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authorgregor <gregor@d688527b-c9ab-4aba-bd8d-4036d912da1d>2003-07-07 10:58:37 +0000
committergregor <gregor@d688527b-c9ab-4aba-bd8d-4036d912da1d>2003-07-07 10:58:37 +0000
commitece7d18cf35374bf4e26d041799cda8f791c89f8 (patch)
tree33707cb77627b65a2a4e7327a2e93fb7751c1b76 /common/src/at/gv/egovernment/moa/util/MOAEntityResolver.java
parent273aed93c03b18a6c6bb1af745ae46a13ad3c7f2 (diff)
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Initial commit
git-svn-id: https://joinup.ec.europa.eu/svn/moa-idspss/trunk@2 d688527b-c9ab-4aba-bd8d-4036d912da1d
Diffstat (limited to 'common/src/at/gv/egovernment/moa/util/MOAEntityResolver.java')
-rw-r--r--common/src/at/gv/egovernment/moa/util/MOAEntityResolver.java103
1 files changed, 103 insertions, 0 deletions
diff --git a/common/src/at/gv/egovernment/moa/util/MOAEntityResolver.java b/common/src/at/gv/egovernment/moa/util/MOAEntityResolver.java
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+++ b/common/src/at/gv/egovernment/moa/util/MOAEntityResolver.java
@@ -0,0 +1,103 @@
+package at.gv.egovernment.moa.util;
+
+import java.io.InputStream;
+
+import org.apache.xerces.util.URI;
+import org.apache.xerces.util.URI.MalformedURIException;
+import org.xml.sax.EntityResolver;
+import org.xml.sax.InputSource;
+
+import at.gv.egovernment.moa.logging.LogMsg;
+import at.gv.egovernment.moa.logging.Logger;
+
+/**
+ * An <code>EntityResolver</code> that looks up entities stored as
+ * local resources.
+ *
+ * <p>The following DTDs are mapped to local resources:
+ * <ul>
+ * <li>The XMLSchema.dtd</li>
+ * <li>The datatypes.dtd</li>
+ * </ul>
+ * </p>
+ * <p>For all other resources, an attempt is made to resolve them as resources,
+ * either absolute or relative to <code>Constants.SCHEMA_ROOT</code>.
+ *
+ * @author Patrick Peck
+ * @author Sven Aigner
+ */
+public class MOAEntityResolver implements EntityResolver {
+
+ /**
+ * Resolve an entity.
+ *
+ * The <code>systemId</code> parameter is used to perform the lookup of the
+ * entity as a resource, either by interpreting the <code>systemId</code> as
+ * an absolute resource path, or by appending the last path component of
+ * <code>systemId</code> to <code>Constants.SCHEMA_ROOT</code>.
+ *
+ * @param publicId The public ID of the resource.
+ * @param systemId The system ID of the resource.
+ * @return An <code>InputSource</code> from which the entity can be read, or
+ * <code>null</code>, 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
+ }
+} \ No newline at end of file