de.odysseus.el.tree.impl.ast
Class AstRightValue

java.lang.Object
  de.odysseus.el.tree.impl.ast.AstNode
      de.odysseus.el.tree.impl.ast.AstRightValue

All Implemented Interfaces:

ExpressionNode, Node

Direct Known Subclasses:

AstBinary, AstChoice, AstComposite, AstFunction, AstLiteral, AstMethod, AstNested, AstUnary

public abstract class AstRightValue
extends AstNode

Author:

Christoph Beck

Constructor Summary

AstRightValue()

Method Summary

MethodInfo	getMethodInfo(Bindings bindings, ELContext context, java.lang.Class returnType, java.lang.Class[] paramTypes) Get method information.
java.lang.Class<?>	getType(Bindings bindings, ELContext context) according to the spec, the result is undefined for rvalues, so answer null
java.lang.Object	invoke(Bindings bindings, ELContext context, java.lang.Class returnType, java.lang.Class[] paramTypes, java.lang.Object[] paramValues) Invoke method.
boolean	isLeftValue()
boolean	isLiteralText() Answer false
boolean	isReadOnly(Bindings bindings, ELContext context) non-lvalues are always readonly, so answer true
void	setValue(Bindings bindings, ELContext context, java.lang.Object value) non-lvalues are always readonly, so throw an exception

Methods inherited from class de.odysseus.el.tree.impl.ast.AstNode

appendStructure, eval, getStructuralId, getValue

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.odysseus.el.tree.Node

getCardinality, getChild

Constructor Detail

AstRightValue

public AstRightValue()

Method Detail

isLiteralText

public final boolean isLiteralText()

Answer false

Returns:

true if this node represents literal text

getType

public final java.lang.Class<?> getType(Bindings bindings,
                                        ELContext context)

according to the spec, the result is undefined for rvalues, so answer null

Parameters:

bindings - bindings containing variables and functions

context - evaluation context

Returns:

accepted type or null for non-lvalue nodes

isReadOnly

public final boolean isReadOnly(Bindings bindings,
                                ELContext context)

non-lvalues are always readonly, so answer true

Parameters:

bindings - bindings containing variables and functions

context - evaluation context

Returns:

true if this a read-only expression node

setValue

public final void setValue(Bindings bindings,
                           ELContext context,
                           java.lang.Object value)

non-lvalues are always readonly, so throw an exception

Parameters:

bindings - bindings containing variables and functions

context - evaluation context

value - value to set

getMethodInfo

public final MethodInfo getMethodInfo(Bindings bindings,
                                      ELContext context,
                                      java.lang.Class returnType,
                                      java.lang.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 final java.lang.Object invoke(Bindings bindings,
                                     ELContext context,
                                     java.lang.Class returnType,
                                     java.lang.Class[] paramTypes,
                                     java.lang.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

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 proefix).