org.apache.xerces.util
Class SoftReferenceSymbolTable
public class SoftReferenceSymbolTable
This symbol table uses SoftReferences to its String entries, which means that table entries
that have no references to them can be garbage collected when memory is needed. Thus, in
documents with very very large numbers of unique strings, using this SymbolTable will prevent
an out of memory error from occuring.
$Id: SoftReferenceSymbolTable.java 477799 2006-11-21 18:18:19Z mrglavas $
SoftReferenceSymbolTable() - Constructs a new, empty SymbolTable with a default initial capacity (101)
and load factor, which is 0.75.
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SoftReferenceSymbolTable(int initialCapacity) - Constructs a new, empty SymbolTable with the specified initial capacity
and default load factor, which is 0.75.
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SoftReferenceSymbolTable(int initialCapacity, float loadFactor) - Constructs a new, empty SymbolTable with the specified initial
capacity and the specified load factor.
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String | addSymbol(String symbol) - Adds the specified symbol to the symbol table and returns a
reference to the unique symbol.
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String | addSymbol(char[] buffer, int offset, int length) - Adds the specified symbol to the symbol table and returns a
reference to the unique symbol.
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boolean | containsSymbol(String symbol) - Returns true if the symbol table already contains the specified
symbol.
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boolean | containsSymbol(char[] buffer, int offset, int length) - Returns true if the symbol table already contains the specified
symbol.
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protected void | rehash() - Increases the capacity of and internally reorganizes this
SymbolTable, in order to accommodate and access its entries more
efficiently.
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SoftReferenceSymbolTable
public SoftReferenceSymbolTable()
Constructs a new, empty SymbolTable with a default initial capacity (101)
and load factor, which is 0.75.
SoftReferenceSymbolTable
public SoftReferenceSymbolTable(int initialCapacity)
Constructs a new, empty SymbolTable with the specified initial capacity
and default load factor, which is 0.75.
initialCapacity
- the initial capacity of the hashtable.
SoftReferenceSymbolTable
public SoftReferenceSymbolTable(int initialCapacity,
float loadFactor)
Constructs a new, empty SymbolTable with the specified initial
capacity and the specified load factor.
initialCapacity
- the initial capacity of the SymbolTable.loadFactor
- the load factor of the SymbolTable.
addSymbol
public String addSymbol(String symbol)
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.
- addSymbol in interface SymbolTable
addSymbol
public String addSymbol(char[] buffer,
int offset,
int length)
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.
- addSymbol in interface SymbolTable
buffer
- The buffer containing the new symbol.offset
- The offset into the buffer of the new symbol.length
- The length of the new symbol in the buffer.
containsSymbol
public boolean containsSymbol(String symbol)
Returns true if the symbol table already contains the specified
symbol.
- containsSymbol in interface SymbolTable
symbol
- The symbol to look for.
containsSymbol
public boolean containsSymbol(char[] buffer,
int offset,
int length)
Returns true if the symbol table already contains the specified
symbol.
- containsSymbol in interface SymbolTable
buffer
- The buffer containing the symbol to look for.offset
- The offset into the buffer.length
- The length of the symbol in the buffer.
rehash
protected void rehash()
Increases the capacity of and internally reorganizes this
SymbolTable, in order to accommodate and access its entries more
efficiently. This method is called automatically when the
number of keys in the SymbolTable exceeds this hashtable's capacity
and load factor.
- rehash in interface SymbolTable
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