com.impetus.kundera.metadata.processor.SuperColumnFamilyProcessor.java Source code

Introduction

Here is the source code for com.impetus.kundera.metadata.processor.SuperColumnFamilyProcessor.java

Source

/*
 * Copyright 2010 Impetus Infotech.
 *
 * 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 com.impetus.kundera.metadata.processor;

import java.lang.reflect.Field;

import javax.persistence.EntityManagerFactory;
import javax.persistence.Id;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.impetus.kundera.api.SuperColumn;
import com.impetus.kundera.api.SuperColumnFamily;
import com.impetus.kundera.ejb.EntityManagerFactoryImpl;
import com.impetus.kundera.metadata.EntityMetadata;

/**
 * The Class SuperColumnFamilyMetadataProcessor.
 * 
 * @author animesh.kumar
 */
public class SuperColumnFamilyProcessor extends AbstractEntityFieldProcessor {

    /** The Constant log. */
    private static final Log LOG = LogFactory.getLog(SuperColumnFamilyProcessor.class);

    /** The em. */
    private EntityManagerFactoryImpl em;

    /**
     * Instantiates a new super column family processor.
     * 
     * @param em
     *            the em
     */
    public SuperColumnFamilyProcessor(EntityManagerFactory em) {
        this.em = (EntityManagerFactoryImpl) em;
    }

    /*
     * @see
     * com.impetus.kundera.metadata.MetadataProcessor#process(java.lang.Class,
     * com.impetus.kundera.metadata.EntityMetadata)
     */
    @Override
    public final void process(Class<?> clazz, EntityMetadata metadata) {

        if (!clazz.isAnnotationPresent(SuperColumnFamily.class)) {
            return;
        }

        LOG.debug("Processing @Entity " + clazz.getName() + " for SuperColumnFamily.");

        metadata.setType(EntityMetadata.Type.SUPER_COLUMN_FAMILY);

        // check for SuperColumnFamily annotation.
        SuperColumnFamily scf = clazz.getAnnotation(SuperColumnFamily.class);

        // set columnFamily
        metadata.setColumnFamilyName(scf.family());

        // set keyspace
        String keyspace = scf.keyspace().length() != 0 ? scf.keyspace() : em.getKeyspace();
        metadata.setKeyspaceName(keyspace);

        // scan for fields
        for (Field f : clazz.getDeclaredFields()) {

            // if @Id
            if (f.isAnnotationPresent(Id.class)) {
                LOG.debug(f.getName() + " => Id");
                metadata.setIdProperty(f);
                populateIdAccessorMethods(metadata, clazz, f);
            }
            // if @SuperColumn
            else if (f.isAnnotationPresent(SuperColumn.class)) {
                SuperColumn sc = f.getAnnotation(SuperColumn.class);
                String superColumnName = sc.column();

                String columnName = getValidJPAColumnName(clazz, f);
                if (null == columnName) {
                    continue;
                }
                LOG.debug(f.getName() + " => Column:" + columnName + ", SuperColumn:" + superColumnName);

                EntityMetadata.SuperColumn superColumn = metadata.getSuperColumn(superColumnName);
                if (null == superColumn) {
                    superColumn = metadata.new SuperColumn(superColumnName);
                }
                superColumn.addColumn(columnName, f);
                metadata.addSuperColumn(superColumnName, superColumn);

            }
        }
    }
}