de.odysseus.el.tree.impl
Class Builder

java.lang.Object
  de.odysseus.el.tree.impl.Builder

All Implemented Interfaces:

TreeBuilder, java.io.Serializable

public class Builder
extends java.lang.Object
implements TreeBuilder

Tree builder.

Author:

Christoph Beck

See Also:

Serialized Form

Nested Class Summary

static class

Builder.Feature Feature enumeration type.

Constructor Summary

Builder()

Builder(Builder.Feature... features)

Method Summary

Tree	build(java.lang.String expression) Parse expression.
boolean	equals(java.lang.Object obj)
int	hashCode()
boolean	isEnabled(Builder.Feature feature)
static void	main(java.lang.String[] args) Dump out abstract syntax tree for a given expression
protected java.lang.Number	parseFloat(java.lang.String string) Parse a floating point literal.
protected java.lang.Number	parseInteger(java.lang.String string) Parse an integer literal.

Methods inherited from class java.lang.Object

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

Constructor Detail

Builder

public Builder()

Builder

public Builder(Builder.Feature... features)

Method Detail

parseInteger

protected java.lang.Number parseInteger(java.lang.String string)
                                 throws java.lang.NumberFormatException

Parse an integer literal.

Parameters:

string - string to parse

Returns:

Long.valueOf(string)

Throws:

java.lang.NumberFormatException

parseFloat

protected java.lang.Number parseFloat(java.lang.String string)
                               throws java.lang.NumberFormatException

Parse a floating point literal.

Parameters:

string - string to parse

Returns:

Double.valueOf(string)

Throws:

java.lang.NumberFormatException

isEnabled

public boolean isEnabled(Builder.Feature feature)

Returns:

true iff the specified feature is supported.

build

public Tree build(java.lang.String expression)
           throws ELException

Parse expression.

Specified by:

build in interface TreeBuilder

Parameters:

expression - expression string

Returns:

tree corresponding to the given expression

Throws:

ELException - on parse error

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

main

public static void main(java.lang.String[] args)

Dump out abstract syntax tree for a given expression

Parameters:

args - array with one element, containing the expression string