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<h2 align="center">Xalan-C++ API Documentation</h2>
<h3 align="center">The Xalan C++ XSLT Processor Version 1.10</h3>
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<hr><h1>ReusableArenaBlock.hpp</h1><a href="ReusableArenaBlock_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <font class="comment">/*</font>
00002 <font class="comment"> * Copyright 1999-2004 The Apache Software Foundation.</font>
00003 <font class="comment"> *</font>
00004 <font class="comment"> * Licensed under the Apache License, Version 2.0 (the "License");</font>
00005 <font class="comment"> * you may not use this file except in compliance with the License.</font>
00006 <font class="comment"> * You may obtain a copy of the License at</font>
00007 <font class="comment"> *</font>
00008 <font class="comment"> *     http://www.apache.org/licenses/LICENSE-2.0</font>
00009 <font class="comment"> *</font>
00010 <font class="comment"> * Unless required by applicable law or agreed to in writing, software</font>
00011 <font class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</font>
00012 <font class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</font>
00013 <font class="comment"> * See the License for the specific language governing permissions and</font>
00014 <font class="comment"> * limitations under the License.</font>
00015 <font class="comment"> */</font>
00016 
00017 <font class="preprocessor">#if !defined(REUSABLEARENABLOCK_INCLUDE_GUARD_1357924680)</font>
<a name="l00018"></a><a class="code" href="ReusableArenaBlock_8hpp.html#a0">00018</a> <font class="preprocessor"></font><font class="preprocessor">#define REUSABLEARENABLOCK_INCLUDE_GUARD_1357924680</font>
00019 <font class="preprocessor"></font>
00020 
00021 <font class="preprocessor">#include &lt;<a class="code" href="ArenaBlockBase_8hpp.html">xalanc/PlatformSupport/ArenaBlockBase.hpp</a>&gt;</font>
00022 
00023 
00024 
00025 <font class="preprocessor">#include &lt;<a class="code" href="XalanMemMgrAutoPtr_8hpp.html">xalanc/Include/XalanMemMgrAutoPtr.hpp</a>&gt;</font>
00026 
00027 
00028 
00029 XALAN_CPP_NAMESPACE_BEGIN
00030 
00031 
00032 
00033 <font class="keyword">template</font> &lt;<font class="keyword">class </font><a class="code" href="classXalanSourceTreeAttr.html">ObjectType</a>,
00034 <font class="preprocessor">#if defined(XALAN_NO_DEFAULT_TEMPLATE_ARGUMENTS)</font>
00035 <font class="preprocessor"></font>         <font class="keyword">class </font>SizeType&gt;
00036 <font class="preprocessor">#else</font>
00037 <font class="preprocessor"></font>         <font class="keyword">class </font>SizeType = unsigned short&gt;
00038 #endif
<a name="l00039"></a><a class="code" href="classReusableArenaBlock.html">00039</a> class <a class="code" href="classReusableArenaBlock.html">ReusableArenaBlock</a> : <font class="keyword">public</font> <a class="code" href="classArenaBlockBase.html">ArenaBlockBase</a>&lt;ObjectType, SizeType&gt;
00040 {
00041 
00042 <font class="keyword">public</font>:
00043 
<a name="l00044"></a><a class="code" href="classReusableArenaBlock.html#s0">00044</a>     <font class="keyword">typedef</font> <a class="code" href="classArenaBlockBase.html">ArenaBlockBase&lt;ObjectType, SizeType&gt;</a>        <a class="code" href="classstd_1_1unary__function.html">BaseClassType</a>;
00045 
<a name="l00046"></a><a class="code" href="classReusableArenaBlock.html#s1">00046</a>     <font class="keyword">typedef</font> <font class="keyword">typename</font> BaseClassType::size_type           size_type;
00047 
<a name="l00048"></a><a class="code" href="classReusableArenaBlock.html#s2">00048</a>     <font class="keyword">typedef</font> <a class="code" href="classReusableArenaBlock.html">ReusableArenaBlock&lt;ObjectType, SizeType&gt;</a>    <a class="code" href="classXalanDeque.html">ThisType</a>;
00049 
<a name="l00050"></a><a class="code" href="structReusableArenaBlock_1_1NextBlock.html">00050</a>     <font class="keyword">struct </font>NextBlock
00051     {
00052         <font class="keyword">enum</font> { VALID_OBJECT_STAMP = 0xffddffdd };
00053 
<a name="l00054"></a><a class="code" href="structReusableArenaBlock_1_1NextBlock.html#m0">00054</a>         size_type       next;
<a name="l00055"></a><a class="code" href="structReusableArenaBlock_1_1NextBlock.html#m1">00055</a>         <font class="keyword">const</font> <font class="keywordtype">int</font>       verificationStamp;
00056         
<a name="l00057"></a><a class="code" href="structReusableArenaBlock_1_1NextBlock.html#a0">00057</a>         <a class="code" href="structReusableArenaBlock_1_1NextBlock.html#a0">NextBlock</a>( size_type _next):
00058             next(_next),
00059             verificationStamp(VALID_OBJECT_STAMP)
00060         {
00061         }
00062 
00063         <font class="keywordtype">bool</font>
<a name="l00064"></a><a class="code" href="structReusableArenaBlock_1_1NextBlock.html#a1">00064</a>         <a class="code" href="structReusableArenaBlock_1_1NextBlock.html#a1">isValidFor</a>( size_type  rightBorder )<font class="keyword"> const</font>
00065 <font class="keyword">        </font>{
00066             <font class="keywordflow">return</font> ( ( verificationStamp == int(VALID_OBJECT_STAMP)) &amp;&amp;
00067                 ( next &lt;= rightBorder ) ) ? <font class="keyword">true</font> : <font class="keyword">false</font> ;
00068         }
00069 
00070         <font class="keyword">static</font> NextBlock*
<a name="l00071"></a><a class="code" href="structReusableArenaBlock_1_1NextBlock.html#d0">00071</a>         <a class="code" href="structReusableArenaBlock_1_1NextBlock.html#d0">cast</a>(<font class="keywordtype">void</font>*  thePointer)<font class="keyword"></font>
00072 <font class="keyword">        </font>{
00073             <font class="keywordflow">return</font> reinterpret_cast&lt;NextBlock*&gt;(thePointer);
00074         }
00075 
00076         <font class="keyword">static</font> <font class="keyword">const</font> NextBlock*
<a name="l00077"></a><a class="code" href="structReusableArenaBlock_1_1NextBlock.html#d1">00077</a>         <a class="code" href="structReusableArenaBlock_1_1NextBlock.html#d0">cast</a>(<font class="keyword">const</font> <font class="keywordtype">void</font>*    thePointer)<font class="keyword"></font>
00078 <font class="keyword">        </font>{
00079             <font class="keywordflow">return</font> reinterpret_cast&lt;const NextBlock*&gt;(thePointer);
00080         }
00081     };
00082 
00083     <font class="comment">/*</font>
00084 <font class="comment">     * Construct an ArenaBlock of the specified size</font>
00085 <font class="comment">     * of objects.</font>
00086 <font class="comment">     *</font>
00087 <font class="comment">     * @param theBlockSize The size of the block (the</font>
00088 <font class="comment">     * number of objects it can contain).</font>
00089 <font class="comment">     */</font>
<a name="l00090"></a><a class="code" href="classReusableArenaBlock.html#a0">00090</a>     <a class="code" href="classReusableArenaBlock.html#a0">ReusableArenaBlock</a>(
00091                 MemoryManagerType&amp;  theManager,
00092                 size_type           theBlockSize) :
00093         <a class="code" href="classstd_1_1unary__function.html">BaseClassType</a>(theManager, theBlockSize),
00094         m_firstFreeBlock(0),
00095         m_nextFreeBlock(0)
00096 
00097     {
00098         XALAN_STATIC_ASSERT(<font class="keyword">sizeof</font>(<a class="code" href="classXalanSourceTreeAttr.html">ObjectType</a>) &gt;= <font class="keyword">sizeof</font>(NextBlock));
00099         
00100         <font class="keywordflow">for</font>( size_type i = 0; i &lt; this-&gt;m_blockSize; ++i )
00101         {
00102             <font class="keyword">new</font> (&amp;this-&gt;m_objectBlock[i]) NextBlock(<a class="code" href="classArenaBlockBase.html#s2">size_type</a>(i + 1));
00103         }
00104     }
00105 
<a name="l00106"></a><a class="code" href="classReusableArenaBlock.html#a1">00106</a>     <a class="code" href="classReusableArenaBlock.html#a1">~ReusableArenaBlock</a>()<font class="keyword"></font>
00107 <font class="keyword">    </font>{
00108         size_type removedObjects = 0;
00109 
00110         <font class="keywordflow">for</font> (size_type i = 0;
00111                 i &lt; this-&gt;m_blockSize &amp;&amp;
00112                 removedObjects &lt; this-&gt;m_objectCount;
00113                     ++i)
00114         {
00115             NextBlock* <font class="keyword">const</font>    pStruct =
00116                 NextBlock::cast(&amp;this-&gt;m_objectBlock[i]);
00117 
00118             <font class="keywordflow">if</font> ( <a class="code" href="classReusableArenaBlock.html#b1">isOccupiedBlock</a>(pStruct) )
00119             {
00120                 this-&gt;m_objectBlock[i].~ObjectType();
00121 
00122                 ++removedObjects;
00123             }
00124         }
00125     }
00126 
00127     <font class="keyword">static</font> <a class="code" href="classXalanDeque.html">ThisType</a>*
<a name="l00128"></a><a class="code" href="classReusableArenaBlock.html#d0">00128</a>     <a class="code" href="classReusableArenaBlock.html#d0">create</a>(
00129                 MemoryManagerType&amp;  theManager,
00130                 size_type           theBlockSize)<font class="keyword"></font>
00131 <font class="keyword">    </font>{
00132         <a class="code" href="classXalanDeque.html">ThisType</a>* theInstance;
00133 
00134         <font class="keywordflow">return</font> <a class="code" href="XalanMemoryManagement_8hpp.html#a17">XalanConstruct</a>(
00135                     theManager,
00136                     theInstance,
00137                     theManager,
00138                     theBlockSize);
00139     }
00140 
00141     <font class="comment">/*</font>
00142 <font class="comment">     * Allocate a block.  Once the object is constructed, you must call</font>
00143 <font class="comment">     * commitAllocation().</font>
00144 <font class="comment">     *</font>
00145 <font class="comment">     * @return a pointer to the new block.</font>
00146 <font class="comment">     */</font>
00147     <a class="code" href="classXalanSourceTreeAttr.html">ObjectType</a>*
<a name="l00148"></a><a class="code" href="classReusableArenaBlock.html#a2">00148</a>     <a class="code" href="classReusableArenaBlock.html#a2">allocateBlock</a>()<font class="keyword"></font>
00149 <font class="keyword">    </font>{
00150         <font class="keywordflow">if</font> ( this-&gt;m_objectCount == this-&gt;m_blockSize )
00151         {
00152             assert ( this-&gt;m_firstFreeBlock == (this-&gt;m_blockSize + 1) );
00153 
00154             <font class="keywordflow">return</font> 0;
00155         }
00156         <font class="keywordflow">else</font>
00157         {
00158             assert( this-&gt;m_objectCount &lt; this-&gt;m_blockSize );
00159 
00160             <a class="code" href="classXalanSourceTreeAttr.html">ObjectType</a>*     theResult = 0;
00161 
00162             assert ( this-&gt;m_firstFreeBlock &lt;= this-&gt;m_blockSize );
00163             assert ( this-&gt;m_nextFreeBlock &lt;= this-&gt;m_blockSize );
00164 
00165             <font class="comment">// check if any part was allocated but not commited</font>
00166             <font class="keywordflow">if</font>(this-&gt;m_firstFreeBlock != this-&gt;m_nextFreeBlock)
00167             {
00168                 <font class="comment">// return the previously allocated block and wait for a commit</font>
00169                 theResult = this-&gt;m_objectBlock + this-&gt;m_firstFreeBlock;
00170             }
00171             <font class="keywordflow">else</font>
00172             {
00173                 theResult = this-&gt;m_objectBlock + this-&gt;m_firstFreeBlock;
00174 
00175                 assert(<a class="code" href="classArenaBlockBase.html#s2">size_type</a>(theResult - this-&gt;m_objectBlock) &lt; this-&gt;m_blockSize);
00176 
00177                 this-&gt;m_nextFreeBlock = NextBlock::cast(theResult)-&gt;next;
00178 
00179                 assert(NextBlock::cast(theResult)-&gt;isValidFor(this-&gt;m_blockSize));
00180                 assert(this-&gt;m_nextFreeBlock &lt;= this-&gt;m_blockSize);
00181 
00182                 ++this-&gt;m_objectCount;
00183             }
00184 
00185             <font class="keywordflow">return</font> theResult;
00186         }
00187     }
00188 
00189     <font class="comment">/*</font>
00190 <font class="comment">     * Commit the previous allocation.</font>
00191 <font class="comment">     *</font>
00192 <font class="comment">     * @param theBlock the address that was returned by allocateBlock()</font>
00193 <font class="comment">     */</font>
00194     <font class="keywordtype">void</font>
<a name="l00195"></a><a class="code" href="classReusableArenaBlock.html#a3">00195</a>     <a class="code" href="classReusableArenaBlock.html#a3">commitAllocation</a>(<a class="code" href="classXalanSourceTreeAttr.html">ObjectType</a>* <font class="comment">/* theBlock */</font>)<font class="keyword"></font>
00196 <font class="keyword">    </font>{
00197         assert ( this-&gt;m_objectCount &lt;= this-&gt;m_blockSize );
00198 
00199         this-&gt;m_firstFreeBlock = this-&gt;m_nextFreeBlock;
00200     }
00201 
00202     <font class="comment">/*</font>
00203 <font class="comment">     * Destroy the object, and return the block to the free list.</font>
00204 <font class="comment">     * The behavior is undefined if the object pointed to is not</font>
00205 <font class="comment">     * owned by the block.</font>
00206 <font class="comment">     *</font>
00207 <font class="comment">     * @param theObject the address of the object.</font>
00208 <font class="comment">     */</font>
00209     <font class="keywordtype">void</font>
<a name="l00210"></a><a class="code" href="classReusableArenaBlock.html#a4">00210</a>     <a class="code" href="classReusableArenaBlock.html#a4">destroyObject</a>(<a class="code" href="classXalanSourceTreeAttr.html">ObjectType</a>*   theObject)<font class="keyword"></font>
00211 <font class="keyword">    </font>{
00212         assert(theObject != 0);
00213 
00214         <font class="comment">// check if any uncommited block is there, add it to the list</font>
00215         <font class="keywordflow">if</font> ( this-&gt;m_firstFreeBlock != this-&gt;m_nextFreeBlock )
00216         {
00217             <font class="comment">// Return it to the pool of free blocks</font>
00218             <font class="keywordtype">void</font>* <font class="keyword">const</font>     p = this-&gt;m_objectBlock + this-&gt;m_firstFreeBlock;
00219 
00220             <font class="keyword">new</font> (p) NextBlock(this-&gt;m_nextFreeBlock);
00221 
00222             this-&gt;m_nextFreeBlock = this-&gt;m_firstFreeBlock;
00223         }
00224 
00225         assert(<a class="code" href="classReusableArenaBlock.html#a5">ownsObject</a>(theObject) == <font class="keyword">true</font>);
00226         assert(<a class="code" href="classReusableArenaBlock.html#b0">shouldDestroyBlock</a>(theObject));
00227 
00228         <a class="code" href="XalanMemoryManagement_8hpp.html#a10">XalanDestroy</a>(*theObject);
00229 
00230         <font class="keyword">new</font> (theObject) NextBlock(this-&gt;m_firstFreeBlock);
00231 
00232         m_firstFreeBlock =
00233             this-&gt;m_nextFreeBlock =
00234             <a class="code" href="classArenaBlockBase.html#s2">size_type</a>(theObject - this-&gt;m_objectBlock);
00235 
00236         assert (this-&gt;m_firstFreeBlock &lt;= this-&gt;m_blockSize);
00237 
00238         --this-&gt;m_objectCount;
00239     }
00240 
00241     <font class="comment">/*</font>
00242 <font class="comment">     * Determine if this block owns the specified object.  Note</font>
00243 <font class="comment">     * that even if the object address is within our block, this</font>
00244 <font class="comment">     * call will return false if no object currently occupies the</font>
00245 <font class="comment">     * block.  See also ownsBlock().</font>
00246 <font class="comment">     *</font>
00247 <font class="comment">     * @param theObject the address of the object.</font>
00248 <font class="comment">     * @return true if we own the object, false if not.</font>
00249 <font class="comment">     */</font>
00250     <font class="keywordtype">bool</font>
<a name="l00251"></a><a class="code" href="classReusableArenaBlock.html#a5">00251</a>     <a class="code" href="classReusableArenaBlock.html#a5">ownsObject</a>(<font class="keyword">const</font> <a class="code" href="classXalanSourceTreeAttr.html">ObjectType</a>*    theObject)<font class="keyword"> const</font>
00252 <font class="keyword">    </font>{
00253         assert ( theObject != 0 );
00254 
00255         <font class="keywordflow">return</font> <a class="code" href="classReusableArenaBlock.html#b1">isOccupiedBlock</a>(NextBlock::cast(theObject));
00256     }
00257 
00258 <font class="keyword">protected</font>:
00259 
00260     <font class="comment">/*</font>
00261 <font class="comment">     * Determine if the block should be destroyed.  Returns true,</font>
00262 <font class="comment">     * unless the object is on the free list.  The behavior is</font>
00263 <font class="comment">     * undefined if the object pointed to is not owned by the</font>
00264 <font class="comment">     * block.</font>
00265 <font class="comment">     *</font>
00266 <font class="comment">     * @param theObject the address of the object</font>
00267 <font class="comment">     * @return true if block should be destroyed, false if not.</font>
00268 <font class="comment">     */</font>
00269     <font class="keywordtype">bool</font>
<a name="l00270"></a><a class="code" href="classReusableArenaBlock.html#b0">00270</a>     <a class="code" href="classReusableArenaBlock.html#b0">shouldDestroyBlock</a>(<font class="keyword">const</font> <a class="code" href="classXalanSourceTreeAttr.html">ObjectType</a>*    theObject)<font class="keyword"> const</font>
00271 <font class="keyword">    </font>{
00272         assert(<a class="code" href="classArenaBlockBase.html#s2">size_type</a>(theObject - this-&gt;m_objectBlock) &lt; this-&gt;m_blockSize);
00273 
00274         <font class="keywordflow">return</font> !isOnFreeList(theObject);
00275     }
00276 
00277     <font class="keywordtype">bool</font>
<a name="l00278"></a><a class="code" href="classReusableArenaBlock.html#b1">00278</a>     <a class="code" href="classReusableArenaBlock.html#b1">isOccupiedBlock</a>(<font class="keyword">const</font> NextBlock*    block)<font class="keyword"> const</font>
00279 <font class="keyword">    </font>{
00280         assert( block !=0 );
00281 
00282         <font class="keywordflow">return</font> !(this-&gt;<a class="code" href="classArenaBlockBase.html#a5">ownsBlock</a>(reinterpret_cast&lt;const ObjectType*&gt;(block)) &amp;&amp;
00283                  block-&gt;isValidFor(this-&gt;m_blockSize));
00284     }
00285 
00286 <font class="keyword">private</font>:
00287 
00288     <font class="comment">// Not implemented...</font>
00289     <a class="code" href="classReusableArenaBlock.html#a0">ReusableArenaBlock</a>(<font class="keyword">const</font> <a class="code" href="classReusableArenaBlock.html">ReusableArenaBlock&lt;ObjectType, SizeType&gt;</a>&amp;);
00290 
00291     <a class="code" href="classReusableArenaBlock.html">ReusableArenaBlock&lt;ObjectType, SizeType&gt;</a>&amp;
00292     operator=(<font class="keyword">const</font> <a class="code" href="classReusableArenaBlock.html">ReusableArenaBlock&lt;ObjectType, SizeType&gt;</a>&amp;);
00293 
00294     <font class="keywordtype">bool</font>
00295     <a class="code" href="ElemAttributeSet_8hpp.html#a1">operator==</a>(<font class="keyword">const</font> <a class="code" href="classReusableArenaBlock.html">ReusableArenaBlock&lt;ObjectType, SizeType&gt;</a>&amp;) <font class="keyword">const</font>;
00296 
00297 
00298     <font class="comment">/*</font>
00299 <font class="comment">     * Determine if the block is on the free list.  The behavior is</font>
00300 <font class="comment">     * undefined if the object pointed to is not owned by the</font>
00301 <font class="comment">     * block.</font>
00302 <font class="comment">     *</font>
00303 <font class="comment">     * @param theObject the address of the object</font>
00304 <font class="comment">     * @return true if block is on the free list, false if not.</font>
00305 <font class="comment">     */</font>
00306     <font class="keywordtype">bool</font>
00307     isOnFreeList(<font class="keyword">const</font> <a class="code" href="classXalanSourceTreeAttr.html">ObjectType</a>*  theObject)<font class="keyword"> const</font>
00308 <font class="keyword">    </font>{
00309         <font class="keywordflow">if</font> ( this-&gt;m_objectCount == 0 )
00310         {
00311             <font class="keywordflow">return</font> <font class="keyword">false</font>;
00312         }
00313         <font class="keywordflow">else</font>
00314         {
00315             <a class="code" href="classXalanSourceTreeAttr.html">ObjectType</a>*     pRunPtr = this-&gt;m_objectBlock + this-&gt;m_firstFreeBlock;
00316 
00317             <font class="keywordflow">for</font> (size_type i = 0;
00318                     i &lt; this-&gt;m_blockSize - this-&gt;m_objectCount;
00319                         ++i)
00320             {
00321                 assert(this-&gt;ownsBlock(pRunPtr));
00322 
00323                 <font class="keywordflow">if</font> (pRunPtr == theObject)
00324                 {
00325                     <font class="keywordflow">return</font> <font class="keyword">true</font>;
00326                 }
00327                 <font class="keywordflow">else</font>
00328                 {
00329                     NextBlock* <font class="keyword">const</font>    p = reinterpret_cast&lt;NextBlock*&gt;(pRunPtr);
00330 
00331                     assert(p-&gt;isValidFor(this-&gt;m_blockSize));
00332 
00333                     pRunPtr = this-&gt;m_objectBlock + p-&gt;next;
00334                 }
00335             }
00336 
00337             <font class="keywordflow">return</font> <font class="keyword">false</font>;
00338         }
00339     }
00340 
00341     <font class="comment">// Data members...</font>
00342     size_type   m_firstFreeBlock;
00343 
00344     size_type   m_nextFreeBlock;
00345 };
00346 
00347 
00348 
00349 XALAN_CPP_NAMESPACE_END
00350 
00351 
00352 
00353 <font class="preprocessor">#endif  // !defined(REUSABLEARENABLOCK_INCLUDE_GUARD_1357924680)</font>
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			<P ALIGN="CENTER"><IMG SRC="ApacheLogo.jpg" WIDTH="387" HEIGHT="100" ALIGN="BOTTOM" BORDER="0" ALT="Apache Logo">
		</TD>
	</TR>
</TABLE>