From 43e57a42832ea8b4ceb0317f3c9028a4174ffa7b Mon Sep 17 00:00:00 2001
From: mcentner The following DTDs are mapped to local resources:
+ * EntityResolver
that looks up entities stored as
+ * local resources.
+ *
+ *
+ *
+ *
For all other resources, an attempt is made to resolve them as resources,
+ * either absolute or relative to Constants.SCHEMA_ROOT
.
+ *
+ * @author Patrick Peck
+ * @author Sven Aigner
+ */
+public class MOAEntityResolver implements EntityResolver {
+
+ /**
+ * Resolve an entity.
+ *
+ * The systemId
parameter is used to perform the lookup of the
+ * entity as a resource, either by interpreting the systemId
as
+ * an absolute resource path, or by appending the last path component of
+ * systemId
to Constants.SCHEMA_ROOT
.
+ *
+ * @param publicId The public ID of the resource.
+ * @param systemId The system ID of the resource.
+ * @return An InputSource
from which the entity can be read, or
+ * null
, if the entity could not be found.
+ * @see org.xml.sax.EntityResolver#resolveEntity(java.lang.String, java.lang.String)
+ */
+ public InputSource resolveEntity(String publicId, String systemId) {
+ InputStream stream;
+ int slashPos;
+
+ if (Logger.isDebugEnabled()) {
+ Logger.debug(
+ new LogMsg("resolveEntity: p=" + publicId + " s=" + systemId));
+ }
+
+ if (publicId != null) {
+ // check if we can resolve some standard dtd's
+ if (publicId.equalsIgnoreCase("-//W3C//DTD XMLSchema 200102//EN")) {
+ return new InputSource(
+ getClass().getResourceAsStream(
+ Constants.SCHEMA_ROOT + "XMLSchema.dtd"));
+ } else if (publicId.equalsIgnoreCase("datatypes")) {
+ return new InputSource(
+ getClass().getResourceAsStream(
+ Constants.SCHEMA_ROOT + "datatypes.dtd"));
+ }
+ } else if (systemId != null) {
+ // get the URI path
+ try {
+ URI uri = new URI(systemId);
+ systemId = uri.getPath();
+ if (!"file".equals(uri.getScheme()) || "".equals(systemId.trim())) {
+ return null;
+ }
+ } catch (MalformedURIException e) {
+ return null;
+ }
+
+ // try to get the resource from the full path
+ stream = getClass().getResourceAsStream(systemId);
+ if (stream != null) {
+ InputSource source = new InputSource(stream);
+
+ source.setSystemId(systemId);
+ return source;
+ }
+
+ // try to get the resource from the last path component
+ slashPos = systemId.lastIndexOf('/');
+ if (slashPos >= 0 && systemId.length() > slashPos) {
+ systemId = systemId.substring(slashPos + 1, systemId.length());
+ stream =
+ getClass().getResourceAsStream(Constants.SCHEMA_ROOT + systemId);
+ if (stream != null) {
+ InputSource source = new InputSource(stream);
+
+ source.setSystemId(systemId);
+ return source;
+ }
+ }
+ }
+
+ return null; // nothing found - let the parser handle the entity
+ }
+}
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