org.springframework.expression.spel
Class ExpressionState

java.lang.Object
  extended by org.springframework.expression.spel.ExpressionState

public class ExpressionState
extends Object

An ExpressionState is for maintaining per-expression-evaluation state, any changes to it are not seen by other expressions but it gives a place to hold local variables and for component expressions in a compound expression to communicate state. This is in contrast to the EvaluationContext, which is shared amongst expression evaluations, and any changes to it will be seen by other expressions or any code that chooses to ask questions of the context.

It also acts as a place for to define common utility routines that the various Ast nodes might need.

Since:
3.0
Author:
Andy Clement

Constructor Summary
ExpressionState(EvaluationContext context)
           
ExpressionState(EvaluationContext context, int configuration)
           
 
Method Summary
 boolean configuredToDynamicallyCreateNullObjects()
           
 boolean configuredToGrowCollection()
           
 Object convertValue(Object value, TypeDescriptor targetTypeDescriptor)
           
 Object convertValue(TypedValue value, TypeDescriptor targetTypeDescriptor)
           
 void enterScope(Map<String,Object> argMap)
           
 void enterScope(String name, Object value)
           
 void exitScope()
           
 Class<?> findType(String type)
           
 TypedValue getActiveContextObject()
          The active context object is what unqualified references to properties/etc are resolved against.
 EvaluationContext getEvaluationContext()
           
 List<PropertyAccessor> getPropertyAccessors()
           
 TypedValue getRootContextObject()
           
 TypeComparator getTypeComparator()
           
 Object lookupLocalVariable(String name)
           
 TypedValue lookupVariable(String name)
           
 TypedValue operate(Operation op, Object left, Object right)
           
 void popActiveContextObject()
           
 void pushActiveContextObject(TypedValue obj)
           
 void setLocalVariable(String name, Object value)
           
 void setVariable(String name, Object value)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ExpressionState

public ExpressionState(EvaluationContext context)

ExpressionState

public ExpressionState(EvaluationContext context,
                       int configuration)
Method Detail

getActiveContextObject

public TypedValue getActiveContextObject()
The active context object is what unqualified references to properties/etc are resolved against.


pushActiveContextObject

public void pushActiveContextObject(TypedValue obj)

popActiveContextObject

public void popActiveContextObject()

getRootContextObject

public TypedValue getRootContextObject()

setVariable

public void setVariable(String name,
                        Object value)

lookupVariable

public TypedValue lookupVariable(String name)

getTypeComparator

public TypeComparator getTypeComparator()

findType

public Class<?> findType(String type)
                  throws EvaluationException
Throws:
EvaluationException

convertValue

public Object convertValue(Object value,
                           TypeDescriptor targetTypeDescriptor)
                    throws EvaluationException
Throws:
EvaluationException

convertValue

public Object convertValue(TypedValue value,
                           TypeDescriptor targetTypeDescriptor)
                    throws EvaluationException
Throws:
EvaluationException

enterScope

public void enterScope(Map<String,Object> argMap)

enterScope

public void enterScope(String name,
                       Object value)

exitScope

public void exitScope()

setLocalVariable

public void setLocalVariable(String name,
                             Object value)

lookupLocalVariable

public Object lookupLocalVariable(String name)

operate

public TypedValue operate(Operation op,
                          Object left,
                          Object right)
                   throws EvaluationException
Throws:
EvaluationException

getPropertyAccessors

public List<PropertyAccessor> getPropertyAccessors()

getEvaluationContext

public EvaluationContext getEvaluationContext()

configuredToGrowCollection

public boolean configuredToGrowCollection()

configuredToDynamicallyCreateNullObjects

public boolean configuredToDynamicallyCreateNullObjects()