/*
* Copyright (c) 2007-2014 Concurrent, Inc. All Rights Reserved.
*
* Project and contact information: http://www.cascading.org/
*
* This file is part of the Cascading project.
*
* Licensed 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 cascading.operation.expression;
import cascading.CascadingTestCase;
import cascading.tuple.Fields;
import cascading.tuple.Tuple;
import cascading.tuple.TupleEntry;
import cascading.tuple.TupleListCollector;
import org.junit.Test;
/**
*
*/
public class ExpressionTest extends CascadingTestCase
{
public ExpressionTest()
{
}
@Test
public void testExpressionFunction()
{
assertEquals( 3, evaluate( new ExpressionFunction( new Fields( "result" ), "a + b", int.class ), getEntry( 1, 2 ) ) );
assertEquals( 3, evaluate( new ExpressionFunction( new Fields( "result" ), "a + b", int.class ), getEntry( 1.0, 2.0 ) ) );
assertEquals( 3, evaluate( new ExpressionFunction( new Fields( "result" ), "a + b", int.class ), getEntry( "1", 2.0 ) ) );
String[] names = new String[]{"a", "b"};
Class[] types = new Class[]{long.class, int.class};
assertEquals( 3l, evaluate( new ExpressionFunction( new Fields( "result" ), "a + b", names, types ), getEntry( 1, 2 ) ) );
assertEquals( 3l, evaluate( new ExpressionFunction( new Fields( "result" ), "a + b", names, types ), getEntry( 1.0, 2.0 ) ) );
assertEquals( 3l, evaluate( new ExpressionFunction( new Fields( "result" ), "a + b", names, types ), getEntry( "1", 2.0 ) ) );
types = new Class[]{double.class, int.class};
assertEquals( 3d, evaluate( new ExpressionFunction( new Fields( "result" ), "a + b", names, types ), getEntry( 1, 2 ) ) );
assertEquals( 3d, evaluate( new ExpressionFunction( new Fields( "result" ), "a + b", names, types ), getEntry( 1.0, 2.0 ) ) );
assertEquals( 3d, evaluate( new ExpressionFunction( new Fields( "result" ), "a + b", names, types ), getEntry( "1", 2.0 ) ) );
Fields arguments = new Fields( names ).applyTypes( types );
assertEquals( 3d, evaluate( new ExpressionFunction( new Fields( "result" ), "a + b" ), getEntry( arguments, 1, 2 ) ) );
assertEquals( 3d, evaluate( new ExpressionFunction( new Fields( "result" ), "a + b" ), getEntry( arguments, 1.0, 2.0 ) ) );
assertEquals( 3d, evaluate( new ExpressionFunction( new Fields( "result" ), "a + b" ), getEntry( arguments, "1", 2.0 ) ) );
assertEquals( 3, evaluate( new ExpressionFunction( new Fields( "result" ), "$0 + $1", int.class ), getEntry( 1, 2 ) ) );
assertEquals( 3, evaluate( new ExpressionFunction( new Fields( "result" ), "$0 + $1", int.class ), getEntry( 1.0, 2.0 ) ) );
assertEquals( 3, evaluate( new ExpressionFunction( new Fields( "result" ), "$0 + $1", int.class ), getEntry( "1", 2.0 ) ) );
names = new String[]{"a", "b"};
types = new Class[]{String.class, int.class};
assertEquals( true, evaluate( new ExpressionFunction( new Fields( "result" ), "(a != null) && (b > 0)", names, types ), getEntry( "1", 2.0 ) ) );
names = new String[]{"$0", "$1"};
types = new Class[]{String.class, int.class};
assertEquals( true, evaluate( new ExpressionFunction( new Fields( "result" ), "($0 != null) && ($1 > 0)", names, types ), getEntry( "1", 2.0 ) ) );
names = new String[]{"a", "b", "c"};
types = new Class[]{float.class, String.class, String.class};
assertEquals( true, evaluate( new ExpressionFunction( new Fields( "result" ), "b.equals(\"1\") && (a == 2.0) && c.equals(\"2\")", names, types ), getEntry( 2.0, "1", "2" ) ) );
names = new String[]{"a", "b", "$2"};
types = new Class[]{float.class, String.class, String.class};
assertEquals( true, evaluate( new ExpressionFunction( new Fields( "result" ), "b.equals(\"1\") && (a == 2.0) && $2.equals(\"2\")", names, types ), getEntry( 2.0, "1", "2" ) ) );
}
@Test
public void testExpressionFilter()
{
assertEquals( true, invokeFilter( new ExpressionFilter( "a < b", int.class ), getEntry( 1, 2 ) ) );
assertEquals( true, invokeFilter( new ExpressionFilter( "a < b", int.class ), getEntry( 1.0, 2.0 ) ) );
assertEquals( true, invokeFilter( new ExpressionFilter( "a < b", int.class ), getEntry( "1", 2.0 ) ) );
String[] names = new String[]{"a", "b"};
Class[] types = new Class[]{long.class, int.class};
assertEquals( true, invokeFilter( new ExpressionFilter( "a < b", names, types ), getEntry( 1, 2 ) ) );
assertEquals( true, invokeFilter( new ExpressionFilter( "a < b", names, types ), getEntry( 1.0, 2.0 ) ) );
assertEquals( true, invokeFilter( new ExpressionFilter( "a < b", names, types ), getEntry( "1", 2.0 ) ) );
types = new Class[]{double.class, int.class};
assertEquals( true, invokeFilter( new ExpressionFilter( "a < b", names, types ), getEntry( 1, 2 ) ) );
assertEquals( true, invokeFilter( new ExpressionFilter( "a < b", names, types ), getEntry( 1.0, 2.0 ) ) );
assertEquals( true, invokeFilter( new ExpressionFilter( "a < b", names, types ), getEntry( "1", 2.0 ) ) );
Fields arguments = new Fields( names ).applyTypes( types );
assertEquals( true, invokeFilter( new ExpressionFilter( "a < b" ), getEntry( arguments, 1, 2 ) ) );
assertEquals( true, invokeFilter( new ExpressionFilter( "a < b" ), getEntry( arguments, 1.0, 2.0 ) ) );
assertEquals( true, invokeFilter( new ExpressionFilter( "a < b" ), getEntry( arguments, "1", 2.0 ) ) );
assertEquals( true, invokeFilter( new ExpressionFilter( "$0 < $1", int.class ), getEntry( 1, 2 ) ) );
assertEquals( true, invokeFilter( new ExpressionFilter( "$0 < $1", int.class ), getEntry( 1.0, 2.0 ) ) );
assertEquals( true, invokeFilter( new ExpressionFilter( "$0 < $1", int.class ), getEntry( "1", 2.0 ) ) );
names = new String[]{"a", "b"};
types = new Class[]{String.class, int.class};
assertEquals( true, invokeFilter( new ExpressionFilter( "(a != null) && (b > 0)", names, types ), getEntry( "1", 2.0 ) ) );
names = new String[]{"$0", "$1"};
types = new Class[]{String.class, int.class};
assertEquals( true, invokeFilter( new ExpressionFilter( "($0 != null) && ($1 > 0)", names, types ), getEntry( "1", 2.0 ) ) );
names = new String[]{"a", "b", "c"};
types = new Class[]{float.class, String.class, String.class};
assertEquals( true, invokeFilter( new ExpressionFilter( "b.equals(\"1\") && (a == 2.0) && c.equals(\"2\")", names, types ), getEntry( 2.0, "1", "2" ) ) );
names = new String[]{"a", "b", "$2"};
types = new Class[]{float.class, String.class, String.class};
assertEquals( true, invokeFilter( new ExpressionFilter( "b.equals(\"1\") && (a == 2.0) && $2.equals(\"2\")", names, types ), getEntry( 2.0, "1", "2" ) ) );
}
@Test
public void testNoParamExpression()
{
Fields fields = new Fields( "a", "b" ).applyTypes( String.class, double.class );
String expression = "(int) (Math.random() * Integer.MAX_VALUE)";
Number integer = (Number) evaluate( new ExpressionFunction( new Fields( "result" ), expression ), getEntry( fields, "1", 2.0 ) );
assertNotNull( integer );
// Fields.NONE as argument selector
integer = (Number) evaluate( new ExpressionFunction( new Fields( "result" ), expression ), TupleEntry.NULL );
assertNotNull( integer );
try
{
evaluate( new ExpressionFunction( new Fields( "result" ), "(int) (Math.random() * Integer.MAX_VALUE) + parameter" ), getEntry( fields, "1", 2.0 ) );
fail( "should throw exception" );
}
catch( Exception exception )
{
// ignore
}
}
private Object evaluate( ExpressionFunction function, TupleEntry tupleEntry )
{
TupleListCollector tuples = invokeFunction( function, tupleEntry, function.getFieldDeclaration() );
return tuples.entryIterator().next().getObject( 0 );
}
private TupleEntry getEntry( Fields fields, Comparable lhs, Comparable rhs )
{
Tuple parameters = new Tuple( lhs, rhs );
return new TupleEntry( fields, parameters );
}
private TupleEntry getEntry( Comparable lhs, Comparable rhs )
{
Fields fields = new Fields( "a", "b" );
Tuple parameters = new Tuple( lhs, rhs );
return new TupleEntry( fields, parameters );
}
private TupleEntry getEntry( Comparable f, Comparable s, Comparable t )
{
Fields fields = new Fields( "a", "b", "c" );
Tuple parameters = new Tuple( f, s, t );
return new TupleEntry( fields, parameters );
}
}