/*
* 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:
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* * 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.
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* * 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
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/*
* NRecordFromJListPrimitive.java
* Created: Jul 28, 2005
* By: Raymond Cypher
*/
package org.openquark.cal.internal.machine.g.functions;
import java.util.Iterator;
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.NValObject;
import org.openquark.cal.internal.machine.g.Node;
import org.openquark.cal.internal.module.Cal.Core.CAL_Prelude_internal;
import org.openquark.cal.module.Cal.Core.CAL_Prelude;
import org.openquark.cal.runtime.CALExecutorException;
/**
* Implementation of Prelude.recordFromJListPrimitive :: Inputable r => JList -> {r};
*/
public final class NRecordFromJListPrimitive extends NPrimitiveFunc {
public static final QualifiedName name = CAL_Prelude_internal.Functions.recordFromJListPrimitive;
public static final NRecordFromJListPrimitive instance = new NRecordFromJListPrimitive ();
private boolean implementationChecked = false;
private NRecordFromJListPrimitive () { /* Constructor made private for creation control. */}
@Override
protected int getArity () {
return 2;
}
@Override
protected QualifiedName getName () {
return name;
}
/**
* Convert a java representation of a record into an internal record.
*/
@Override
public Node doEvaluation (Node[] arguments, Executor executor)
throws CALExecutorException {
checkImplementation(executor);
// The two arguments in evaluated form will be on top of the stack, in reverse order.
NRecordValue recordDictionary = (NRecordValue) executor.internalEvaluate(arguments[0]);
List<?> inputList = (List<?>)((NValObject)executor.internalEvaluate(arguments[1])).getValue();
//we use an iterator since inputList may be a non-random access list such as a java.util.LinkedList.
Iterator<?> inputListIterator = inputList.iterator();
List<String> fieldNames = recordDictionary.fieldNames();
int nFields = fieldNames.size();
//check that the number of fields in the inputList is the same as the number of fields in the record.
//without this check it is possible that inputList could have more elements than the size of the record and still succeed.
//This would still "work" but this check is useful to alert clients to potential bugs in their code.
if (nFields != inputList.size()) {
throw new IllegalArgumentException("A Java list of size " + inputList.size() + " cannot be input to a record with " + nFields + " fields.");
}
// Create a record value.
NRecordValue newRecord = new NRecordValue (nFields);
// The order of iteration over the fields is unimportant in this case, since there is no
// evaluation being done. We're just pushing suspensions into the NRecordValue node.
for (int i = 0; i < nFields; ++i) {
String fieldName = fieldNames.get(i);
newRecord.putValue (fieldName, recordDictionary.getValue(fieldName).apply (new NValObject(inputListIterator.next())));
}
return newRecord;
}
private void checkImplementation (Executor executor) {
if(!implementationChecked) {
if (!isSingleMethodRootClass(executor, CAL_Prelude.TypeClasses.Inputable)) {
throw new IllegalStateException("The implementation of " + CAL_Prelude_internal.Functions.recordFromJListPrimitive.getQualifiedName() + " assumes that the class " + CAL_Prelude.TypeClasses.Inputable.getQualifiedName() + " has no superclasses and only 1 class method.");
}
implementationChecked = true;
}
}
}