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Entity Mapping Addon JPA 2.1 compatible for DataStax Java Driver 3.0+ for Cassandra.

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/*
 *      Copyright (C) 2014 Eugene Valchkou.
 *
 *   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.datastax.driver.mapping.schemasync;

import java.nio.ByteBuffer;
import java.util.Iterator;

import com.datastax.driver.core.RegularStatement;
import com.datastax.driver.mapping.meta.EntityFieldMetaData;
import com.datastax.driver.mapping.meta.EntityTypeMetadata;

public class CreateTable extends RegularStatement {
	
	private static String CREATE_TABLE_TEMPLATE_CQL = "CREATE TABLE IF NOT EXISTS %s (%s PRIMARY KEY(%s))";
	private static String OPT_FIST = " WITH %s";
	private static String OPT_NEXT = " AND %s";
	
	final String keyspace;
	final EntityTypeMetadata entityMetadata;

	 CreateTable(String keyspace, EntityTypeMetadata entityMetadata) {
		this.keyspace = keyspace;
		this.entityMetadata = entityMetadata;
	}

	@Override
	public String getQueryString() {
	
		StringBuilder columns = new StringBuilder();
		for (EntityFieldMetaData fd: entityMetadata.getFields()) {
		    columns.append(fd.getColumnName());
		    columns.append(" ");
			if (fd.isGenericType()) {
				columns.append(fd.getGenericDef());
			} else {
				columns.append(fd.getDataType().toString());
			} 	
			if (fd.isStatic()) {
			    columns.append(" static");
			}
			columns.append(", ");
		}

		String pk = entityMetadata.getPkDefinition();
		String tableName = entityMetadata.getTableName();
		if (keyspace != null) {
			tableName = keyspace+ "." + tableName;
		}
		StringBuilder sb = new StringBuilder();
		sb.append(String.format(CREATE_TABLE_TEMPLATE_CQL, tableName, columns.toString(), pk));
		
		if (entityMetadata.getProperties() != null) {
			Iterator it  = entityMetadata.getProperties().iterator();

			if (it.hasNext()) {
				sb.append(String.format(OPT_FIST, it.next()));
			}
			
			while (it.hasNext()) {
				sb.append(String.format(OPT_NEXT, it.next()));
			}
		}

		return sb.toString();
	}

	@Override
	public ByteBuffer getRoutingKey() {
		return null;
	}

	@Override
	public String getKeyspace() {
		return keyspace;
	}

	@Override
	public ByteBuffer[] getValues(int protocolVersion) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public boolean hasValues() {
		// TODO Auto-generated method stub
		return false;
	}
	

}