1 files changed, 91 insertions, 0 deletions
diff --git a/BKUViewer/src/main/java/at/gv/egiz/bku/text/TextValidator.java b/BKUViewer/src/main/java/at/gv/egiz/bku/text/TextValidator.java
new file mode 100644
index 00000000..dee8ff2e
--- /dev/null
+++ b/BKUViewer/src/main/java/at/gv/egiz/bku/text/TextValidator.java
@@ -0,0 +1,91 @@
+/*
+* 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.text;
+
+import at.gv.egiz.bku.gui.viewer.FontProviderException;
+import at.gv.egiz.bku.viewer.ResourceFontLoader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.UnsupportedEncodingException;
+import java.nio.CharBuffer;
+import java.nio.charset.Charset;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import at.gv.egiz.bku.viewer.ValidationException;
+import at.gv.egiz.bku.viewer.Validator;
+import java.awt.Font;
+
+public class TextValidator implements Validator {
+
+  /**
+   * Logging facility.
+   */
+  protected static Log log = LogFactory.getLog(TextValidator.class);
+
+  protected Font viewerFont;
+
+  public TextValidator() throws FontProviderException {
+    viewerFont = new ResourceFontLoader().getFont();
+  }
+
+  private void invalid(char c) throws ValidationException {
+    log.info("Invalid character (0x" + Integer.toHexString(c) + ") found.");
+    // TODO: localize
+    throw new ValidationException();
+  }
+  
+  @Override
+  public void validate(InputStream is, String charset)
+      throws ValidationException {
+    
+    InputStreamReader reader;
+    if (charset != null) {
+      try {
+        reader = new InputStreamReader(is, charset);
+      } catch (UnsupportedEncodingException e) {
+        log.info("Charset '" + charset + "' not supported.", e);
+        // TODO: localize
+        throw new ValidationException(e);
+      }
+    } else {
+      reader = new InputStreamReader(is, Charset.forName("UTF-8"));
+    }
+    
+    try {
+      char c;
+      CharBuffer cb = CharBuffer.allocate(256);
+      for (int l; (l = reader.read(cb)) != -1;) {
+        cb.flip();
+        for (int i = 0; i < l; i++) {
+          c = cb.get();
+          if (!viewerFont.canDisplay(c)) invalid(c);
+        }
+      }
+      cb.clear();
+    } catch (IOException e) {
+      // TODO: localize
+      throw new ValidationException(e);
+    }
+    
+    
+    
+  }
+
+}