    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.assertion;
    022
    023import java.beans.ConstructorProperties;
    024import java.util.regex.Matcher;
    025import java.util.regex.Pattern;
    026
    027import cascading.flow.FlowProcess;
    028import cascading.management.annotation.Property;
    029import cascading.management.annotation.PropertyDescription;
    030import cascading.management.annotation.Visibility;
    031import cascading.operation.GroupAssertion;
    032import cascading.operation.GroupAssertionCall;
    033import cascading.operation.OperationCall;
    034import cascading.tuple.Tuple;
    035import cascading.tuple.TupleEntry;
    036import org.slf4j.Logger;
    037import org.slf4j.LoggerFactory;
    038
    039/**
    040 *
    041 */
    042public abstract class AssertGroupBase extends BaseAssertion<AssertGroupBase.Context> implements GroupAssertion<AssertGroupBase.Context>
    043  {
    044  /** Field LOG */
    045  private static final Logger LOG = LoggerFactory.getLogger( AssertGroupBase.class );
    046
    047  /** Field patternString */
    048  protected String patternString;
    049
    050  /** Field size */
    051  protected final long size;
    052
    053  public static class Context
    054    {
    055    Pattern pattern;
    056    Long count;
    057    String fields;
    058    String group;
    059
    060    public Context set( long count, String fields, String group )
    061      {
    062      this.count = count;
    063      this.fields = fields;
    064      this.group = group;
    065
    066      return this;
    067      }
    068
    069    public Context reset()
    070      {
    071      count = null;
    072      fields = null;
    073      group = null;
    074
    075      return this;
    076      }
    077    }
    078
    079  @ConstructorProperties({"message", "size"})
    080  public AssertGroupBase( String message, long size )
    081    {
    082    super( message );
    083    this.size = size;
    084    }
    085
    086  @ConstructorProperties({"message", "patternString", "size"})
    087  protected AssertGroupBase( String message, String patternString, long size )
    088    {
    089    super( message );
    090    this.patternString = patternString;
    091    this.size = size;
    092    }
    093
    094  @Property(name = "patternString", visibility = Visibility.PRIVATE)
    095  @PropertyDescription("The regular expression pattern string.")
    096  public String getPatternString()
    097    {
    098    return patternString;
    099    }
    100
    101  public long getSize()
    102    {
    103    return size;
    104    }
    105
    106  private Pattern getPattern()
    107    {
    108    Pattern pattern;
    109
    110    if( patternString == null )
    111      pattern = Pattern.compile( ".*" );
    112    else
    113      pattern = Pattern.compile( patternString );
    114
    115    return pattern;
    116    }
    117
    118  private boolean matchWholeTuple( Tuple input, Pattern pattern )
    119    {
    120    if( patternString == null )
    121      return true;
    122
    123    Matcher matcher = pattern.matcher( input.toString( "\t", false ) );
    124
    125    LOG.debug( "pattern: {}, matches: {}", pattern, matcher.matches() );
    126
    127    return matcher.matches();
    128    }
    129
    130  @Override
    131  public void prepare( FlowProcess flowProcess, OperationCall<Context> operationCall )
    132    {
    133    operationCall.setContext( new Context() );
    134    operationCall.getContext().pattern = getPattern();
    135    }
    136
    137  @Override
    138  public void start( FlowProcess flowProcess, GroupAssertionCall<Context> assertionCall )
    139    {
    140    TupleEntry groupEntry = assertionCall.getGroup();
    141    Context context = assertionCall.getContext();
    142
    143    // didn't match, so skip
    144    if( !matchWholeTuple( groupEntry.getTuple(), context.pattern ) )
    145      context.reset();
    146    else
    147      context.set( 0L, groupEntry.getFields().print(), groupEntry.getTuple().print() );
    148    }
    149
    150  @Override
    151  public void aggregate( FlowProcess flowProcess, GroupAssertionCall<Context> assertionCall )
    152    {
    153    Long groupSize = assertionCall.getContext().count;
    154
    155    // didn't match, so skip
    156    if( groupSize != null )
    157      assertionCall.getContext().count += 1L;
    158    }
    159
    160  @Override
    161  public void doAssert( FlowProcess flowProcess, GroupAssertionCall<Context> assertionCall )
    162    {
    163    Context context = assertionCall.getContext();
    164    Long groupSize = context.count;
    165
    166    if( groupSize == null ) // didn't match, so skip
    167      return;
    168
    169    if( assertFails( groupSize ) )
    170      {
    171      if( patternString == null )
    172        fail( groupSize, size, context.fields, context.group );
    173      else
    174        fail( patternString, groupSize, size, context.fields, context.group );
    175      }
    176    }
    177
    178  protected abstract boolean assertFails( Long groupSize );
    179
    180  @Override
    181  public boolean equals( Object object )
    182    {
    183    if( this == object )
    184      return true;
    185    if( !( object instanceof AssertGroupBase ) )
    186      return false;
    187    if( !super.equals( object ) )
    188      return false;
    189
    190    AssertGroupBase that = (AssertGroupBase) object;
    191
    192    if( size != that.size )
    193      return false;
    194    if( patternString != null ? !patternString.equals( that.patternString ) : that.patternString != null )
    195      return false;
    196
    197    return true;
    198    }
    199
    200  @Override
    201  public int hashCode()
    202    {
    203    int result = super.hashCode();
    204    result = 31 * result + ( patternString != null ? patternString.hashCode() : 0 );
    205    result = 31 * result + (int) ( size ^ size >>> 32 );
    206    return result;
    207    }
    208  }