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/*
* Copyright (C) 2013, 2014, 2015 by the Konclude Developer Team.
*
* This file is part of the reasoning system Konclude.
* For details and support, see <http://konclude.com/>.
*
* Konclude is free software: you can redistribute it and/or modify it under
* the terms of version 2.1 of the GNU Lesser General Public License (LGPL2.1)
* as published by the Free Software Foundation.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Konclude. If not, see <http://www.gnu.org/licenses/>.
*
* Konclude is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For more
* details, see GNU Lesser General Public License.
*
*/
#include "CVariableBindingPathJoiningHasher.h"
namespace Konclude {
namespace Reasoner {
namespace Kernel {
namespace Process {
CVariableBindingPathJoiningHasher::CVariableBindingPathJoiningHasher(CVariableBindingPathJoiningData* data) {
mVarBindPath = nullptr;
mKeyVars = nullptr;
mJoiningData = data;
mHashValue = mJoiningData->getCalculatedHashValue();
}
CVariableBindingPathJoiningHasher::CVariableBindingPathJoiningHasher(CVariableBindingPath* varBindPath, CSortedLinker<CVariable*>* keyVars) {
mJoiningData = nullptr;
mVarBindPath = varBindPath;
mKeyVars = keyVars;
mHashValue = calculateHashValue(mVarBindPath,mKeyVars);
}
cint64 CVariableBindingPathJoiningHasher::calculateHashValue(CVariableBindingPath* varBindPath, CSortedLinker<CVariable*>* keyVars) {
cint64 hashValue = 0;
CSortedLinker<CVariable*>* keyVarsIt = keyVars;
cint64 multiplier = 13;
for (CVariableBindingDescriptor* linkerIt = varBindPath->getVariableBindingDescriptorLinker(); keyVarsIt && linkerIt; linkerIt = linkerIt->getNext()) {
CVariableBinding* variableBinding = linkerIt->getVariableBinding();
CVariable* variable = variableBinding->getBindedVariable();
CVariable* keyVariable = keyVarsIt->getData();
if (variable == keyVariable) {
hashValue += multiplier*(cint64)variableBinding;
multiplier = multiplier*2+1;
keyVarsIt = keyVarsIt->getNext();
}
}
return hashValue;
}
cint64 CVariableBindingPathJoiningHasher::getHashValue() const {
return mHashValue;
}
bool CVariableBindingPathJoiningHasher::operator==(const CVariableBindingPathJoiningHasher& hasher) const {
if (mJoiningData && hasher.mJoiningData) {
return mJoiningData->isKeyEquivalentTo(*hasher.mJoiningData);
} else if (mJoiningData && hasher.mVarBindPath) {
return mJoiningData->isKeyEquivalentTo(hasher.mVarBindPath);
} else if (mVarBindPath && hasher.mJoiningData) {
return hasher.mJoiningData->isKeyEquivalentTo(mVarBindPath);
}
return false;
}
}; // end namespace Process
}; // end namespace Kernel
}; // end namespace Reasoner
}; // end namespace Konclude
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