Class AstNode

java.lang.Object

de.odysseus.el.tree.impl.ast.AstNode

All Implemented Interfaces:

ExpressionNode, Node

Direct Known Subclasses:

AstEval, AstIdentifier, AstMethod, AstProperty, AstRightValue, AstText

public abstract class AstNode
extends Object
implements ExpressionNode

Constructor Summary

Constructors

Constructor	Description
AstNode()

Method Summary

Modifier and Type	Method	Description
abstract void	appendStructure(StringBuilder builder, Bindings bindings)
abstract Object	eval(Bindings bindings, javax.el.ELContext context)
protected Method	findAccessibleMethod(Method method)
private static Method	findPublicAccessibleMethod(Method method)	Find accessible method.
final String	getStructuralId(Bindings bindings)	Get the canonical expression string for this node.
final Object	getValue(Bindings bindings, javax.el.ELContext context, Class<?> type)	evaluate and return the (optionally coerced) result.

Methods inherited from class Object

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

Methods inherited from interface ExpressionNode

getMethodInfo, getType, getValueReference, invoke, isLeftValue, isLiteralText, isMethodInvocation, isReadOnly, setValue

Methods inherited from interface Node

getCardinality, getChild

Constructor Details

AstNode

public AstNode()

Method Details

getValue

public final Object getValue(Bindings bindings,
 javax.el.ELContext context,
 Class<?> type)

evaluate and return the (optionally coerced) result.

Specified by:

getValue in interface ExpressionNode

Parameters:

bindings - bindings containing variables and functions

context - evaluation context

type - result type

Returns:

evaluated node, coerced to the expected type

appendStructure

public abstract void appendStructure(StringBuilder builder,
 Bindings bindings)

eval

public abstract Object eval(Bindings bindings,
 javax.el.ELContext context)

getStructuralId

public final String getStructuralId(Bindings bindings)

Description copied from interface: ExpressionNode

Get the canonical expression string for this node. Variable and funtion names will be replaced in a way such that two expression nodes that have the same node structure and bindings will also answer the same value here.

For example, "${foo:bar()+2*foobar}" may lead to "${<fn>() + 2 * <var>}" if foobar is a bound variable. Otherwise, the structural id would be "${<fn>() + 2 * foobar}".

If the bindings is null, the full canonical subexpression is returned.

Specified by:

getStructuralId in interface ExpressionNode

findPublicAccessibleMethod

private static Method findPublicAccessibleMethod(Method method)

Find accessible method. Searches the inheritance tree of the class declaring the method until it finds a method that can be invoked.

Parameters:

method - method

Returns:

accessible method or null

findAccessibleMethod

protected Method findAccessibleMethod(Method method)