org.apache.jdo.impl.jdoql.scope
Class VariableTable

java.lang.Object
  org.apache.jdo.impl.jdoql.scope.AbstractValueTable
      org.apache.jdo.impl.jdoql.scope.VariableTable

All Implemented Interfaces:

java.lang.Cloneable, java.io.Serializable, ValueTable

public class VariableTable

extends AbstractValueTable

The variable table.

Version:

0.1

Author:

Michael Bouschen

See Also:

Serialized Form

Field Summary

(package private) java.util.Map	declMap Map of declarations.
protected static org.apache.jdo.util.I18NHelper	msg I18N support
(package private) java.util.Map	valueMap Map of values.

Constructor Summary

VariableTable()

Method Summary

protected void	checkDeclaredIdentifier(java.lang.String name, Declaration decl) Internal method to check whether the specified identifier is declared.
void	declare(Declaration decl) Adds a new declaration.
VariableTable	getCopy() Returns a copy of this VariableTable.
java.lang.Object	getValue(java.lang.String name) Returns the current value for the specified identifier.
void	initValueHandling() This method initializes the map of values for this ValueTable.
boolean	isCompatibleValue(java.lang.String name, java.lang.Object value) Checks whether the type of the specified value is compatible of the type of the identifier from its declaration.
void	setValue(java.lang.String name, java.lang.Object value) Sets the value for the specified identifier.

Methods inherited from class java.lang.Object

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

Field Detail

declMap

java.util.Map declMap

Map of declarations. Key is the the name of the declared identifier, value is the Declaration node.

valueMap

transient java.util.Map valueMap

Map of values. This map includes a values entry for each declared identifier. Default value is UNDEFINED.

msg

protected static final org.apache.jdo.util.I18NHelper msg

I18N support

Constructor Detail

VariableTable

public VariableTable()

Method Detail

getCopy

public VariableTable getCopy()

Returns a copy of this VariableTable.

Returns:

a copy of this VariableTable.

checkDeclaredIdentifier

protected void checkDeclaredIdentifier(java.lang.String name,
                                       Declaration decl)

Internal method to check whether the specified identifier is declared.

Specified by:

checkDeclaredIdentifier in class AbstractValueTable

declare

public void declare(Declaration decl)

Adds a new declaration. The value is set to UNDEFINED.

Specified by:

declare in interface ValueTable

Parameters:

decl - the declaration node

initValueHandling

public void initValueHandling()

This method initializes the map of values for this ValueTable. It needs to be called prior to any use of an AbstractValueTable at query execution time.

setValue

public void setValue(java.lang.String name,
                     java.lang.Object value)

Sets the value for the specified identifier.

Specified by:

setValue in interface ValueTable

Parameters:

name - the name of the identifier

value - the current value of the identifier

getValue

public java.lang.Object getValue(java.lang.String name)

Returns the current value for the specified identifier.

Specified by:

getValue in interface ValueTable

Parameters:

name - the name of the identifier

Returns:

the current value of the identifier

isCompatibleValue

public boolean isCompatibleValue(java.lang.String name,
                                 java.lang.Object value)

Checks whether the type of the specified value is compatible of the type of the identifier from its declaration.

Specified by:

isCompatibleValue in interface ValueTable

Parameters:

name - the name of the identifier

value - the value to be checked

Returns:

true if the type of the value is compatible with the type of the identifier; false otherwise.