/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate 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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.data;

import com.google.common.base.MoreObjects;

import java.util.Iterator;

public class ArrayBucket implements Bucket {

    private final Object[][] rows;
    private final int numColumns;

    /**
     * Constructs a new ArrayBucket with rows of the given size, regardless of what length the row arrays is.
     *
     * @param rows       the backing array of this bucket
     * @param numColumns the size of rows emitted from this bucket
     */
    public ArrayBucket(Object[][] rows, int numColumns) {
        this.rows = rows;
        this.numColumns = numColumns;
    }

    public ArrayBucket(Object[][] rows) {
        this.rows = rows;
        if (rows.length > 0) {
            numColumns = rows[0].length;
        } else {
            numColumns = -1;
        }
    }

    @Override
    public int size() {
        return rows.length;
    }

    @Override
    public Iterator<Row> iterator() {
        return new Iterator<Row>() {
            int pos = 0;
            final RowN row = new RowN(numColumns);

            @Override
            public boolean hasNext() {
                return pos < rows.length;
            }

            @Override
            public Row next() {
                row.cells(rows[pos++]);
                return row;
            }

            @Override
            public void remove() {

            }
        };
    }

    @Override
    public String toString() {
        return MoreObjects.toStringHelper(this)
            .add("numRows", size())
            .add("numColumns", numColumns)
            .toString();
    }
}