info.archinnov.achilles.entity.operations.CQLNativeQueryMapper Maven / Gradle / Ivy

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/**
 *
 * Copyright (C) 2012-2013 DuyHai DOAN
 *
 * 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 info.archinnov.achilles.entity.operations;

import info.archinnov.achilles.proxy.CQLRowMethodInvoker;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import com.datastax.driver.core.ColumnDefinitions;
import com.datastax.driver.core.ColumnDefinitions.Definition;
import com.datastax.driver.core.DataType;
import com.datastax.driver.core.Row;

public class CQLNativeQueryMapper {

	private CQLRowMethodInvoker cqlRowInvoker = new CQLRowMethodInvoker();

	public List> mapRows(List rows) {
		List> result = new ArrayList>();
		if (!rows.isEmpty()) {
			for (Row row : rows) {
				mapRow(result, row);
			}
		}
		return result;
	}

	private void mapRow(List> result, Row row) {
		ColumnDefinitions columnDefinitions = row.getColumnDefinitions();
		if (columnDefinitions != null) {
			Map line = new LinkedHashMap();
			for (Definition column : columnDefinitions) {
				mapColumn(row, line, column);
			}
			result.add(line);
		}
	}

	private void mapColumn(Row row, Map line, Definition column) {
		DataType type = column.getType();
		Class javaClass = type.asJavaClass();
		String name = column.getName();
		Object value;
		if (type.isCollection()) {
			List typeArguments = type.getTypeArguments();
			if (List.class.isAssignableFrom(javaClass)) {
				value = row.getList(name, typeArguments.get(0).asJavaClass());
			} else if (Set.class.isAssignableFrom(javaClass)) {
				value = row.getSet(name, typeArguments.get(0).asJavaClass());
			} else {
				value = row.getMap(name, typeArguments.get(0).asJavaClass(), typeArguments.get(1).asJavaClass());
			}
		} else {
			value = cqlRowInvoker.invokeOnRowForType(row, javaClass, name);
		}

		line.put(name, value);
	}
}