredPrefix(java.lang.String, java.lang.String, boolean)
	 */
	// @Override
	public String getPreferredPrefix(String namespace, String suggestion, boolean isRequired) {
		
		/* BPMN 2.0 Standard Namespaces */
		if(namespace.equals("http://www.omg.org/spec/BPMN/20100524/MODEL")) 
			return "";
		else if(namespace.equals("http://www.omg.org/spec/BPMN/20100524/DI"))
			return "bpmndi";
		else if(namespace.equals("http://www.w3.org/2001/XMLSchema-instance"))
			return "xsi";
		else if(namespace.equals("http://www.omg.org/spec/DD/20100524/DI"))
			return "omgdi";
		else if(namespace.equals("http://www.omg.org/spec/DD/20100524/DC"))
			return "omgdc";
		
		/* Signavio */
		else if(namespace.equals("http://www.signavio.com"))
			return "signavio";
		
		/* Check custom extension */
		else if(getCustomExtensions().get(namespace) != null) {
			return getCustomExtensions().get(namespace);
		}
		
		/* Check namespace definitions from external XML elements */
		return getNsDefs().get(namespace);
		
	}
	
	public String[] getPreDeclaredNamespaceUris() {
		super.getPreDeclaredNamespaceUris();
		String[] s = {};
		return this.getNsDefs().keySet().toArray(s);
	}
	
	public static Map<String, String> getCustomExtensions() {
		
		Constants c = Diagram2BpmnConverter.getConstants();
		if(c == null) {
			return new HashMap<String, String>();
		}
		
		return new HashMap<String, String>(c.getCustomNamespacePrefixMappings());
	}

	/* Getter & Setter */
	
	public Map<String, String> getNsDefs() {
		if(nsDefs == null) {
			nsDefs = new HashMap<String, String>();
		}
		
		return nsDefs;
	}

	public void setNsDefs(Map<String, String> nsDefs) {
		this.nsDefs = nsDefs;
	}

}