ptolemy.data.expr
Class XMLParser.EntityResolver

java.lang.Object
  ptolemy.data.expr.XMLParser.EntityResolver

All Implemented Interfaces:

org.xml.sax.EntityResolver

Enclosing class:

XMLParser

public static class XMLParser.EntityResolver
extends java.lang.Object
implements org.xml.sax.EntityResolver

The entity resolver that tries to first load a DTD file locally, and if it is not found, looks for it on the Internet using the DTD file's system ID. The DTD file, as well as its version, is uniquely identified by its public ID.

Since:

Ptolemy II 4.0

Version:

$Id: XMLParser.java 57040 2010-01-27 20:52:32Z cxh $

Author:

Thomas Feng

Accepted Rating:

Red (tfeng)

Proposed Rating:

Green (tfeng)

Field Summary

private static java.util.Hashtable

_localResources The string-to-string mapping between entities' publicId's and the names of the local files in which they are stored.

Constructor Summary

XMLParser.EntityResolver()

Method Summary

org.xml.sax.InputSource

resolveEntity(java.lang.String publicId, java.lang.String systemId) Resolve an entity (a DTD file) by first looking for it locally.

Methods inherited from class java.lang.Object

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

Field Detail

_localResources

private static final java.util.Hashtable _localResources

The string-to-string mapping between entities' publicId's and the names of the local files in which they are stored. The file names are relative to the path of the current class.

Constructor Detail

XMLParser.EntityResolver

public XMLParser.EntityResolver()

Method Detail

resolveEntity

public org.xml.sax.InputSource resolveEntity(java.lang.String publicId,
                                             java.lang.String systemId)

Resolve an entity (a DTD file) by first looking for it locally. If it is not found locally, this resolver tries to grab it from the Internet using its systemId.

Specified by:

resolveEntity in interface org.xml.sax.EntityResolver

Parameters:

publicId - The public ID of the entity, for example, "-//UC Berkeley//DTD MoML 1//EN" for Ptolemy MoML 1.0.

systemId - The system ID of the entity, for example, "http://ptolemy.eecs.berkeley.edu/xml/dtd/MoML_1.dtd".

Returns:

The input source that contains the content of the DTD, or null if it cannot be loaded either locally or from the Internet.