org.activiti.engine.impl.juel

Class AstIdentifier

java.lang.Object

org.activiti.engine.impl.juel.AstNode

org.activiti.engine.impl.juel.AstIdentifier

All Implemented Interfaces:

ExpressionNode, IdentifierNode, Node

public class AstIdentifier
extends AstNode
implements IdentifierNode

Constructor Summary

Constructors

Constructor and Description
AstIdentifier(String name, int index)

Method Summary

Methods

Modifier and Type	Method and 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
int	getIndex() Get the unique index of this identifier in the expression (e.g.
protected Method	getMethod(Bindings bindings, ELContext context, Class<?> returnType, Class<?>[] paramTypes)
MethodInfo	getMethodInfo(Bindings bindings, ELContext context, Class<?> returnType, Class<?>[] paramTypes) Get method information.
String	getName() Get the identifier name
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[] params) Invoke method.
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.activiti.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

AstIdentifier

public AstIdentifier(String name,
             int index)

Method Detail

getType

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

Description copied from interface: ExpressionNode

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

Specified by:

getType in interface ExpressionNode

Parameters:

bindings - bindings containing variables and functions

context - evaluation context

Returns:

accepted type or null for non-lvalue nodes

isLeftValue

public boolean isLeftValue()

Specified by:

isLeftValue in interface ExpressionNode

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()

Specified by:

isMethodInvocation in interface ExpressionNode

Returns:

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

isLiteralText

public boolean isLiteralText()

Specified by:

isLiteralText in interface ExpressionNode

Returns:

true if this node represents literal text

getValueReference

public ValueReference getValueReference(Bindings bindings,
                               ELContext context)

Description copied from interface: ExpressionNode

Get value reference.

Specified by:

getValueReference in interface ExpressionNode

Returns:

value reference

eval

public Object eval(Bindings bindings,
          ELContext context)

Specified by:

eval in class AstNode

setValue

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

Description copied from interface: ExpressionNode

Assign value.

Specified by:

setValue in interface ExpressionNode

Parameters:

bindings - bindings containing variables and functions

context - evaluation context

value - value to set

isReadOnly

public boolean isReadOnly(Bindings bindings,
                 ELContext context)

Description copied from interface: ExpressionNode

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

Specified by:

isReadOnly in interface ExpressionNode

Parameters:

bindings - bindings containing variables and functions

context - evaluation context

Returns:

true if this a read-only expression node

getMethod

protected Method getMethod(Bindings bindings,
               ELContext context,
               Class<?> returnType,
               Class<?>[] paramTypes)

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.

Specified by:

getMethodInfo in interface ExpressionNode

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[] params)

Description copied from interface: ExpressionNode

Invoke method.

Specified by:

invoke in interface ExpressionNode

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

params - parameter values

Returns:

result of the method invocation

toString

public String toString()

Overrides:

toString in class Object

appendStructure

public void appendStructure(StringBuilder b,
                   Bindings bindings)

Specified by:

appendStructure in class AstNode

getIndex

public int getIndex()

Description copied from interface: IdentifierNode

Get the unique index of this identifier in the expression (e.g. preorder index)

Specified by:

getIndex in interface IdentifierNode

getName

public String getName()

Description copied from interface: IdentifierNode

Get the identifier name

Specified by:

getName in interface IdentifierNode

getCardinality

public int getCardinality()

Description copied from interface: Node

Get the node's number of children.

Specified by:

getCardinality in interface Node

getChild

public AstNode getChild(int i)

Description copied from interface: Node

Get i'th child

Specified by:

getChild in interface Node