1 files changed, 79 insertions, 0 deletions
diff --git a/common/src/main/java/at/gv/egovernment/moa/util/StreamEntityResolver.java b/common/src/main/java/at/gv/egovernment/moa/util/StreamEntityResolver.java
new file mode 100644
index 000000000..6fd67e97a
--- /dev/null
+++ b/common/src/main/java/at/gv/egovernment/moa/util/StreamEntityResolver.java
@@ -0,0 +1,79 @@
+/*
+* Copyright 2003 Federal Chancellery Austria
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+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;
+  }
+}