Initial commit

git-svn-id: https://joinup.ec.europa.eu/svn/moa-idspss/trunk@2 d688527b-c9ab-4aba-bd8d-4036d912da1d

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
new file mode 100644
index 000000000..9406612e2
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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
+  }
+}
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