1 files changed, 64 insertions, 0 deletions
diff --git a/common/src/at/gv/egovernment/moa/util/StreamEntityResolver.java b/common/src/at/gv/egovernment/moa/util/StreamEntityResolver.java
new file mode 100644
index 000000000..38c4e863c
--- /dev/null
+++ b/common/src/at/gv/egovernment/moa/util/StreamEntityResolver.java
@@ -0,0 +1,64 @@
+package at.gv.egovernment.moa.util;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Map;
+
+import org.xml.sax.EntityResolver;
+import org.xml.sax.InputSource;
+import org.xml.sax.SAXException;
+
+/**
+ * An <code>EntityResolver</code> that maps system IDs to 
+ * <code>InputStream</code>s.
+ * 
+ * @author Patrick Peck
+ * @version $Id$
+ */
+public class StreamEntityResolver implements EntityResolver {
+  
+  /** A mapping from Public ID or System ID to an <code>InputStream</code>
+   * containing the entity. */
+  private Map mappedEntities;
+  
+  /**
+   * Create a <code>StreamEntityResolver</code>.
+   * 
+   * @param mappedEntities A mapping from public or system IDs 
+   * (<code>String</code> objects) to <code>InputStream</code>s. 
+   */
+  public StreamEntityResolver(Map mappedEntities) {
+    this.mappedEntities = mappedEntities;
+  }
+
+  /**
+   * Resolve an entity by looking it up in the mapped entities.
+   * 
+   * First, the public ID is looked up in the mapping, then the system ID.
+   * 
+   * @param publicId The public ID of the entity.
+   * @param systemId The system ID of the entity.
+   * @return An <code>InputStream</code> containing the entity or 
+   * <code>null</code> if no entity could be found. 
+   * @throws SAXException Signalling a parsing exception.
+   * @throws IOException Error reading the entity.
+   */
+  public InputSource resolveEntity(String publicId, String systemId) 
+    throws SAXException, IOException {
+      
+    InputSource src = null;
+      
+    if (publicId != null && mappedEntities.get(publicId) != null) {
+      src = new InputSource((InputStream) mappedEntities.get(publicId));
+    } else if (systemId != null && mappedEntities.get(systemId) != null) {
+      src = new InputSource((InputStream) mappedEntities.get(systemId));
+    }
+    
+    if (src != null) {
+      src.setPublicId(publicId);
+      src.setSystemId(systemId);
+    }
+    
+    return src;
+  }
+}