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/******************************************************************************
*
* treekey.h - code for class 'TreeKey'
*
* $Id: treekey.h 2833 2013-06-29 06:40:28Z chrislit $
*
* Copyright 2002-2013 CrossWire Bible Society (http://www.crosswire.org)
* CrossWire Bible Society
* P. O. Box 2528
* Tempe, AZ 85280-2528
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2.
*
* This program 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. See the GNU
* General Public License for more details.
*
*/
#ifndef TREEKEY_H
#define TREEKEY_H
#include <swkey.h>
#include <swbuf.h>
#include <defs.h>
SWORD_NAMESPACE_START
/**
* Class TreeKey
* The base class for all tree-based key implementations in Sword.
*/
class SWDLLEXPORT TreeKey : public SWKey {
static SWClass classdef;
void init();
protected:
// hold on to setText until we've done a snap action: getText or navigation
// if we set, and then write out userData, we want to assure the path exists.
// This better conforms to the SWORD write methodology: mod.setKey, mod.setEntry
mutable SWBuf unsnappedKeyText;
// called whenever position of this key is changed. Should we move this
// to a more base class?
void positionChanged() { if (posChangeListener) posChangeListener->positionChanged(); }
public:
class PositionChangeListener {
TreeKey *treeKey;
public:
PositionChangeListener() {}
virtual ~PositionChangeListener() {}
virtual void positionChanged() = 0;
TreeKey *getTreeKey() { return treeKey; }
void setTreeKey(TreeKey *tk) { treeKey = tk; }
} *posChangeListener;
void setPositionChangeListener(PositionChangeListener *pcl) { posChangeListener = pcl; posChangeListener->setTreeKey(this); }
// TreeKey (const char *ikey = 0);
// TreeKey (const SWKey * ikey);
// TreeKey (TreeKey const &k);
TreeKey () { init(); };
~TreeKey () {};
virtual const char *getLocalName() = 0;
virtual const char *setLocalName(const char *) = 0;
virtual int getLevel() { long bm = getOffset(); int level = 0; do { level++; } while (parent()); setOffset(bm); return level; }
virtual const char *getUserData(int *size = 0) const = 0;
virtual void setUserData(const char *userData, int size = 0) = 0;
/** Go to the root node
*/
virtual void root() = 0;
/** Go to the parent of the current node
* @return success or failure
*/
virtual bool parent() = 0;
/** Go to the first child of the current node
* @return success or failure
*/
virtual bool firstChild() = 0;
/** Go to the next sibling of the current node
* @return success or failure
*/
virtual bool nextSibling() = 0;
/** Go to the previous sibling of the current node
* @return success or failure
*/
virtual bool previousSibling() = 0;
/** Does the current node have children?
* @return whether or not it does
*/
virtual bool hasChildren() = 0;
virtual void append() = 0;
virtual void appendChild() = 0;
virtual void insertBefore() = 0;
virtual void remove() = 0;
virtual void setOffset(unsigned long offset) = 0;
virtual unsigned long getOffset() const = 0;
virtual void setText(const char *ikey) = 0;
virtual void setPosition(SW_POSITION p) = 0;
virtual const char *getText() const = 0;
virtual int compare(const SWKey &ikey) = 0;
virtual void decrement(int steps = 1) = 0;
virtual void increment(int steps = 1) = 0;
virtual bool isTraversable() const { return true; }
virtual long getIndex() const { return getOffset(); }
virtual void setIndex(long iindex) { setOffset(iindex); }
/** Set the key to this path. If the path doesn't exist, then
* nodes are created as necessary
* @param keyPath path to set/create; if unsupplied, then use any unsnapped setText value.
*/
virtual void assureKeyPath(const char *keyPath = 0);
virtual void save() {}
SWKEY_OPERATORS
};
SWORD_NAMESPACE_END
#endif
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