1 files changed, 15 insertions, 0 deletions
diff --git a/src/main/java/org/zwobble/mammoth/internal/docx/DocxFile.java b/src/main/java/org/zwobble/mammoth/internal/docx/DocxFile.java
new file mode 100644
index 0000000..8e73a04
--- /dev/null
+++ b/src/main/java/org/zwobble/mammoth/internal/docx/DocxFile.java
@@ -0,0 +1,15 @@
+package org.zwobble.mammoth.internal.docx;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Optional;
+
+public interface DocxFile extends Closeable {
+    static InputStream getInputStream(DocxFile file, String name) throws IOException {
+        return file.tryGetInputStream(name)
+            .orElseThrow(() -> new IOException("Missing entry in file: " + name));
+    }
+
+    Optional<InputStream> tryGetInputStream(String name) throws IOException;
+}