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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 java.util.ArrayList;
import java.util.List;

import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import freemarker.core.Environment;
import freemarker.core._UnexpectedTypeErrorExplainerTemplateModel;
import freemarker.template.ObjectWrapper;
import freemarker.template.SimpleScalar;
import freemarker.template.SimpleSequence;
import freemarker.template.TemplateBooleanModel;
import freemarker.template.TemplateDateModel;
import freemarker.template.TemplateHashModel;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import freemarker.template.TemplateNumberModel;
import freemarker.template.TemplateScalarModel;
import freemarker.template.TemplateSequenceModel;
import freemarker.template.utility.StringUtil;

class NodeListModel extends SimpleSequence implements TemplateHashModel, _UnexpectedTypeErrorExplainerTemplateModel {
    
    NodeModel contextNode;
    XPathSupport xpathSupport;
    
    private static ObjectWrapper nodeWrapper = new ObjectWrapper() {
        public TemplateModel wrap(Object obj) {
            if (obj instanceof NodeModel) {
                return (NodeModel) obj;
            }
            return NodeModel.wrap((Node) obj);
        }
    };
    
    NodeListModel(Node node) {
        this(NodeModel.wrap(node));
    }
    
    NodeListModel(NodeModel contextNode) {
        super(nodeWrapper);
        this.contextNode = contextNode;
    }
    
    NodeListModel(NodeList nodeList, NodeModel contextNode) {
        super(nodeWrapper);
        for (int i=0; i0) {
                xpathSupport = ((NodeModel) get(0)).getXPathSupport();
            }
        }
        return xpathSupport;
    }

    public Object[] explainTypeError(Class[] expectedClasses) {
        for (int i = 0; i < expectedClasses.length; i++) {
            Class expectedClass = expectedClasses[i];
            if (TemplateScalarModel.class.isAssignableFrom(expectedClass)
                    || TemplateDateModel.class.isAssignableFrom(expectedClass)
                    || TemplateNumberModel.class.isAssignableFrom(expectedClass)
                    || TemplateBooleanModel.class.isAssignableFrom(expectedClass)) {
                return new Object[] {
                        "This XML query result can't be used as string because for that it had to contain exactly "
                        + "1 XML node, but it contains ", new Integer(size()), " nodes. "
                        + "That is, the constructing XML query has found ",
                        isEmpty()
                            ? "no matches."
                            : "multiple matches."
                        };
            }
        }
        return null;
    }
    
}