com.bc.jexp.impl
Class ParserImpl

java.lang.Object
  com.bc.jexp.impl.ParserImpl

All Implemented Interfaces:

Parser

public final class ParserImpl
extends Object
implements Parser

A default implementation for the com.bc.jexp.Parser interface.

Version:

$Revision$ $Date$

Author:

Norman Fomferra (norman.fomferra@brockmann-consult.de)

Constructor Summary

ParserImpl()
Constructs a new parser instance which uses a DefaultNamespace and type-checking enabled.

ParserImpl(boolean typeChecking)
Constructs a new parser instance which uses a DefaultNamespace and the given type-checking setting.

ParserImpl(Namespace namespace)
Constructs a new parser instance which uses the given namespace and type-checking enabled.

ParserImpl(Namespace namespace, boolean typeChecking)
Constructs a new parser instance which uses the given namespace and the given type-checking setting.

Method Summary

Namespace	getDefaultNamespace() Gets this parser's default namespace.
boolean	isTypeChecking() Gets whether or not this parser performs type checking on expressions.
Term	parse(String code) Parses the expression given in the code string.
Term	parse(String code, Namespace namespace) Parses the expression given in the code string.

Methods inherited from class java.lang.Object

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

Constructor Detail

ParserImpl

public ParserImpl()

Constructs a new parser instance which uses a DefaultNamespace and type-checking enabled.

ParserImpl

public ParserImpl(boolean typeChecking)

Constructs a new parser instance which uses a DefaultNamespace and the given type-checking setting.

Parameters:

typeChecking - if true, the parser performs strong type-checking on expressions

ParserImpl

public ParserImpl(Namespace namespace)

Constructs a new parser instance which uses the given namespace and type-checking enabled.

Parameters:

namespace - the environment used to resolve names.

ParserImpl

public ParserImpl(Namespace namespace,
                  boolean typeChecking)

Constructs a new parser instance which uses the given namespace and the given type-checking setting.

Parameters:

namespace - the environment used to resolve names.

typeChecking - if true, the parser performs type checking on expressions

Method Detail

getDefaultNamespace

public final Namespace getDefaultNamespace()

Gets this parser's default namespace.

Specified by:

getDefaultNamespace in interface Parser

Returns:

the default environment used to resolve names.

isTypeChecking

public boolean isTypeChecking()

Gets whether or not this parser performs type checking on expressions.

Returns:

if true, the parser performs type checking on expressions

parse

public final Term parse(String code)
                 throws ParseException

Parses the expression given in the code string. Names in the code string are resolved using the default namespace.

Specified by:

parse in interface Parser

Parameters:

code - the code string, for the syntax of valid expressions refer to the class description

Throws:

ParseException - if a parse reportError occurs

parse

public final Term parse(String code,
                        Namespace namespace)
                 throws ParseException

Parses the expression given in the code string. Names in the code string are resolved using the given namespace.

Specified by:

parse in interface Parser

Parameters:

code - the code string, for the syntax of valid expressions refer to the class description

namespace - the environment which is used to resolve names

Throws:

ParseException - if a parse error occurs