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/*
* Copyright (c) 2007, CustomWare Asia Pacific
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of "CustomWare Asia Pacific" nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package org.randombits.confluence.metadata.expression;
import org.randombits.math.eval.Cases;
import org.randombits.math.eval.ExpressionCommand;
import org.randombits.math.eval.ExpressionProgram;
import org.randombits.math.eval.StackOfDouble;
import org.randombits.math.eval.Variable;
import org.randombits.storage.Storage;
/**
* A command which will sum the specified fields in the table when applied.
*
* @author David Peterson
*/
public class SumTableCommand implements ExpressionCommand {
/**
*
*/
private static final long serialVersionUID = -2438215390705484823L;
private Storage fields;
private String tableName, fieldName;
private String rowCountField;
SumTableCommand( String tableName, String fieldName, String rowCountField, Storage fields, ExpressionProgram e ) {
// Constructor.
this.tableName = tableName;
this.fieldName = fieldName;
this.rowCountField = rowCountField;
this.fields = fields;
}
public void apply( StackOfDouble stack, Cases cases ) {
double sum = 0;
// Push into the table
fields.openBox( tableName );
int rowCount = fields.getInteger( rowCountField, 0 );
for ( int i = 0; i < rowCount; i++ ) {
fields.openBox( String.valueOf( i ) );
Number value = fields.getNumber( fieldName, null );
sum += ( value != null ) ? value.doubleValue() : 0.0d;
fields.closeBox();
}
// Get back out of the table space.
fields.closeBox();
stack.push( sum );
}
public void compileDerivative( ExpressionProgram prog, int myIndex, ExpressionProgram deriv, Variable wrt ) {
deriv.addConstant( 0 );
}
public int extent( ExpressionProgram prog, int myIndex ) {
return 1; // Upper + lower limits + this object.
}
public boolean dependsOn( Variable x ) {
return false;
}
public void appendOutputString( ExpressionProgram prog, int myIndex, StringBuffer buffer ) {
buffer.append( "sumtable(\"" );
buffer.append( tableName );
buffer.append( "\", \"" );
buffer.append( fieldName );
buffer.append( "\")" );
}
}
