/*
* Copyright (c) 2007 BUSINESS OBJECTS SOFTWARE LIMITED
* 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 Business Objects 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
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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/*
* NRTArbitraryRecordPrimitive.java
* Creation date: Oct 3, 2006.
* By: Magnus Byne
*/
package org.openquark.cal.internal.machine.g.functions;
import java.util.List;
import org.openquark.cal.compiler.QualifiedName;
import org.openquark.cal.internal.machine.g.Executor;
import org.openquark.cal.internal.machine.g.NPrimitiveFunc;
import org.openquark.cal.internal.machine.g.NRecordValue;
import org.openquark.cal.internal.machine.g.NValInt;
import org.openquark.cal.internal.machine.g.Node;
import org.openquark.cal.internal.module.Cal.Utilities.CAL_QuickCheck_internal;
import org.openquark.cal.runtime.CALExecutorException;
/**
* Implements the built-in primitive function:
* arbitraryRecordPrimitive :: Arbitrary r => GenParams -> (GenParams -> GenParams) -> {r}
* for the G machine.
*
* @author Magnus Byne
*/
public class NArbitraryRecordPrimitive extends NPrimitiveFunc {
public static final QualifiedName name = CAL_QuickCheck_internal.Functions.arbitraryRecordPrimitive;
public static final NArbitraryRecordPrimitive instance = new NArbitraryRecordPrimitive ();
private NValInt indexOfGenerateClassMethod = null;
private NArbitraryRecordPrimitive () {/* Constructor made private to control creation. */ }
@Override
protected int getArity () {
return 3;
}
@Override
protected QualifiedName getName () {
return name;
}
@Override
public Node doEvaluation (Node[] arguments, Executor executor)
throws CALExecutorException {
// Evaluate the 3 arguments.
NRecordValue recordDictionary = (NRecordValue) executor.internalEvaluate(arguments[0]);
Node genParams = executor.internalEvaluate(arguments[1]);
Node independent = executor.internalEvaluate(arguments[2]);
NValInt arbitraryMethodIndex = getIndexOfGenerateClassMethod(executor);
List<String> fieldNames = recordDictionary.fieldNames();
final int nFields = fieldNames.size();
NRecordValue result=new NRecordValue(nFields);
/*
* Loops through all fields in the record dictionary and
* invokes the arbitrary class method to
* construct each record field
*/
for (int i = 0; i < nFields; ++i) {
genParams=executor.internalEvaluate(independent.apply( new NValInt(i)).apply(genParams));
String fieldName = fieldNames.get(i);
Node valueDictionaryThunk = recordDictionary.getValue(fieldName);
result= result.insertRecordField(fieldName,
executor.internalEvaluate(valueDictionaryThunk.apply(arbitraryMethodIndex).apply(genParams)));
}
return result;
}
/**
* Retrieve the current index of the arbitrary class method.
* @param executor
* @return - NValInt holding the index.
*/
private final NValInt getIndexOfGenerateClassMethod (Executor executor) {
if (indexOfGenerateClassMethod == null) {
final int index = classMethodDictionaryIndex(executor, CAL_QuickCheck_internal.Functions.generateInstance);
indexOfGenerateClassMethod = new NValInt(index);
}
return indexOfGenerateClassMethod;
}
}