org.activiti.engine.impl.juel

Class AstProperty

java.lang.Object

org.activiti.engine.impl.juel.AstNode

org.activiti.engine.impl.juel.AstProperty

All Implemented Interfaces:

ExpressionNode, Node

Direct Known Subclasses:

AstBracket, AstDot

public abstract class AstProperty
extends AstNode

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	lvalue
protected AstNode	prefix
protected boolean	strict

Constructor Summary

Constructors

Constructor and Description
AstProperty(AstNode prefix, boolean lvalue, boolean strict)

Method Summary

Methods

Modifier and Type	Method and Description
Object	eval(Bindings bindings, ELContext context)
protected Method	findMethod(String name, Class<?> clazz, Class<?> returnType, Class<?>[] paramTypes)
AstNode	getChild(int i) Get i'th child
MethodInfo	getMethodInfo(Bindings bindings, ELContext context, Class<?> returnType, Class<?>[] paramTypes) Get method information.
protected AstNode	getPrefix()
protected abstract Object	getProperty(Bindings bindings, ELContext context)
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	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.

Methods inherited from class org.activiti.engine.impl.juel.AstNode

appendStructure, getStructuralId, getValue

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.activiti.engine.impl.juel.Node

getCardinality

Field Detail

prefix

protected final AstNode prefix

lvalue

protected final boolean lvalue

strict

protected final boolean strict

Constructor Detail

AstProperty

public AstProperty(AstNode prefix,
           boolean lvalue,
           boolean strict)

Method Detail

getProperty

protected abstract Object getProperty(Bindings bindings,
                 ELContext context)
                               throws ELException

Throws:

ELException

getPrefix

protected AstNode getPrefix()

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

isLiteralText

public final boolean isLiteralText()

Returns:

true if this node represents literal text

isLeftValue

public final 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.

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

isReadOnly

public boolean isReadOnly(Bindings bindings,
                 ELContext context)
                   throws ELException

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

Throws:

ELException

setValue

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

Description copied from interface: ExpressionNode

Assign value.

Parameters:

bindings - bindings containing variables and functions

context - evaluation context

value - value to set

Throws:

ELException

findMethod

protected Method findMethod(String name,
                Class<?> clazz,
                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.

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

getChild

public AstNode getChild(int i)

Description copied from interface: Node

Get i'th child