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Google App Engine compliant variation of FreeMarker. FreeMarker is a "template engine"; a generic tool to generate text output based on templates.

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/*
 * Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
 * 
 * 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 freemarker.ext.dom; 
 
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;

import freemarker.core.Environment;
import freemarker.template.TemplateHashModel;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import freemarker.template.utility.StringUtil;

/**
 * A class that wraps the root node of a parsed XML document, using
 * the W3C DOM API.
 */

class DocumentModel extends NodeModel implements TemplateHashModel {
    
    private ElementModel rootElement;
    
    DocumentModel(Document doc) {
        super(doc);
    }
    
    public String getNodeName() {
        return "@document";
    }
    
    public TemplateModel get(String key) throws TemplateModelException {
        if (key.equals("*")) {
            return getRootElement();
        }
        else if (key.equals("**")) {
            NodeList nl = ((Document)node).getElementsByTagName("*");
            return new NodeListModel(nl, this);
        }
        else if (StringUtil.isXMLID(key)) {
            ElementModel em = (ElementModel) NodeModel.wrap(((Document) node).getDocumentElement());
            if (em.matchesName(key, Environment.getCurrentEnvironment())) {
                return em;
            } else {
                return new NodeListModel(this);
            }
        }
        return super.get(key);
    }
    
    ElementModel getRootElement() {
        if (rootElement == null) {
            rootElement = (ElementModel) wrap(((Document) node).getDocumentElement());
        }
        return rootElement;
    }
    
    public boolean isEmpty() {
        return false;
    }
}