org.javarosa.model.xform.DataModelSerializer Maven / Gradle / Ivy

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A Java library for rendering forms that are compliant with ODK XForms spec
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package org.javarosa.model.xform;


    /*
     * Copyright (C) 2009 JavaRosa
     *
     * 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.
     */



import java.io.IOException;
import java.io.OutputStream;

import org.javarosa.core.model.instance.AbstractTreeElement;
import org.javarosa.core.model.instance.DataInstance;
import org.javarosa.core.model.instance.InstanceInitializationFactory;
import org.javarosa.core.model.instance.TreeReference;
import org.kxml2.io.KXmlSerializer;

    /**
     * A quick rewrite of the basics for writing higher level xml documents straight to
     * output streams.
     *
     * @author Clayton Sims
     *
     */
    public class DataModelSerializer {

        KXmlSerializer serializer;
        InstanceInitializationFactory factory;

        public DataModelSerializer(OutputStream stream) throws IOException {
            this(stream, new InstanceInitializationFactory());
        }

        public DataModelSerializer(OutputStream stream, InstanceInitializationFactory factory) throws IOException {
            serializer = new KXmlSerializer();
            serializer.setOutput(stream, "UTF-8");
            this.factory = factory;
        }

        public DataModelSerializer(KXmlSerializer serializer) {
            this.serializer = serializer;
        }

        /*
         * (non-Javadoc)
         * @see org.javarosa.core.model.utils.ITreeVisitor#visit(org.javarosa.core.model.DataModelTree)
         */
        public void serialize(DataInstance instance, TreeReference base) throws IOException {
            //TODO: Namespaces?
            AbstractTreeElement root;
            if(base == null) {
                root = instance.getRoot();
            } else {
                root = instance.resolveReference(base);
            }

            //write root
            serializer.startTag(root.getNamespace(), root.getName());

            for (int i = 0; i< root.getNumChildren(); i++){
                //write children
                AbstractTreeElement childAt = root.getChildAt(i);
                serializeNode(childAt);
            }

            //end root
            serializer.endTag(root.getNamespace(), root.getName());
            serializer.flush();
        }

        public void serializeNode (AbstractTreeElement instanceNode) throws IOException {
            //don't serialize template nodes or non-relevant nodes
            if (!instanceNode.isRelevant() || instanceNode.getMult() == TreeReference.INDEX_TEMPLATE) {
                return;
            }

            serializer.startTag(instanceNode.getNamespace(), instanceNode.getName());
            for(int i = 0 ; i < instanceNode.getAttributeCount() ; ++i) {
                String val = instanceNode.getAttributeValue(i);
                val = val == null ? "" : val;
                serializer.attribute(instanceNode.getAttributeNamespace(i), instanceNode.getAttributeName(i), val);
            }

            if(instanceNode.getValue() != null) {
                serializer.text(instanceNode.getValue().uncast().getString());
            } else {
                for(int i = 0; i < instanceNode.getNumChildren(); ++i) {
                    serializeNode(instanceNode.getChildAt(i));
                }
            }

            serializer.endTag(instanceNode.getNamespace(), instanceNode.getName());
        }
}