com.jstatcom.model

Class SymbolTable

java.lang.Object

com.jstatcom.model.SymbolTable

public class SymbolTable
extends java.lang.Object

This class contains a sorted collection of Symbol objects that can easily be accessed.

This class is thread-save. All access to mutable data is synchronized.

Field Summary

Fields

Modifier and Type	Field and Description
java.lang.String	NAME Identifier of this table (always upper case).
static XmlFormat<SymbolTable>	SymbolTable_XML XML format field for (de)serialization.

Constructor Summary

Constructors

Constructor and Description
SymbolTable(java.lang.String name) Creates an empty symbol table with name, and no parent.
SymbolTable(java.lang.String name, boolean addToTree) Creates an empty symbol table with name, and no parent.
SymbolTable(java.lang.String name, SymbolTable parentTable) Creates an empty symbol table with name and a parent table.
SymbolTable(java.lang.String name, SymbolTable parentTable, boolean addToTree) Creates an empty symbol table with name and a parent table.

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all elements from this collection.
boolean	contains(java.lang.String symbolName) Gets whether this symbol table contains a symbol with name symbolName.
Symbol	get(JSCTypeDef def) Gets the symbol with def.name.
JSCData	getJSCData(JSCTypeDef def) Gets the JSCData stored in the symbol with given def.name.
java.lang.String	getName() Gets the name of this symbol table.
SymbolTable	getParentTable() Gets the symbol table that is referenced as a parent of this table.
Symbol	getSymbol(java.lang.String name) Gets the symbol with the given name or null if none is contained with the given name.
SymbolTableTreeNode	getSymbolTableNode() Gets the symbol table node that represents this table in a SymbolTree.
boolean	isEmpty() Gets whether this list is empty.
java.util.Iterator	iterator() Gets an Iterator for the symbols stored in this collection.
boolean	remove(java.lang.String name) Removes the symbol with name from this collection.
void	set(JSCData data) Adds a new JSCData object to the collection.
void	set(JSCData[] data) Adds an array of JSCData objects to the collection.
void	set(java.lang.String symbolName, JSCData data) Adds a new JSCData object to the collection.
void	setSymbol(Symbol symbol) Puts a new symbol into the collection.
void	setSymbolTable(SymbolTable table) Sets the contents of table to this symbol table by applying the following rules: if a symbol is only part of table but not of this, then a new symbol with the same name is created in this table and the reference to the underlying JSCData instance is copied if table and this contain symbols with the same name, then the reference to the underlying JSCData instance is copied from the symbol of the argument table to this table all symbols that are part of this table but not of the argument table are left untouched
void	setSymbolTableNode(SymbolTableTreeNode node) Sets the symbol table node that represents this table in a SymbolTree.
int	size() Gets the number of stored symbols in this collection.
java.lang.String	toString() Returns a string that represents the value of this object.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

NAME

public final java.lang.String NAME

Identifier of this table (always upper case).

SymbolTable_XML

public static final XmlFormat<SymbolTable> SymbolTable_XML

XML format field for (de)serialization.

Constructor Detail

SymbolTable

public SymbolTable(java.lang.String name)

Creates an empty symbol table with name, and no parent. It will be added to the symbol tree.

Parameters:

name - the identifier of that SymbolTable

SymbolTable

public SymbolTable(java.lang.String name,
                   boolean addToTree)

Creates an empty symbol table with name, and no parent. It can optionally be added to the symbol tree.

Parameters:

name - the identifier of that SymbolTable

addToTree - if true then this table will be added to the symbol tree, otherwise it will not be added

SymbolTable

public SymbolTable(java.lang.String name,
                   SymbolTable parentTable)

Creates an empty symbol table with name and a parent table. It will be added to the symbol tree.

Parameters:

name - the identifier of that SymbolTable

parentTable - the parent table, will be parent node in symbol tree

SymbolTable

public SymbolTable(java.lang.String name,
                   SymbolTable parentTable,
                   boolean addToTree)

Creates an empty symbol table with name and a parent table. It can optionally be added to the symbol tree.

Parameters:

name - the identifier of that SymbolTable

parentTable - the parent table, will be parent node in symbol tree

addToTree - if true then this table will be added to the symbol tree, otherwise it will not be added

Method Detail

set

public final void set(JSCData[] data)

Adds an array of JSCData objects to the collection.

Parameters:

data - the JSCData array to put

Throws:

java.lang.IllegalArgumentException - if (data == null)
or if a symbol with data[i].getName() but with a different type already exists

set

public final void set(JSCData data)

Adds a new JSCData object to the collection. If a symbol with the same name as data is already contained, data will be set for that symbol. If no symbol of data.getName() is contained, then a new symbol will be created and added.

Parameters:

data - the JSCData object to put

Throws:

java.lang.IllegalArgumentException - if (data == null)
or if a symbol with data.getName() but with a different type already exists

set

public final void set(java.lang.String symbolName,
                      JSCData data)

Adds a new JSCData object to the collection. If a symbol with the name symbolName is already contained, data will be set for that symbol. If no symbol of symbolName is contained, then a new symbol will be created and added.

Parameters:

symbolName - the name of the symbol to be created

data - the JSCData object to put

Throws:

java.lang.IllegalArgumentException - if (data == null || symbolName == null)
or if a symbol with symbolName but with a different type already exists
or if symbolName is not a valid name as defined in JSCConstants

setSymbol

public final void setSymbol(Symbol symbol)

Puts a new symbol into the collection. The symbol is put on a position that keeps the underlying collection alphabetically sorted without respect to the case. If a symbol with the same name is alread contained, then the data and listeners are copied to the existing symbol.

Parameters:

symbol - the Symbol object to put

Throws:

java.lang.IllegalArgumentException - if (symbol == null)

clear

public final void clear()

Removes all elements from this collection.

Usage Note:
Removing a symbol from the SymbolTable does not affect any SymbolListeners attached to that symbol. They are still notified about changes in the removed symbol and not informed if a new symbol with name is added. You might consider calling removeAllSymbolListeners before that symbol is removed if this is not what you want.

contains

public final boolean contains(java.lang.String symbolName)

Gets whether this symbol table contains a symbol with name symbolName.

Parameters:

symbolName - the name of the symbol to check for

Returns:

true if contained, false otherwise

getSymbol

public final Symbol getSymbol(java.lang.String name)

Gets the symbol with the given name or null if none is contained with the given name.

Usage Note:
Pleae notice the difference to the typesave get method. This does not create a new symbol if it is not contained yet, because it is not known, which type the new symbol should have.

Parameters:

name - the identifier for the symbol

Returns:

the symbol that was stored or a new empty symbol

Throws:

java.lang.IllegalArgumentException - if (name == null)

get

public final Symbol get(JSCTypeDef def)

Gets the symbol with def.name. If a symbol with that name does not yet exist an empty symbol of the given type is created, added and returned.

Parameters:

def - the type definition for the symbol

Returns:

the symbol that was stored or a new empty symbol

Throws:

java.lang.IllegalArgumentException - if (def == null)

java.lang.RuntimeException - if the retrieved symbol has a different type

getJSCData

public final JSCData getJSCData(JSCTypeDef def)

Gets the JSCData stored in the symbol with given def.name. If a symbol with that name does not yet exist, a symbol of the given type is created, added and an empty JSCData object is returned.

Instead of calling this method, one of the convenience methods for special JSCDataTypes can be used.

Parameters:

def - the type definition for the symbol

Returns:

the JSCData that was stored or a new empty data object

Throws:

java.lang.IllegalArgumentException - if (def == null)

java.lang.RuntimeException - if the retrieved symbol has a different type

getName

public final java.lang.String getName()

Gets the name of this symbol table.

Returns:

the name

isEmpty

public final boolean isEmpty()

Gets whether this list is empty.

Returns:

true if no elements are contained, false otherwise

iterator

public final java.util.Iterator iterator()

Gets an Iterator for the symbols stored in this collection. The iterator is guaranteed to walk through all stored symbols in alphabetical order, starting with the lowest.

Usage Note:
Clients must deal with synchronization while traversing this iterator, because this can change during that operation. The simplest way is to lock this symbol table during the entire traversal. If clients can make sure that no other threads access this symbol table during traversal, locking can be ommitted.

Returns:

an Iterator for all symbols

remove

public final boolean remove(java.lang.String name)

Removes the symbol with name from this collection. The case of the name makes no difference.

Usage Note:
Removing a symbol from the SymbolTable does not affect any SymbolListeners attached to that symbol. They are still notified about changes in the removed symbol and not informed if a new symbol with name is added. You might consider calling removeAllSymbolListeners before that symbol is removed if this is not what you want.

Parameters:

name - the identifier for the symbol to remove.

Returns:

true if this list contained the specified element

Throws:

java.lang.IllegalArgumentException - if (name == null)

See Also:

Symbol.equals(java.lang.Object)

size

public final int size()

Gets the number of stored symbols in this collection.

Returns:

the size

toString

public final java.lang.String toString()

Returns a string that represents the value of this object.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of the receiver

getParentTable

public final SymbolTable getParentTable()

Gets the symbol table that is referenced as a parent of this table.

Returns:

a symbol table

setSymbolTableNode

public void setSymbolTableNode(SymbolTableTreeNode node)

Sets the symbol table node that represents this table in a SymbolTree.

Parameters:

node - to representthis table

getSymbolTableNode

public SymbolTableTreeNode getSymbolTableNode()

Gets the symbol table node that represents this table in a SymbolTree.

Returns:

node representing this table

setSymbolTable

public void setSymbolTable(SymbolTable table)

Sets the contents of table to this symbol table by applying the following rules:

• if a symbol is only part of table but not of this, then a new symbol with the same name is created in this table and the reference to the underlying JSCData instance is copied
• if table and this contain symbols with the same name, then the reference to the underlying JSCData instance is copied from the symbol of the argument table to this table
• all symbols that are part of this table but not of the argument table are left untouched

This operation does not change the argument symbol table, but by copying references its symbols might be affected by operations on this table afterwards.

This method does not copy any listeners from table to this. Listeners of this table are not changed by this operation, except that they are notified via events in case of relevant changes.

Parameters:

table - the symbol table from which symbol are copied to this table

Throws:

java.lang.IllegalArgumentException - if (table == null)