1 files changed, 85 insertions, 0 deletions
diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/impl/input/CompoundPdfDataSourceImpl.java b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/impl/input/CompoundPdfDataSourceImpl.java
new file mode 100644
index 0000000..f5e9b76
--- /dev/null
+++ b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/impl/input/CompoundPdfDataSourceImpl.java
@@ -0,0 +1,85 @@
+/**
+ * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
+ * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
+ * joint initiative of the Federal Chancellery Austria and Graz University of
+ * Technology.
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://www.osor.eu/eupl/
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ *
+ * This product combines work with different licenses. See the "NOTICE" text
+ * file for details on the various modules and licenses.
+ * The "NOTICE" text file is part of the distribution. Any derivative works
+ * that you distribute must include a readable copy of the "NOTICE" text file.
+ */
+package at.gv.egiz.pdfas.impl.input;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.io.SequenceInputStream;
+
+import at.gv.egiz.pdfas.framework.input.DataSource;
+import at.gv.egiz.pdfas.framework.input.PdfDataSource;
+
+/**
+ * @author wprinz
+ *
+ */
+public class CompoundPdfDataSourceImpl implements PdfDataSource
+{
+  protected DataSource originalDataSource = null;
+  
+  protected byte[] appendix = null;
+  
+  public CompoundPdfDataSourceImpl (PdfDataSource original, byte [] appendix)
+  {
+    this.originalDataSource = original;
+    this.appendix = appendix;
+  }
+
+  /**
+   * @see at.gv.egiz.pdfas.framework.input.DataSource#createInputStream()
+   */
+  public InputStream createInputStream()
+  {
+    ByteArrayInputStream bais = new ByteArrayInputStream(this.appendix);
+    SequenceInputStream sis = new SequenceInputStream(this.originalDataSource.createInputStream(), bais);
+    return sis;
+  }
+
+  /**
+   * @see at.gv.egiz.pdfas.framework.input.DataSource#getLength()
+   */
+  public int getLength()
+  {
+    return this.originalDataSource.getLength() + this.appendix.length;
+  }
+  
+  byte [] cache = null;
+
+  /**
+   * @see at.gv.egiz.pdfas.framework.input.DataSource#getAsByteArray()
+   */
+  public byte[] getAsByteArray()
+  {
+    if (cache != null)
+    {
+      return cache;
+    }
+    
+    cache = new byte [getLength()];
+    System.arraycopy(originalDataSource.getAsByteArray(), 0, cache, 0, originalDataSource.getLength());
+    System.arraycopy(appendix, 0, cache, originalDataSource.getLength(), appendix.length);
+    
+    return cache;
+  }
+}