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| <div class="subTitle">org.apache.jasper.xmlparser</div> |
| <h2 title="Class SymbolTable" class="title">Class SymbolTable</h2> |
| </div> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <ul class="inheritance"> |
| <li>org.apache.jasper.xmlparser.SymbolTable</li> |
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| <pre>public class <span class="typeNameLabel">SymbolTable</span> |
| extends java.lang.Object</pre> |
| <div class="block">This class is a symbol table implementation that guarantees that |
| strings used as identifiers are unique references. Multiple calls |
| to <code>addSymbol</code> will always return the same string |
| reference. |
| <p> |
| The symbol table performs the same task as <code>String.intern()</code> |
| with the following differences: |
| <ul> |
| <li> |
| A new string object does not need to be created in order to |
| retrieve a unique reference. Symbols can be added by using |
| a series of characters in a character array. |
| </li> |
| <li> |
| Users of the symbol table can provide their own symbol hashing |
| implementation. For example, a simple string hashing algorithm |
| may fail to produce a balanced set of hashcodes for symbols |
| that are <em>mostly</em> unique. Strings with similar leading |
| characters are especially prone to this poor hashing behavior. |
| </li> |
| </ul></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><code>SymbolHash</code></dd> |
| </dl> |
| </li> |
| </ul> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>protected static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/jasper/xmlparser/SymbolTable.Entry.html" title="class in org.apache.jasper.xmlparser">SymbolTable.Entry</a></span></code> |
| <div class="block">This class is a symbol table entry.</div> |
| </td> |
| </tr> |
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| </li> |
| </ul> |
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| <h3>Field Summary</h3> |
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| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../org/apache/jasper/xmlparser/SymbolTable.Entry.html" title="class in org.apache.jasper.xmlparser">SymbolTable.Entry</a>[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/jasper/xmlparser/SymbolTable.html#fBuckets">fBuckets</a></span></code> |
| <div class="block">Buckets.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>protected int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/jasper/xmlparser/SymbolTable.html#fTableSize">fTableSize</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/jasper/xmlparser/SymbolTable.html#TABLE_SIZE">TABLE_SIZE</a></span></code> |
| <div class="block">Default table size.</div> |
| </td> |
| </tr> |
| </table> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/jasper/xmlparser/SymbolTable.html#SymbolTable--">SymbolTable</a></span>()</code> |
| <div class="block">Constructs a symbol table with a default number of buckets.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/jasper/xmlparser/SymbolTable.html#SymbolTable-int-">SymbolTable</a></span>(int tableSize)</code> |
| <div class="block">Constructs a symbol table with a specified number of buckets.</div> |
| </td> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/jasper/xmlparser/SymbolTable.html#addSymbol-char:A-int-int-">addSymbol</a></span>(char[] buffer, |
| int offset, |
| int length)</code> |
| <div class="block">Adds the specified symbol to the symbol table and returns a |
| reference to the unique symbol.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/jasper/xmlparser/SymbolTable.html#addSymbol-java.lang.String-">addSymbol</a></span>(java.lang.String symbol)</code> |
| <div class="block">Adds the specified symbol to the symbol table and returns a |
| reference to the unique symbol.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/jasper/xmlparser/SymbolTable.html#containsSymbol-char:A-int-int-">containsSymbol</a></span>(char[] buffer, |
| int offset, |
| int length)</code> |
| <div class="block">Returns true if the symbol table already contains the specified |
| symbol.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/jasper/xmlparser/SymbolTable.html#containsSymbol-java.lang.String-">containsSymbol</a></span>(java.lang.String symbol)</code> |
| <div class="block">Returns true if the symbol table already contains the specified |
| symbol.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/jasper/xmlparser/SymbolTable.html#hash-char:A-int-int-">hash</a></span>(char[] buffer, |
| int offset, |
| int length)</code> |
| <div class="block">Returns a hashcode value for the specified symbol information.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/jasper/xmlparser/SymbolTable.html#hash-java.lang.String-">hash</a></span>(java.lang.String symbol)</code> |
| <div class="block">Returns a hashcode value for the specified symbol.</div> |
| </td> |
| </tr> |
| </table> |
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| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <h4>TABLE_SIZE</h4> |
| <pre>protected static final int TABLE_SIZE</pre> |
| <div class="block">Default table size.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.jasper.xmlparser.SymbolTable.TABLE_SIZE">Constant Field Values</a></dd> |
| </dl> |
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| <h4>fBuckets</h4> |
| <pre>protected <a href="../../../../org/apache/jasper/xmlparser/SymbolTable.Entry.html" title="class in org.apache.jasper.xmlparser">SymbolTable.Entry</a>[] fBuckets</pre> |
| <div class="block">Buckets.</div> |
| </li> |
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| <h4>fTableSize</h4> |
| <pre>protected int fTableSize</pre> |
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| </a> |
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| <h4>SymbolTable</h4> |
| <pre>public SymbolTable()</pre> |
| <div class="block">Constructs a symbol table with a default number of buckets.</div> |
| </li> |
| </ul> |
| <a name="SymbolTable-int-"> |
| <!-- --> |
| </a> |
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| <li class="blockList"> |
| <h4>SymbolTable</h4> |
| <pre>public SymbolTable(int tableSize)</pre> |
| <div class="block">Constructs a symbol table with a specified number of buckets.</div> |
| </li> |
| </ul> |
| </li> |
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| <h4>addSymbol</h4> |
| <pre>public java.lang.String addSymbol(java.lang.String symbol)</pre> |
| <div class="block">Adds the specified symbol to the symbol table and returns a |
| reference to the unique symbol. If the symbol already exists, |
| the previous symbol reference is returned instead, in order |
| guarantee that symbol references remain unique.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>symbol</code> - The new symbol.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <!-- --> |
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| <h4>addSymbol</h4> |
| <pre>public java.lang.String addSymbol(char[] buffer, |
| int offset, |
| int length)</pre> |
| <div class="block">Adds the specified symbol to the symbol table and returns a |
| reference to the unique symbol. If the symbol already exists, |
| the previous symbol reference is returned instead, in order |
| guarantee that symbol references remain unique.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>buffer</code> - The buffer containing the new symbol.</dd> |
| <dd><code>offset</code> - The offset into the buffer of the new symbol.</dd> |
| <dd><code>length</code> - The length of the new symbol in the buffer.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <!-- --> |
| </a> |
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| <h4>hash</h4> |
| <pre>public int hash(java.lang.String symbol)</pre> |
| <div class="block">Returns a hashcode value for the specified symbol. The value |
| returned by this method must be identical to the value returned |
| by the <code>hash(char[],int,int)</code> method when called |
| with the character array that comprises the symbol string.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>symbol</code> - The symbol to hash.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <!-- --> |
| </a> |
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| <h4>hash</h4> |
| <pre>public int hash(char[] buffer, |
| int offset, |
| int length)</pre> |
| <div class="block">Returns a hashcode value for the specified symbol information. |
| The value returned by this method must be identical to the value |
| returned by the <code>hash(String)</code> method when called |
| with the string object created from the symbol information.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>buffer</code> - The character buffer containing the symbol.</dd> |
| <dd><code>offset</code> - The offset into the character buffer of the start |
| of the symbol.</dd> |
| <dd><code>length</code> - The length of the symbol.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <!-- --> |
| </a> |
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| <h4>containsSymbol</h4> |
| <pre>public boolean containsSymbol(java.lang.String symbol)</pre> |
| <div class="block">Returns true if the symbol table already contains the specified |
| symbol.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>symbol</code> - The symbol to look for.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <!-- --> |
| </a> |
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| <h4>containsSymbol</h4> |
| <pre>public boolean containsSymbol(char[] buffer, |
| int offset, |
| int length)</pre> |
| <div class="block">Returns true if the symbol table already contains the specified |
| symbol.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>buffer</code> - The buffer containing the symbol to look for.</dd> |
| <dd><code>offset</code> - The offset into the buffer.</dd> |
| <dd><code>length</code> - The length of the symbol in the buffer.</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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