1 files changed, 31 insertions, 0 deletions
diff --git a/BKUCommonGUI/src/main/java/at/gv/egiz/stal/impl/ByteArrayHashDataInput.java b/BKUCommonGUI/src/main/java/at/gv/egiz/stal/impl/ByteArrayHashDataInput.java
index b0285345..2b5ee7e7 100644
--- a/BKUCommonGUI/src/main/java/at/gv/egiz/stal/impl/ByteArrayHashDataInput.java
+++ b/BKUCommonGUI/src/main/java/at/gv/egiz/stal/impl/ByteArrayHashDataInput.java
@@ -7,7 +7,11 @@ package at.gv.egiz.stal.impl;
 
 import at.gv.egiz.stal.HashDataInput;
 import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
 import java.io.InputStream;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 
 /**
  *
@@ -15,6 +19,8 @@ import java.io.InputStream;
  */
 public class ByteArrayHashDataInput implements HashDataInput {
 
+    private static final Log log = LogFactory.getLog(ByteArrayHashDataInput.class);
+  
     protected byte[] hashData;
     protected String id;
     protected String mimeType;
@@ -30,6 +36,31 @@ public class ByteArrayHashDataInput implements HashDataInput {
         this.encoding = encoding;
     }
     
+    /**
+     * caches the hashdata input's stream
+     * @param hdi to be cached
+     */
+    public ByteArrayHashDataInput(HashDataInput hdi) {
+      if (hdi == null) {
+        throw new NullPointerException("HashDataInput not provided.");
+      }
+      InputStream is = hdi.getHashDataInput();
+      ByteArrayOutputStream baos = new ByteArrayOutputStream();
+      try {
+        byte[] buffer = new byte[1024];
+        for (int i = is.read(buffer); i > -1; i = is.read(buffer)) {
+          baos.write(buffer, 0, i);
+        }
+        this.hashData = baos.toByteArray();
+      } catch (IOException ex) {
+        log.error("Failed to cache provided HashDataInput: " + ex.getMessage(), ex);
+        this.hashData = new byte[0];
+      }
+      this.id = hdi.getReferenceId();
+      this.mimeType = hdi.getMimeType();
+      this.encoding = hdi.getEncoding();
+    }
+    
     @Override
     public String getReferenceId() {
         return id;