/**
 * 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.lucene.gdata.search.analysis;

import javax.xml.xpath.XPathExpressionException;

import org.apache.lucene.document.Field;
import org.apache.lucene.gdata.data.ServerBaseEntry;
import org.apache.lucene.gdata.search.config.IndexSchemaField;
import org.apache.lucene.gdata.search.config.IndexSchemaField.ContentType;
import org.w3c.dom.Node;

/**
 * @author Simon Willnauer
 * 
 */
public class MixedContentStrategy extends ContentStrategy {
    protected ContentStrategy strategy;

    protected MixedContentStrategy(IndexSchemaField fieldConfiguration) {
        super(fieldConfiguration);

    }

    /**
     * @throws NotIndexableException
     * @see org.apache.lucene.gdata.search.analysis.ContentStrategy#processIndexable(org.apache.lucene.gdata.search.analysis.Indexable)
     */
    @Override
    public void processIndexable(
            Indexable<? extends Node, ? extends ServerBaseEntry> indexable)
            throws NotIndexableException {
        String path = this.config.getTypePath();

        try {
            Node node = indexable.applyPath(path);
            if (node == null)
                this.strategy = new PlainTextStrategy(this.config);
            else {
                String contentType = node.getTextContent();

                this.strategy = chooseStrategy(contentType, this.config);
            }
            this.strategy.processIndexable(indexable);
        } catch (XPathExpressionException e) {
            throw new NotIndexableException("Can not apply path -- " + path);

        }
    }
    
    /**
     * @see org.apache.lucene.gdata.search.analysis.ContentStrategy#createLuceneField()
     */
    @Override
    public Field[] createLuceneField() {
        
        return this.strategy.createLuceneField();
    }

    private static ContentStrategy chooseStrategy(final String contentType,
            final IndexSchemaField config) {
        ContentType type = null;
        try {
            type = ContentType.valueOf(contentType==null?"TEXT":contentType.toUpperCase());
        } catch (Throwable e) {
            type = ContentType.TEXT;
        }

        switch (type) {
        case HTML:
            return new HTMLStrategy(config);

        case XHTML:
            return new XHtmlStrategy(config);

        default:
            return new PlainTextStrategy(config);

        }
    }

}