XSLViewResolver.java

/**
 * Copyright 2008 The University of North Carolina at Chapel Hill
 *
 * 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 edu.unc.lib.dl.ui.view;

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

import javax.xml.transform.TransformerException;

import org.jdom2.Document;
import org.jdom2.Element;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import edu.unc.lib.dl.ui.exception.RenderViewException;

public class XSLViewResolver {
	private static final Logger LOG = LoggerFactory.getLogger(XSLViewResolver.class);
	
	Map<String,XSLComponentView> views;
	
	public XSLViewResolver() {
		views = new HashMap<String,XSLComponentView>();
	}
	
	public void setViews(Map<String,String> views){
		for (Map.Entry<String, String> viewPair: views.entrySet()){
			try {
				XSLComponentView view = new XSLComponentView(viewPair.getValue());
				if (view != null){
					view.initializeTransformer();
					this.views.put(viewPair.getKey(), view);
				}
			} catch (Exception e){
				LOG.error("Failed to construct XSLComponentView " + viewPair.getKey() + " from source " + viewPair.getValue(), e);
			}
		}
	}
	
	public void refreshViews() {
		for (XSLComponentView view: views.values()){
			try {
				view.initializeTransformer();
			} catch (Exception e){
				LOG.error("Failed to refresh XSLComponentView from source " + view.getSource(), e);
			}
		}
	}
	
	public String renderView(String key, Element doc, Map<String,Object> parameters) throws RenderViewException {
		if (key == null || !views.containsKey(key))
			throw new RenderViewException("The view " + key + " was requested but is not bound");
		try {
			return views.get(key).renderView(doc, parameters);
		} catch (TransformerException e) {
			throw new RenderViewException("Failed to transform the document to the specified view " + key, e);
		}
	}
	
	public String renderView(String key, Element doc) throws RenderViewException {
		return renderView(key, doc, null);
	}
	
	public String renderView(String key, Document doc) throws RenderViewException {
		return renderView(key, doc.getRootElement(), null);
	}
}