Package org.camunda.bpm.engine.impl.juel

Class AstEval

java.lang.Object

org.camunda.bpm.engine.impl.juel.AstNode

org.camunda.bpm.engine.impl.juel.AstEval

All Implemented Interfaces:

ExpressionNode, Node

public final class AstEval
extends AstNode

Constructor Summary

Constructors

Constructor	Description
AstEval(AstNode child, boolean deferred)

Method Summary

Modifier and Type	Method	Description
void	appendStructure(StringBuilder b, Bindings bindings)
Object	eval(Bindings bindings, ELContext context)
int	getCardinality()	Get the node's number of children.
AstNode	getChild(int i)	Get i'th child
MethodInfo	getMethodInfo(Bindings bindings, ELContext context, Class<?> returnType, Class<?>[] paramTypes)	Get method information.
Class<?>	getType(Bindings bindings, ELContext context)	Get the value type accepted in ExpressionNode.setValue(Bindings, ELContext, Object).
ValueReference	getValueReference(Bindings bindings, ELContext context)	Get value reference.
Object	invoke(Bindings bindings, ELContext context, Class<?> returnType, Class<?>[] paramTypes, Object[] paramValues)	Invoke method.
boolean	isDeferred()
boolean	isLeftValue()
boolean	isLiteralText()
boolean	isMethodInvocation()
boolean	isReadOnly(Bindings bindings, ELContext context)	Determine whether ExpressionNode.setValue(Bindings, ELContext, Object) will throw a PropertyNotWritableException.
void	setValue(Bindings bindings, ELContext context, Object value)	Assign value.
String	toString()

Methods inherited from class org.camunda.bpm.engine.impl.juel.AstNode

getStructuralId, getValue

Methods inherited from class java.lang.Object

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

Constructor Detail

AstEval

public AstEval(AstNode child,
               boolean deferred)

Method Detail

isDeferred

public boolean isDeferred()

isLeftValue

public boolean isLeftValue()

Returns:

true if the subtree rooted at this node could be used as an lvalue expression (identifier or property sequence with non-literal prefix).

isMethodInvocation

public boolean isMethodInvocation()

Returns:

true if the subtree rooted at this node is a method invocation.

getValueReference

public ValueReference getValueReference(Bindings bindings,
                                        ELContext context)

Description copied from interface: ExpressionNode

Get value reference.

Returns:

value reference

eval

public Object eval(Bindings bindings,
                   ELContext context)

Specified by:

eval in class AstNode

toString

public String toString()

Overrides:

toString in class Object

appendStructure

public void appendStructure(StringBuilder b,
                            Bindings bindings)

Specified by:

appendStructure in class AstNode

getMethodInfo

public MethodInfo getMethodInfo(Bindings bindings,
                                ELContext context,
                                Class<?> returnType,
                                Class<?>[] paramTypes)

Description copied from interface: ExpressionNode

Get method information. If this is a non-lvalue node, answer null.

Parameters:

bindings - bindings containing variables and functions

context - evaluation context

returnType - expected method return type (may be null meaning don't care)

paramTypes - expected method argument types

Returns:

method information or null

invoke

public Object invoke(Bindings bindings,
                     ELContext context,
                     Class<?> returnType,
                     Class<?>[] paramTypes,
                     Object[] paramValues)

Description copied from interface: ExpressionNode

Invoke method.

Parameters:

bindings - bindings containing variables and functions

context - evaluation context

returnType - expected method return type (may be null meaning don't care)

paramTypes - expected method argument types

paramValues - parameter values

Returns:

result of the method invocation

getType

public Class<?> getType(Bindings bindings,
                        ELContext context)

Description copied from interface: ExpressionNode

Get the value type accepted in ExpressionNode.setValue(Bindings, ELContext, Object).

Parameters:

bindings - bindings containing variables and functions

context - evaluation context

Returns:

accepted type or null for non-lvalue nodes

isLiteralText

public boolean isLiteralText()

Returns:

true if this node represents literal text

isReadOnly

public boolean isReadOnly(Bindings bindings,
                          ELContext context)

Description copied from interface: ExpressionNode

Determine whether ExpressionNode.setValue(Bindings, ELContext, Object) will throw a PropertyNotWritableException.

Parameters:

bindings - bindings containing variables and functions

context - evaluation context

Returns:

true if this a read-only expression node

setValue

public void setValue(Bindings bindings,
                     ELContext context,
                     Object value)

Description copied from interface: ExpressionNode

Assign value.

Parameters:

bindings - bindings containing variables and functions

context - evaluation context

value - value to set

getCardinality

public int getCardinality()

Description copied from interface: Node

Get the node's number of children.

getChild

public AstNode getChild(int i)

Description copied from interface: Node

Get i'th child