001    /*
002     * Copyright (c) 2007-2015 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    
021    package cascading.operation.filter;
022    
023    import java.beans.ConstructorProperties;
024    
025    import cascading.flow.FlowProcess;
026    import cascading.operation.Filter;
027    import cascading.operation.FilterCall;
028    import cascading.tuple.Fields;
029    import cascading.tuple.Tuple;
030    import cascading.tuple.TupleEntry;
031    
032    /**
033     * Class And is a {@link Filter} class that will logically 'and' the results of the constructor provided Filter
034     * instances.
035     * <p/>
036     * Logically, if {@link Filter#isRemove(cascading.flow.FlowProcess, cascading.operation.FilterCall)} returns {@code true} for all given instances,
037     * this filter will return {@code true}.
038     *
039     * @see Or
040     * @see Xor
041     * @see Not
042     */
043    public class And extends Logic
044      {
045      /**
046       * Constructor And creates a new And instance where all Filter instances receive all arguments.
047       *
048       * @param filters of type Filter...
049       */
050      @ConstructorProperties({"filters"})
051      public And( Filter... filters )
052        {
053        super( filters );
054        }
055    
056      /**
057       * Constructor And creates a new And instance.
058       *
059       * @param lhsArgumentSelector of type Fields
060       * @param lhsFilter           of type Filter
061       * @param rhsArgumentSelector of type Fields
062       * @param rhsFilter           of type Filter
063       */
064      @ConstructorProperties({"lhsArgumentsSelector", "lhsFilter", "rhsArgumentSelector", "rhsFilter"})
065      public And( Fields lhsArgumentSelector, Filter lhsFilter, Fields rhsArgumentSelector, Filter rhsFilter )
066        {
067        super( lhsArgumentSelector, lhsFilter, rhsArgumentSelector, rhsFilter );
068        }
069    
070      /**
071       * Constructor And creates a new And instance.
072       *
073       * @param argumentSelectors of type Fields[]
074       * @param filters           of type Filter[]
075       */
076      @ConstructorProperties({"argumentFilters", "filters"})
077      public And( Fields[] argumentSelectors, Filter[] filters )
078        {
079        super( argumentSelectors, filters );
080        }
081    
082      @Override
083      public boolean isRemove( FlowProcess flowProcess, FilterCall filterCall )
084        {
085        TupleEntry arguments = filterCall.getArguments();
086        Context context = (Context) filterCall.getContext();
087    
088        TupleEntry[] argumentEntries = context.argumentEntries;
089    
090        for( int i = 0; i < argumentSelectors.length; i++ )
091          {
092          Tuple selected = arguments.selectTuple( argumentSelectors[ i ] );
093    
094          argumentEntries[ i ].setTuple( selected );
095    
096          if( !filters[ i ].isRemove( flowProcess, context.calls[ i ] ) )
097            return false;
098          }
099    
100        return true;
101        }
102      }