1 files changed, 35 insertions, 0 deletions
diff --git a/src/main/java/at/gv/egiz/pdfas/framework/input/DataSource.java b/src/main/java/at/gv/egiz/pdfas/framework/input/DataSource.java
new file mode 100644
index 0000000..265cb0c
--- /dev/null
+++ b/src/main/java/at/gv/egiz/pdfas/framework/input/DataSource.java
@@ -0,0 +1,35 @@
+/**
+ * 
+ */
+package at.gv.egiz.pdfas.framework.input;
+
+import java.io.InputStream;
+
+/**
+ * The input document data source.
+ * 
+ * <p>
+ * Usually this is a PdfDataSource, but it may be a TextDataSource as well.
+ * </p>
+ * 
+ * @author wprinz
+ * 
+ */
+public interface DataSource
+{
+  /**
+   * Creates a new InputStream that allows to read out the document's binary
+   * data from the beginning.
+   * 
+   * @return Returns the InputStream with the binary data.
+   */
+  public InputStream createInputStream();
+
+  /**
+   * Returns the length (number of bytes) of the stream.
+   * 
+   * @return Returns the length (number of bytes) of the stream.
+   */
+  public int getLength();
+
+}