/*
 * 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.ignite.internal.processors.query.calcite.exec;

import java.lang.reflect.Type;

import org.apache.ignite.internal.util.typedef.F;

/**
 * Handler for rows that implemented as a simple objects array.
 */
public class ArrayRowHandler implements RowHandler<Object[]> {
    /** */
    public static final RowHandler<Object[]> INSTANCE = new ArrayRowHandler();

    /** */
    private ArrayRowHandler() {}

    /** {@inheritDoc} */
    @Override public Object get(int field, Object[] row) {
        return row[field];
    }

    /** {@inheritDoc} */
    @Override public void set(int field, Object[] row, Object val) {
        row[field] = val;
    }

    /** {@inheritDoc} */
    @Override public Object[] concat(Object[] left, Object[] right) {
        return F.concat(left, right);
    }

    /** {@inheritDoc} */
    @Override public int columnCount(Object[] row) {
        return row.length;
    }

    /** {@inheritDoc} */
    @Override public RowFactory<Object[]> factory(Type... types) {
        int rowLen = types.length;

        return new RowFactory<Object[]>() {
            /** {@inheritDoc} */
            @Override public RowHandler<Object[]> handler() {
                return ArrayRowHandler.this;
            }

            /** {@inheritDoc} */
            @Override public Object[] create() {
                return new Object[rowLen];
            }

            /** {@inheritDoc} */
            @Override public Object[] create(Object... fields) {
                assert fields.length == rowLen;

                return fields;
            }
        };
    }
}
