IndexChecker.java

/*
 * Copyright (c) www.bugull.com
 * 
 * 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 net.tooan.ynpay.third.mongodb.lucene.backend;

import net.tooan.ynpay.third.jfinal.log.Logger;
import net.tooan.ynpay.third.mongodb.cache.FieldsCache;
import net.tooan.ynpay.third.mongodb.exception.FieldException;
import net.tooan.ynpay.third.mongodb.lucene.annotations.*;

import java.lang.reflect.Field;

/**
 * @author Frank Wen(xbwen@hotmail.com)
 */
public class IndexChecker {

    private final static Logger logger = Logger.getLogger(IndexChecker.class);

    /**
     * Check a filed whether it has index annotation on it.
     *
     * @param clazz the class that field in
     * @param key   the field name
     * @return
     */
    public static boolean hasIndexAnnotation(Class<?> clazz, String key) {
        boolean result = false;
        //check if the key has "." in it
        int index = key.indexOf(".");
        if (index != -1) {
            key = key.substring(0, index);
        }
        Field field = null;
        try {
            field = FieldsCache.getInstance().getField(clazz, key);
        } catch (FieldException ex) {
            logger.error(ex.getMessage(), ex);
        }
        if (field.getAnnotation(IndexProperty.class) != null
                || field.getAnnotation(IndexEmbed.class) != null
                || field.getAnnotation(IndexEmbedList.class) != null
                || field.getAnnotation(IndexRef.class) != null
                || field.getAnnotation(IndexRefList.class) != null
                || field.getAnnotation(IndexRefBy.class) != null
                || field.getAnnotation(BoostSwitch.class) != null
                || field.getAnnotation(IndexFilter.class) != null) {
            result = true;
        }
        return result;
    }

    /**
     * Check whether the clazz need a lucene listener.
     * <p>If it has @Indexed annotation, or, some of it's fields has @IndexRefBy annotation,
     * then it need a lucene listener.</p>
     *
     * @param clazz
     * @return
     */
    public static boolean needListener(Class<?> clazz) {
        boolean result = false;
        if (clazz.getAnnotation(Indexed.class) != null) {
            result = true;
        } else {
            Field[] fields = FieldsCache.getInstance().get(clazz);
            for (Field f : fields) {
                IndexRefBy irb = f.getAnnotation(IndexRefBy.class);
                if (irb != null) {
                    result = true;
                    break;
                }
            }
        }
        return result;
    }

}