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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef txResultRecycler_h__
#define txResultRecycler_h__
#include "nsCOMPtr.h"
#include "txStack.h"
class txAExprResult;
class StringResult;
class txNodeSet;
class txXPathNode;
class NumberResult;
class BooleanResult;
class txResultRecycler {
public:
txResultRecycler();
~txResultRecycler();
void AddRef() {
++mRefCnt;
NS_LOG_ADDREF(this, mRefCnt, "txResultRecycler", sizeof(*this));
}
void Release() {
--mRefCnt;
NS_LOG_RELEASE(this, mRefCnt, "txResultRecycler");
if (mRefCnt == 0) {
mRefCnt = 1; // stabilize
delete this;
}
}
/**
* Returns an txAExprResult to this recycler for reuse.
* @param aResult result to recycle
*/
void recycle(txAExprResult* aResult);
/**
* Functions to return results that will be fully used by the caller.
* Returns nullptr on out-of-memory and an inited result otherwise.
*/
nsresult getStringResult(StringResult** aResult);
nsresult getStringResult(const nsAString& aValue, txAExprResult** aResult);
nsresult getNodeSet(txNodeSet** aResult);
nsresult getNodeSet(txNodeSet* aNodeSet, txNodeSet** aResult);
nsresult getNodeSet(const txXPathNode& aNode, txAExprResult** aResult);
nsresult getNumberResult(double aValue, txAExprResult** aResult);
/**
* Functions to return a txAExprResult that is shared across several
* clients and must not be modified. Never returns nullptr.
*/
void getEmptyStringResult(txAExprResult** aResult);
void getBoolResult(bool aValue, txAExprResult** aResult);
/**
* Functions that return non-shared resultsobjects
*/
nsresult getNonSharedNodeSet(txNodeSet* aNodeSet, txNodeSet** aResult);
private:
nsAutoRefCnt mRefCnt;
txStack mStringResults;
txStack mNodeSetResults;
txStack mNumberResults;
RefPtr<StringResult> mEmptyStringResult;
RefPtr<BooleanResult> mTrueResult;
RefPtr<BooleanResult> mFalseResult;
};
#endif // txResultRecycler_h__
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