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<h1>/builddir/build/BUILD/soprano-2.5.2/soprano/iterator.h</h1> </div>
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<a href="iterator_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * This file is part of Soprano Project.</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * Copyright (C) 2006 Daniele Galdi <daniele.galdi@gmail.com></span>
<a name="l00005"></a>00005 <span class="comment"> * Copyright (C) 2007 Sebastian Trueg <trueg@kde.org></span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
<a name="l00008"></a>00008 <span class="comment"> * modify it under the terms of the GNU Library General Public</span>
<a name="l00009"></a>00009 <span class="comment"> * License as published by the Free Software Foundation; either</span>
<a name="l00010"></a>00010 <span class="comment"> * version 2 of the License, or (at your option) any later version.</span>
<a name="l00011"></a>00011 <span class="comment"> *</span>
<a name="l00012"></a>00012 <span class="comment"> * This library is distributed in the hope that it will be useful,</span>
<a name="l00013"></a>00013 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00014"></a>00014 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00015"></a>00015 <span class="comment"> * Library General Public License for more details.</span>
<a name="l00016"></a>00016 <span class="comment"> *</span>
<a name="l00017"></a>00017 <span class="comment"> * You should have received a copy of the GNU Library General Public License</span>
<a name="l00018"></a>00018 <span class="comment"> * along with this library; see the file COPYING.LIB. If not, write to</span>
<a name="l00019"></a>00019 <span class="comment"> * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,</span>
<a name="l00020"></a>00020 <span class="comment"> * Boston, MA 02110-1301, USA.</span>
<a name="l00021"></a>00021 <span class="comment"> */</span>
<a name="l00022"></a>00022
<a name="l00023"></a>00023 <span class="preprocessor">#ifndef SOPRANO_ITERATOR_H</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span><span class="preprocessor">#define SOPRANO_ITERATOR_H</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include <QtCore/QSharedDataPointer></span>
<a name="l00027"></a>00027 <span class="preprocessor">#include <QtCore/QList></span>
<a name="l00028"></a>00028
<a name="l00029"></a>00029 <span class="preprocessor">#include "<a class="code" href="iteratorbackend_8h.html">iteratorbackend.h</a>"</span>
<a name="l00030"></a>00030 <span class="preprocessor">#include "<a class="code" href="error_8h.html">error.h</a>"</span>
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="keyword">namespace </span>Soprano {
<a name="l00033"></a>00033
<a name="l00078"></a>00078 <span class="keyword">template</span><<span class="keyword">typename</span> T> <span class="keyword">class </span>Iterator : <span class="keyword">public</span> Error::ErrorCache
<a name="l00079"></a>00079 {
<a name="l00080"></a>00080 <span class="keyword">public</span>:
<a name="l00084"></a>00084 <a class="code" href="classSoprano_1_1Iterator.html#af0cc2606052285dcd4ab3bd2f93377a2">Iterator</a>();
<a name="l00085"></a>00085
<a name="l00090"></a>00090 <a class="code" href="classSoprano_1_1Iterator.html#af0cc2606052285dcd4ab3bd2f93377a2">Iterator</a>( IteratorBackend<T> *sti );
<a name="l00091"></a>00091
<a name="l00092"></a>00092 <a class="code" href="classSoprano_1_1Iterator.html#af0cc2606052285dcd4ab3bd2f93377a2">Iterator</a>( <span class="keyword">const</span> <a class="code" href="classSoprano_1_1Iterator.html#af0cc2606052285dcd4ab3bd2f93377a2">Iterator</a> &sti );
<a name="l00093"></a>00093
<a name="l00094"></a>00094 <span class="keyword">virtual</span> <a class="code" href="classSoprano_1_1Iterator.html#a1b46cffbe390bd0e23cdda417c6ad845">~Iterator</a>();
<a name="l00095"></a>00095
<a name="l00096"></a>00096 <a class="code" href="classSoprano_1_1Iterator.html#af0cc2606052285dcd4ab3bd2f93377a2">Iterator</a>& <a class="code" href="classSoprano_1_1Iterator.html#a1c83515d4e73f9603d3b84a647fee5de">operator=</a>( <span class="keyword">const</span> <a class="code" href="classSoprano_1_1Iterator.html#af0cc2606052285dcd4ab3bd2f93377a2">Iterator</a>& );
<a name="l00097"></a>00097
<a name="l00101"></a>00101 <span class="keywordtype">void</span> <a class="code" href="classSoprano_1_1Iterator.html#a623fb6440a6cfadbb560bd7738c01871">close</a>();
<a name="l00102"></a>00102
<a name="l00108"></a>00108 <span class="keywordtype">bool</span> <a class="code" href="classSoprano_1_1Iterator.html#a1ba632f6f015242ab9441da77d48415b">next</a>();
<a name="l00109"></a>00109
<a name="l00116"></a>00116 T <a class="code" href="classSoprano_1_1Iterator.html#a7060834a96aced1bba25e760474ac22e">current</a>() <span class="keyword">const</span>;
<a name="l00117"></a>00117
<a name="l00126"></a>00126 T <a class="code" href="classSoprano_1_1Iterator.html#a5b6240c9f5f7686ce76e4eb2a39f6f9f">operator*</a>() <span class="keyword">const</span>;
<a name="l00127"></a>00127
<a name="l00132"></a>00132 <span class="keywordtype">bool</span> <a class="code" href="classSoprano_1_1Iterator.html#a03d741ebdc499352fa85b38835825f6a">isValid</a>() <span class="keyword">const</span>;
<a name="l00133"></a>00133
<a name="l00143"></a>00143 <a class="codeRef" href="qlist.html">QList<T></a> <a class="code" href="classSoprano_1_1Iterator.html#ab8f53c8b02072c3e688ee62e5f318b46">allElements</a>();
<a name="l00144"></a>00144
<a name="l00145"></a>00145 <span class="keyword">protected</span>:
<a name="l00151"></a>00151 <span class="keywordtype">void</span> <a class="code" href="classSoprano_1_1Iterator.html#a27a5362ea770284c1a83d5b432f8a59b">setBackend</a>( IteratorBackend<T>* b );
<a name="l00152"></a>00152
<a name="l00153"></a>00153 IteratorBackend<T>* <a class="code" href="classSoprano_1_1Iterator.html#aff7df72a54da0b2dee48f1a1b59e0ac8">backend</a>() <span class="keyword">const</span>;
<a name="l00154"></a>00154
<a name="l00155"></a>00155 <span class="keyword">private</span>:
<a name="l00156"></a>00156 <span class="keyword">class </span>Private;
<a name="l00157"></a>00157 <a class="codeRef" href="qshareddatapointer.html">QSharedDataPointer<Private></a> d;
<a name="l00158"></a>00158 };
<a name="l00159"></a>00159 }
<a name="l00160"></a>00160
<a name="l00161"></a>00161
<a name="l00163"></a>00163 <span class="keyword">template</span><<span class="keyword">typename</span> T> <span class="keyword">class </span><a class="code" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Soprano::Iterator</a><T>::Private : <span class="keyword">public</span> <a class="codeRef" href="qshareddata.html">QSharedData</a>
<a name="l00164"></a>00164 {
<a name="l00165"></a>00165 <span class="keyword">public</span>:
<a name="l00166"></a>00166 Private()
<a name="l00167"></a>00167 : <a class="code" href="classSoprano_1_1Iterator.html#aff7df72a54da0b2dee48f1a1b59e0ac8">backend</a>( 0 ) {
<a name="l00168"></a>00168 }
<a name="l00169"></a>00169
<a name="l00170"></a>00170 ~Private() {
<a name="l00171"></a>00171 <span class="keywordflow">if</span>( <a class="code" href="classSoprano_1_1Iterator.html#aff7df72a54da0b2dee48f1a1b59e0ac8">backend</a> ) {
<a name="l00172"></a>00172 <a class="code" href="classSoprano_1_1Iterator.html#aff7df72a54da0b2dee48f1a1b59e0ac8">backend</a>->close();
<a name="l00173"></a>00173 <span class="keyword">delete</span> backend;
<a name="l00174"></a>00174 }
<a name="l00175"></a>00175 }
<a name="l00176"></a>00176
<a name="l00177"></a>00177 IteratorBackend<T>* backend;
<a name="l00178"></a>00178 };
<a name="l00179"></a>00179
<a name="l00180"></a>00180
<a name="l00181"></a>00181 <span class="keyword">template</span><<span class="keyword">typename</span> T> <a class="code" href="classSoprano_1_1Iterator.html#af0cc2606052285dcd4ab3bd2f93377a2">Soprano::Iterator<T>::Iterator</a>()
<a name="l00182"></a>00182 : Error::ErrorCache(),
<a name="l00183"></a>00183 d( new Private() )
<a name="l00184"></a>00184
<a name="l00185"></a>00185 {
<a name="l00186"></a>00186 }
<a name="l00187"></a>00187
<a name="l00188"></a>00188 <span class="keyword">template</span><<span class="keyword">typename</span> T> <a class="code" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Soprano::Iterator<T>::Iterator</a>( IteratorBackend<T> *sti )
<a name="l00189"></a>00189 : Error::ErrorCache(),
<a name="l00190"></a>00190 d( new Private() )
<a name="l00191"></a>00191 {
<a name="l00192"></a>00192 d->backend = sti;
<a name="l00193"></a>00193 }
<a name="l00194"></a>00194
<a name="l00195"></a>00195 <span class="keyword">template</span><<span class="keyword">typename</span> T> <a class="code" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Soprano::Iterator<T>::Iterator</a>( <span class="keyword">const</span> Iterator<T> &other )
<a name="l00196"></a>00196 : Error::ErrorCache(),
<a name="l00197"></a>00197 d( other.d )
<a name="l00198"></a>00198 {
<a name="l00199"></a>00199 }
<a name="l00200"></a>00200
<a name="l00201"></a>00201 <span class="keyword">template</span><<span class="keyword">typename</span> T> <a class="code" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Soprano::Iterator<T>::~Iterator</a>()
<a name="l00202"></a>00202 {
<a name="l00203"></a>00203 }
<a name="l00204"></a>00204
<a name="l00205"></a>00205 <span class="keyword">template</span><<span class="keyword">typename</span> T> <a class="code" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Soprano::Iterator<T></a>& <a class="code" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Soprano::Iterator<T>::operator=</a>( <span class="keyword">const</span> Iterator<T>& other )
<a name="l00206"></a>00206 {
<a name="l00207"></a>00207 d = other.d;
<a name="l00208"></a>00208 <span class="keywordflow">return</span> *<span class="keyword">this</span>;
<a name="l00209"></a>00209 }
<a name="l00210"></a>00210
<a name="l00211"></a>00211 <span class="keyword">template</span><<span class="keyword">typename</span> T> <span class="keywordtype">void</span> <a class="code" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Soprano::Iterator<T>::setBackend</a>( IteratorBackend<T>* b )
<a name="l00212"></a>00212 {
<a name="l00213"></a>00213 <span class="keywordflow">if</span> ( d->backend != b ) {
<a name="l00214"></a>00214 <span class="comment">// now we want it to detach</span>
<a name="l00215"></a>00215 d->backend = b;
<a name="l00216"></a>00216 }
<a name="l00217"></a>00217 }
<a name="l00218"></a>00218
<a name="l00219"></a>00219 <span class="keyword">template</span><<span class="keyword">typename</span> T> <a class="code" href="classSoprano_1_1IteratorBackend.html" title="The actual work in a Iterator instance is done by an IteratorBackend.">Soprano::IteratorBackend<T></a>* <a class="code" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Soprano::Iterator<T>::backend</a>()<span class="keyword"> const</span>
<a name="l00220"></a>00220 <span class="keyword"></span>{
<a name="l00221"></a>00221 <span class="keywordflow">return</span> d->backend;
<a name="l00222"></a>00222 }
<a name="l00223"></a>00223
<a name="l00224"></a>00224 <span class="keyword">template</span><<span class="keyword">typename</span> T> <span class="keywordtype">void</span> <a class="code" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Soprano::Iterator<T>::close</a>()
<a name="l00225"></a>00225 {
<a name="l00226"></a>00226 <span class="comment">// some evil hacking to avoid detachment of the shared data</span>
<a name="l00227"></a>00227 <span class="keywordflow">if</span>( <a class="code" href="classSoprano_1_1Inference_1_1StatementPattern.html#aa501329dbaf6fe6a0a200307f90ef3ba">isValid</a>() ) {
<a name="l00228"></a>00228 <span class="keyword">const</span> Private* cd = d.<a class="codeRef" href="qshareddatapointer.html#constData">constData</a>();
<a name="l00229"></a>00229 cd->backend->close();
<a name="l00230"></a>00230 setError( cd->backend->lastError() );
<a name="l00231"></a>00231 }
<a name="l00232"></a>00232 }
<a name="l00233"></a>00233
<a name="l00234"></a>00234 <span class="keyword">template</span><<span class="keyword">typename</span> T> <span class="keywordtype">bool</span> <a class="code" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Soprano::Iterator<T>::next</a>()
<a name="l00235"></a>00235 {
<a name="l00236"></a>00236 <span class="comment">// some evil hacking to avoid detachment of the shared data</span>
<a name="l00237"></a>00237 <span class="keyword">const</span> Private* cd = d.<a class="codeRef" href="qshareddatapointer.html#constData">constData</a>();
<a name="l00238"></a>00238 <span class="keywordflow">if</span>( <a class="code" href="classSoprano_1_1Inference_1_1StatementPattern.html#aa501329dbaf6fe6a0a200307f90ef3ba">isValid</a>() ) {
<a name="l00239"></a>00239 <span class="keywordtype">bool</span> hasNext = cd->backend->next();
<a name="l00240"></a>00240 setError( cd->backend->lastError() );
<a name="l00241"></a>00241 <span class="keywordflow">if</span>( !hasNext ) {
<a name="l00242"></a>00242 cd->backend->close();
<a name="l00243"></a>00243 }
<a name="l00244"></a>00244 <span class="keywordflow">return</span> hasNext;
<a name="l00245"></a>00245 }
<a name="l00246"></a>00246 <span class="keywordflow">else</span> {
<a name="l00247"></a>00247 setError( <a class="codeRef" href="qstring.html#fromLatin1">QString::fromLatin1</a>( <span class="stringliteral">"Invalid iterator."</span> ) );
<a name="l00248"></a>00248 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00249"></a>00249 }
<a name="l00250"></a>00250 }
<a name="l00251"></a>00251
<a name="l00252"></a>00252 <span class="keyword">template</span><<span class="keyword">typename</span> T> T <a class="code" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Soprano::Iterator<T>::current</a>()<span class="keyword"> const</span>
<a name="l00253"></a>00253 <span class="keyword"></span>{
<a name="l00254"></a>00254 <span class="keywordflow">if</span>( <a class="code" href="classSoprano_1_1Inference_1_1StatementPattern.html#aa501329dbaf6fe6a0a200307f90ef3ba">isValid</a>() ){
<a name="l00255"></a>00255 T c = d->backend->current();
<a name="l00256"></a>00256 setError( d->backend->lastError() );
<a name="l00257"></a>00257 <span class="keywordflow">return</span> c;
<a name="l00258"></a>00258 }
<a name="l00259"></a>00259 <span class="keywordflow">else</span> {
<a name="l00260"></a>00260 setError( <a class="codeRef" href="qstring.html#fromLatin1">QString::fromLatin1</a>( <span class="stringliteral">"Invalid iterator."</span> ) );
<a name="l00261"></a>00261 <span class="keywordflow">return</span> T();
<a name="l00262"></a>00262 }
<a name="l00263"></a>00263 }
<a name="l00264"></a>00264
<a name="l00265"></a>00265 <span class="keyword">template</span><<span class="keyword">typename</span> T> T <a class="code" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Soprano::Iterator<T>::operator*</a>()<span class="keyword"> const</span>
<a name="l00266"></a>00266 <span class="keyword"></span>{
<a name="l00267"></a>00267 <span class="keywordflow">return</span> current();
<a name="l00268"></a>00268 }
<a name="l00269"></a>00269
<a name="l00270"></a>00270 <span class="keyword">template</span><<span class="keyword">typename</span> T> <span class="keywordtype">bool</span> <a class="code" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Soprano::Iterator<T>::isValid</a>()<span class="keyword"> const</span>
<a name="l00271"></a>00271 <span class="keyword"></span>{
<a name="l00272"></a>00272 <span class="keywordflow">return</span> d->backend != 0;
<a name="l00273"></a>00273 }
<a name="l00274"></a>00274
<a name="l00275"></a>00275
<a name="l00276"></a>00276 <span class="keyword">template</span><<span class="keyword">typename</span> T> <a class="codeRef" href="qlist.html">QList<T></a> <a class="code" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Soprano::Iterator<T>::allElements</a>()
<a name="l00277"></a>00277 {
<a name="l00278"></a>00278 <a class="codeRef" href="qlist.html">QList<T></a> sl;
<a name="l00279"></a>00279 <span class="keywordflow">if</span>( <a class="code" href="classSoprano_1_1Inference_1_1StatementPattern.html#aa501329dbaf6fe6a0a200307f90ef3ba">isValid</a>() ) {
<a name="l00280"></a>00280 <span class="keywordflow">while</span> ( next() ) {
<a name="l00281"></a>00281 sl.<a class="codeRef" href="qlist.html#append">append</a>( current() );
<a name="l00282"></a>00282 }
<a name="l00283"></a>00283 close();
<a name="l00284"></a>00284 }
<a name="l00285"></a>00285 <span class="keywordflow">return</span> sl;
<a name="l00286"></a>00286 }
<a name="l00289"></a>00289 <span class="preprocessor">#endif</span>
<a name="l00290"></a>00290 <span class="preprocessor"></span>
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