core/src/main/java/org/apache/hop/core/SingleRowRowSet.java

/*
 * 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.hop.core;

import java.util.concurrent.TimeUnit;
import org.apache.hop.core.row.IRowMeta;

/**
 * A simplified rowset for transforms that always only need to only have a single row on input...
 */
public class SingleRowRowSet extends BaseRowSet implements Comparable<IRowSet>, IRowSet {

  private Object[] row;

  @Override
  public Object[] getRow() {
    Object[] retRow = row;
    row = null;
    return retRow;
  }

  @Override
  public Object[] getRowImmediate() {
    return getRow();
  }

  @Override
  public Object[] getRowWait(long timeout, TimeUnit tu) {
    return getRow();
  }

  @Override
  public boolean putRow(IRowMeta rowMeta, Object[] rowData) {
    this.rowMeta = rowMeta;
    this.row = rowData;
    return true;
  }

  @Override
  public boolean putRowWait(IRowMeta rowMeta, Object[] rowData, long time, TimeUnit tu) {
    return putRow(rowMeta, rowData);
  }

  @Override
  public int size() {
    return row == null ? 0 : 1;
  }

  @Override
  public void clear() {
    row = null;
    done.set(false);
  }
}