From bee5dd259a4438d45ecd1bcc26dfba12875236d6 Mon Sep 17 00:00:00 2001
From: Thomas Lenz <thomas.lenz@egiz.gv.at>
Date: Tue, 26 Jun 2018 11:03:48 +0200
Subject: initial commit

---
 .../core/impl/utils/EAAFDomEntityResolver.java     | 104 +++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 eaaf_core/src/main/java/at/gv/egiz/eaaf/core/impl/utils/EAAFDomEntityResolver.java

(limited to 'eaaf_core/src/main/java/at/gv/egiz/eaaf/core/impl/utils/EAAFDomEntityResolver.java')

diff --git a/eaaf_core/src/main/java/at/gv/egiz/eaaf/core/impl/utils/EAAFDomEntityResolver.java b/eaaf_core/src/main/java/at/gv/egiz/eaaf/core/impl/utils/EAAFDomEntityResolver.java
new file mode 100644
index 00000000..5b39386c
--- /dev/null
+++ b/eaaf_core/src/main/java/at/gv/egiz/eaaf/core/impl/utils/EAAFDomEntityResolver.java
@@ -0,0 +1,104 @@
+/*******************************************************************************
+ *******************************************************************************/
+
+
+package at.gv.egiz.eaaf.core.impl.utils;
+
+import java.io.InputStream;
+
+import org.apache.xerces.util.URI;
+import org.apache.xerces.util.URI.MalformedURIException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.xml.sax.EntityResolver;
+import org.xml.sax.InputSource;
+
+import at.gv.egiz.eaaf.core.api.data.XMLNamespaceConstants;
+
+/**
+ * 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>.
+ * 
+ */
+public class EAAFDomEntityResolver implements EntityResolver {
+	private static final Logger log = LoggerFactory.getLogger(EAAFDomEntityResolver.class);
+	
+  /**
+   * 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 (publicId != null) {
+      // check if we can resolve some standard dtd's
+      if (publicId.equalsIgnoreCase("-//W3C//DTD XMLSchema 200102//EN")) {
+        return new InputSource(
+          getClass().getResourceAsStream(
+            XMLNamespaceConstants.SCHEMA_ROOT + "XMLSchema.dtd"));
+      } else if (publicId.equalsIgnoreCase("datatypes")) {
+        return new InputSource(
+          getClass().getResourceAsStream(
+        	XMLNamespaceConstants.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(XMLNamespaceConstants.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
-- 
cgit v1.2.3