/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.tuscany.sca.domain.search.impl;

import javax.xml.namespace.QName;

import org.apache.lucene.document.Field;
import org.apache.tuscany.sca.assembly.Component;
import org.apache.tuscany.sca.assembly.Composite;
import org.apache.tuscany.sca.domain.search.DocumentMap;
import org.apache.tuscany.sca.domain.search.DocumentProcessor;

/**
 * 
 * @version $Rev$ $Date$
 */
public class CompositeDocumentProcessor implements DocumentProcessor {

    public Document process(DocumentProcessor parentProcessor,
                            DocumentMap documents,
                            Object object,
                            Document doc,
                            String parent) {

        if (object instanceof Composite) {
            Composite composite = (Composite)object;
            QName name = composite.getName();
            String uri = (name == null ? "" : name.getNamespaceURI() + ';' + name.getLocalPart());

            if (uri.length() == 0) {
                uri = null;

            } else if (doc == null) {
                doc = documents.get(uri);
            }

            if (uri != null) {
                parent +=
                    DomainPathAnalyzer.PATH_SEPARATOR + SearchFields.COMPOSITE_FIELD
                        + DomainPathAnalyzer.TYPE_SEPARATOR
                        + uri;
            }

            for (Component component : composite.getComponents()) {

                Document componentDoc = parentProcessor.process(parentProcessor, documents, component, null, parent);

                if (uri != null) {

                    componentDoc
                        .add(new Field(SearchFields.PARENT_FIELD, parent, Field.Store.YES, Field.Index.ANALYZED));

                }

            }

            if (uri != null) {

                doc.add(new Field(SearchFields.COMPOSITE_FIELD, uri, Field.Store.YES, Field.Index.ANALYZED));

            }

            for (Composite include : composite.getIncludes()) {
                Document compositeDoc = parentProcessor.process(parentProcessor, documents, include, null, parent);

                if (uri != null) {

                    compositeDoc.add(new Field(SearchFields.INCLUDEDBY_FIELD, uri, Field.Store.YES,
                                               Field.Index.ANALYZED));

                }

            }

            for (Component component : composite.getComponents()) {
                Document componentDoc = parentProcessor.process(parentProcessor, documents, component, null, parent);

                if (uri != null) {

                    componentDoc
                        .add(new Field(SearchFields.PARENT_FIELD, parent, Field.Store.YES, Field.Index.ANALYZED));

                }

            }

            return doc == null ? FAKE_DOCUMENT : doc;

        }

        throw new IllegalArgumentException();

    }

    public Object getDocumentKey(Object object) {

        if (object instanceof Composite) {
            Composite composite = (Composite)object;
            String uri = composite.getURI();
            QName name = composite.getName();

            uri = (uri == null ? "" : uri) + (name == null ? "" : name.toString());

            return uri.length() == 0 ? null : uri;

        }

        throw new IllegalArgumentException();

    }

}