    001/*
    002 * Copyright (c) 2007-2016 Concurrent, Inc. All Rights Reserved.
    003 *
    004 * Project and contact information: http://www.cascading.org/
    005 *
    006 * This file is part of the Cascading project.
    007 *
    008 * Licensed under the Apache License, Version 2.0 (the "License");
    009 * you may not use this file except in compliance with the License.
    010 * You may obtain a copy of the License at
    011 *
    012 *     http://www.apache.org/licenses/LICENSE-2.0
    013 *
    014 * Unless required by applicable law or agreed to in writing, software
    015 * distributed under the License is distributed on an "AS IS" BASIS,
    016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    017 * See the License for the specific language governing permissions and
    018 * limitations under the License.
    019 */
    020
    021package cascading.operation.state;
    022
    023import java.beans.ConstructorProperties;
    024
    025import cascading.flow.FlowProcess;
    026import cascading.operation.BaseOperation;
    027import cascading.operation.Filter;
    028import cascading.operation.FilterCall;
    029import cascading.operation.OperationCall;
    030
    031/**
    032 * Class Status is a {@link cascading.operation.Filter} that sets the current {@link FlowProcess} 'status' on
    033 * the first {@link cascading.tuple.Tuple} it sees.
    034 * <p/>
    035 * Internally, the {@link #isRemove(cascading.flow.FlowProcess, cascading.operation.FilterCall)} method calls
    036 * {@link cascading.flow.FlowProcess#setStatus(String)}.
    037 * <p/>
    038 * No {@link cascading.tuple.Tuple} instances are ever discarded.
    039 *
    040 * @see FlowProcess
    041 * @see Filter
    042 */
    043public class Status extends BaseOperation<Boolean> implements Filter<Boolean>
    044  {
    045  /** Field status */
    046  private final String status;
    047
    048  /**
    049   * Constructor Status creates a new Status instance.
    050   *
    051   * @param status of type String
    052   */
    053  @ConstructorProperties({"status"})
    054  public Status( String status )
    055    {
    056    this.status = status;
    057    }
    058
    059  public String getStatus()
    060    {
    061    return status;
    062    }
    063
    064  @Override
    065  public void prepare( FlowProcess flowProcess, OperationCall<Boolean> operationCall )
    066    {
    067    operationCall.setContext( false );
    068    }
    069
    070  @Override
    071  public boolean isRemove( FlowProcess flowProcess, FilterCall<Boolean> filterCall )
    072    {
    073    if( !filterCall.getContext() )
    074      {
    075      filterCall.setContext( true );
    076      flowProcess.setStatus( status );
    077      }
    078
    079    return false;
    080    }
    081
    082  @Override
    083  public boolean equals( Object object )
    084    {
    085    if( this == object )
    086      return true;
    087    if( !( object instanceof Status ) )
    088      return false;
    089    if( !super.equals( object ) )
    090      return false;
    091
    092    Status status1 = (Status) object;
    093
    094    if( status != null ? !status.equals( status1.status ) : status1.status != null )
    095      return false;
    096
    097    return true;
    098    }
    099
    100  @Override
    101  public int hashCode()
    102    {
    103    int result = super.hashCode();
    104    result = 31 * result + ( status != null ? status.hashCode() : 0 );
    105    return result;
    106    }
    107  }