1 files changed, 89 insertions, 0 deletions
diff --git a/bkucommon/src/main/java/at/gv/egiz/bku/binding/InputDecoderFactory.java b/bkucommon/src/main/java/at/gv/egiz/bku/binding/InputDecoderFactory.java
new file mode 100644
index 00000000..211deee7
--- /dev/null
+++ b/bkucommon/src/main/java/at/gv/egiz/bku/binding/InputDecoderFactory.java
@@ -0,0 +1,89 @@
+/*
+* Copyright 2008 Federal Chancellery Austria and
+* Graz University of Technology
+*
+* 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.egiz.bku.binding;
+
+import java.io.InputStream;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+/**
+ * Factory to get a matching instance for a encoded input stream when reading a http request.
+ *
+ */
+public class InputDecoderFactory {
+
+  public final static String MULTIPART_FORMDATA = "multipart/form-data";
+  public final static String URL_ENCODED = "application/x-www-form-urlencoded";
+
+  private static InputDecoderFactory instance = new InputDecoderFactory();
+  private static Log log = LogFactory.getLog(InputDecoderFactory.class);
+
+  private String defaultEncoding = URL_ENCODED;
+  private Map<String, Class<? extends InputDecoder>> decoderMap = new HashMap<String, Class<? extends InputDecoder>>();
+
+  private InputDecoderFactory() {
+    decoderMap.put(MULTIPART_FORMDATA, MultiPartFormDataInputDecoder.class);
+    decoderMap.put(URL_ENCODED, XWWWFormUrlInputDecoder.class);
+  }
+
+  public static InputDecoder getDefaultDecoder(InputStream is) {
+    return getDecoder(instance.defaultEncoding, is);
+  }
+
+  /**
+   * 
+   * @param contentType
+   * @param is
+   * @return null if the content type is not supported
+   */
+  public static InputDecoder getDecoder(String contentType, InputStream is) {
+    String prefix = contentType.split(";")[0].trim().toLowerCase();
+    Class<? extends InputDecoder> dec = instance.decoderMap.get(prefix);
+    if (dec == null) {
+      log.info("Unknown encoding prefix " + contentType);
+      return null;
+    }
+    InputDecoder id;
+    try {
+      id = dec.newInstance();
+      id.setContentType(contentType);
+      id.setInputStream(is);
+      return id;
+    } catch (InstantiationException e) {
+      log.error(e);
+      throw new IllegalArgumentException(
+          "Cannot get an input decoder for content type: " + contentType);
+    } catch (IllegalAccessException e) {
+      log.error(e);
+      throw new IllegalArgumentException(
+          "Cannot get an input decoder for content type: " + contentType);
+    }
+  }
+
+  /**
+   * Allows to register decoders for special mime types.
+   * @param mimeType
+   * @param decoder
+   */
+  public static void registerDecoder(String mimeType,
+      Class<? extends InputDecoder> decoder) {
+    instance.decoderMap.put(mimeType.toLowerCase(), decoder);
+  }
+}