Package com.sun.el.lang

Class ExpressionBuilder

java.lang.Object

com.sun.el.lang.ExpressionBuilder

All Implemented Interfaces:

NodeVisitor

public final class ExpressionBuilder
extends Object
implements NodeVisitor

Version:

$Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	ExpressionBuilder.NodeSoftReference
private static class	ExpressionBuilder.SoftConcurrentHashMap

Field Summary

Fields

Modifier and Type	Field	Description
private static final ExpressionBuilder.SoftConcurrentHashMap	cache
private String	expression
private FunctionMapper	fnMapper
private VariableMapper	varMapper

Constructor Summary

Constructors

Constructor	Description
ExpressionBuilder(String expression, ELContext ctx)

Method Summary

Modifier and Type	Method	Description
private Node	build()
MethodExpression	createMethodExpression(Class expectedReturnType, Class[] expectedParamTypes)
static Node	createNode(String expr)
private static Node	createNodeInternal(String expr)
ValueExpression	createValueExpression(Class expectedType)
private void	prepare(Node node)	Scan the expression nodes and captures the functions and variables used in this expression.
void	visit(Node node)

Methods inherited from class java.lang.Object

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

Field Details

cache

private static final ExpressionBuilder.SoftConcurrentHashMap cache

fnMapper

private FunctionMapper fnMapper

varMapper

private VariableMapper varMapper

expression

private String expression

Constructor Details

ExpressionBuilder

public ExpressionBuilder(String expression,
 ELContext ctx)
                  throws ELException

Throws:

ELException

Method Details

createNode

public static Node createNode(String expr)
                       throws ELException

Throws:

ELException

createNodeInternal

private static Node createNodeInternal(String expr)
                                throws ELException

Throws:

ELException

prepare

private void prepare(Node node)
              throws ELException

Scan the expression nodes and captures the functions and variables used in this expression. This ensures that any changes to the functions or variables mappings during the expression will not affect the evaluation of this expression, as the functions and variables are bound and resolved at parse time, as specified in the spec.

Throws:

ELException

build

private Node build()
            throws ELException

Throws:

ELException

visit

public void visit(Node node)
           throws ELException

Specified by:

visit in interface NodeVisitor

Throws:

ELException

createValueExpression

public ValueExpression createValueExpression(Class expectedType)
                                      throws ELException

Throws:

ELException

createMethodExpression

public MethodExpression createMethodExpression(Class expectedReturnType,
 Class[] expectedParamTypes)
                                        throws ELException

Throws:

ELException