src/main/java/freemarker/ext/dom/ElementModel.java

/*
 * Copyright (c) 2003 The Visigoth Software Society. All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Visigoth Software Society (http://www.visigoths.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
 *
 * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
 *    project contributors may be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact visigoths@visigoths.org.
 *
 * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
 *    nor may "FreeMarker" or "Visigoth" appear in their names
 *    without prior written permission of the Visigoth Software Society.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Visigoth Software Society. For more
 * information on the Visigoth Software Society, please see
 * http://www.visigoths.org/
 */
 
package freemarker.ext.dom;

import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import freemarker.core.Environment;
import freemarker.template.SimpleScalar;
import freemarker.template.Template;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import freemarker.template.TemplateScalarModel;
import freemarker.template.TemplateSequenceModel;
import freemarker.template.utility.StringUtil;

class ElementModel extends NodeModel implements TemplateScalarModel {
    
    public ElementModel(Element element) {
        super(element);
    }
    
    public boolean isEmpty() {
        return false;
    }
    
    /**
     * An Element node supports various hash keys.
     * Any key that corresponds to the tag name of any child elements
     * returns a sequence of those elements. The special key "*" returns 
     * all the element's direct children.
     * The "**" key return all the element's descendants in the order they
     * occur in the document.
     * Any key starting with '@' is taken to be the name of an element attribute.
     * The special key "@@" returns a hash of all the element's attributes.
     * The special key "/" returns the root document node associated with this element.
     */
    public TemplateModel get(String key) throws TemplateModelException {
        if (key.equals("*")) {
            NodeListModel ns = new NodeListModel(this);
            TemplateSequenceModel children = getChildNodes();
            for (int i=0;i < children.size();i++) {
                NodeModel child = (NodeModel) children.get(i);
                if (child.node.getNodeType() == Node.ELEMENT_NODE) {
                    ns.add(child);
                }
            }
            return ns;
        }
        if (key.equals("**")) {
            Element elem = (Element) node;
            return new NodeListModel(elem.getElementsByTagName("*"), this);    
        }
        if (key.startsWith("@")) {
            if (key.equals("@@") || key.equals("@*")) {
                return new NodeListModel(node.getAttributes(), this);
            }
            if (key.equals("@@start_tag")) {
                NodeOutputter nodeOutputter = new NodeOutputter(node);
                return new SimpleScalar(nodeOutputter.getOpeningTag((Element) node));
            }
            if (key.equals("@@end_tag")) {
                NodeOutputter nodeOutputter = new NodeOutputter(node);
                return new SimpleScalar(nodeOutputter.getClosingTag((Element) node));
            }
            if (key.equals("@@attributes_markup")) {
                StringBuffer buf = new StringBuffer();
                NodeOutputter nu = new NodeOutputter(node);
                nu.outputContent(node.getAttributes(), buf);
                return new SimpleScalar(buf.toString().trim());
            }
            if (StringUtil.isXMLID(key.substring(1))) {
                Attr att = getAttribute(key.substring(1));
                if (att == null) { 
                    return new NodeListModel(this);
                }
                return wrap(att);
            }
        }
        if (StringUtil.isXMLID(key)) {
            NodeListModel result = ((NodeListModel) getChildNodes()).filterByName(key);
            if (result.size() == 1) {
                return result.get(0);
            }
            return result;
        }
        return super.get(key);
    }

    public String getAsString() throws TemplateModelException {
        NodeList nl = node.getChildNodes();
        String result = "";
        for (int i = 0; i<nl.getLength(); i++) {
            Node child = nl.item(i);
            int nodeType = child.getNodeType();
            if (nodeType == Node.ELEMENT_NODE) {
                String msg = "Only elements with no child elements can be processed as text."
                             + "\nThis element with name \""
                             + node.getNodeName()
                             + "\" has a child element named: " + child.getNodeName();
                throw new TemplateModelException(msg);
            }
            else if (nodeType == Node.TEXT_NODE || nodeType == Node.CDATA_SECTION_NODE) {
                result += child.getNodeValue();
            }
        }
        return result;
    }
    
    public String getNodeName() {
        String result = node.getLocalName();
        if (result == null || result.equals("")) {
            result = node.getNodeName();
        }
        return result;
    }
    
    String getQualifiedName() {
        String nodeName = getNodeName();
        String nsURI = getNodeNamespace();
        if (nsURI == null || nsURI.length() == 0) {
            return nodeName;
        }
        Environment env = Environment.getCurrentEnvironment();
        String defaultNS = env.getDefaultNS();
        String prefix;
        if (defaultNS != null && defaultNS.equals(nsURI)) {
            prefix = Template.DEFAULT_NAMESPACE_PREFIX;
        } else {
            prefix = env.getPrefixForNamespace(nsURI);
            
        }
        if (prefix == null) {
            return null; // We have no qualified name, because there is no prefix mapping
        }
        if (prefix.length() >0) {
            prefix += ":";
        }
        return prefix + nodeName;
    }
    
    private Attr getAttribute(String qname) {
        Element element = (Element) node;
        Attr result = element.getAttributeNode(qname);
        if (result != null)
            return result;
        int colonIndex = qname.indexOf(':');
        if (colonIndex >0) {
            String prefix = qname.substring(0, colonIndex);
            String uri;
            if (prefix.equals(Template.DEFAULT_NAMESPACE_PREFIX)) {
                uri = Environment.getCurrentEnvironment().getDefaultNS();
            } else {
                uri = Environment.getCurrentEnvironment().getNamespaceForPrefix(prefix);
            }
            String localName = qname.substring(1+colonIndex);
            if (uri != null) {
                result = element.getAttributeNodeNS(uri, localName);
            }
        }
        return result;
    }
    
    boolean matchesName(String name, Environment env) {
        return StringUtil.matchesName(name, getNodeName(), getNodeNamespace(), env);
    }
}