org.teiid.query.sql.util

Class VariableContext

java.lang.Object

org.teiid.query.sql.util.VariableContext

public class VariableContext
extends Object

Constructor Summary

Constructors

Constructor and Description
VariableContext() Constructor for VariableContext.
VariableContext(boolean delegateSets)

Method Summary

Modifier and Type	Method and Description
void	clear()
boolean	containsVariable(Object variable) Check if this context or any of it's parent contexts contain this variable
void	getFlattenedContextMap(Map values) Helper Methods
Object	getGlobalValue(String variable)
List<Object>	getLocalValues()
VariableContext	getParentContext() Get the parent context for this variable context.
Object	getValue(Object variable) Get the value for the given variable, if the variable exits in the current context just return the value of the variable else lookup the parent context and return the value of the variable.
Map<Object,Object>	getVariableMap()
boolean	isEmpty() Check if the current context and its parents contain any variables
void	putAll(VariableContext other)
Object	remove(Object symbol)
void	setGlobalValue(String variable, Object value)
void	setParentContext(VariableContext parent) Set the parent variable context for this variable context, when looking up the variable's value, if the variable is not present in the current context, the parent context is lookedup.
Object	setValue(Object variable, Object value) Set the value for the given, if the variable already exits replaces its value with the given value else adds a new variable to the map.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

VariableContext

public VariableContext()

Constructor for VariableContext.

VariableContext

public VariableContext(boolean delegateSets)

Method Detail

setGlobalValue

public void setGlobalValue(String variable,
                           Object value)

getGlobalValue

public Object getGlobalValue(String variable)
                      throws TeiidComponentException

Throws:

TeiidComponentException

setValue

public Object setValue(Object variable,
                       Object value)

Set the value for the given, if the variable already exits replaces its value with the given value else adds a new variable to the map.

Parameters:

variable - The ElementSymbol to be added as a variable.

value - The value to be set for the given variable.

getValue

public Object getValue(Object variable)

Get the value for the given variable, if the variable exits in the current context just return the value of the variable else lookup the parent context and return the value of the variable.

Parameters:

variable - The ElementSymbol whose value needs to be returned.

Returns:

The value of the given variable

setParentContext

public void setParentContext(VariableContext parent)

Set the parent variable context for this variable context, when looking up the variable's value, if the variable is not present in the current context, the parent context is lookedup.

Parameters:

parent - The parent VariableContext.

getParentContext

public VariableContext getParentContext()

Get the parent context for this variable context. When looking up the variable's value, if the variable is not present in the current context, the parent context is lookedup.

Returns:

The parent VariableContext.

getFlattenedContextMap

public void getFlattenedContextMap(Map values)

Helper Methods

containsVariable

public boolean containsVariable(Object variable)

Check if this context or any of it's parent contexts contain this variable

Parameters:

variable - The variable which may be present on this context

Returns:

A boolean value indiating if the given variable is present on this context or any of it's parent contexts.

isEmpty

public boolean isEmpty()

Check if the current context and its parents contain any variables

Returns:

A boolean bollean value indicating if this context is empty

remove

public Object remove(Object symbol)

toString

public String toString()

Overrides:

toString in class Object

clear

public void clear()

putAll

public void putAll(VariableContext other)

getLocalValues

public List<Object> getLocalValues()

getVariableMap

public Map<Object,Object> getVariableMap()