Add test for FileMagic

JavaDoc warning fixes
Remove some IDE warnings
Reformat code of sample application

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1847437 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 80 insertions, 0 deletions

diff --git a/src/testcases/org/apache/poi/poifs/filesystem/TestFileMagic.java b/src/testcases/org/apache/poi/poifs/filesystem/TestFileMagic.java
new file mode 100644
index 0000000000..6587547b95
--- /dev/null
+++ b/src/testcases/org/apache/poi/poifs/filesystem/TestFileMagic.java
@@ -0,0 +1,80 @@
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You 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 org.apache.poi.poifs.filesystem;
+
+import org.apache.poi.POIDataSamples;
+import org.junit.Test;
+
+import java.io.BufferedInputStream;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+import static org.junit.Assert.*;
+
+public class TestFileMagic {
+    @Test
+    public void testFileMagic() {
+        assertEquals(FileMagic.XML, FileMagic.valueOf("XML"));
+        assertEquals(FileMagic.XML, FileMagic.valueOf("<?xml".getBytes()));
+
+        assertEquals(FileMagic.HTML, FileMagic.valueOf("HTML"));
+        assertEquals(FileMagic.HTML, FileMagic.valueOf("<!DOCTYP".getBytes()));
+        assertEquals(FileMagic.HTML, FileMagic.valueOf("<!DOCTYPE".getBytes()));
+        assertEquals(FileMagic.HTML, FileMagic.valueOf("<html".getBytes()));
+
+        try {
+            FileMagic.valueOf("some string");
+            fail("Should catch exception here");
+        } catch (IllegalArgumentException e) {
+            // expected here
+        }
+    }
+
+    @Test
+    public void testFileMagicFile() throws IOException {
+        assertEquals(FileMagic.OLE2, FileMagic.valueOf(POIDataSamples.getSpreadSheetInstance().getFile("SampleSS.xls")));
+        assertEquals(FileMagic.OOXML, FileMagic.valueOf(POIDataSamples.getSpreadSheetInstance().getFile("SampleSS.xlsx")));
+    }
+
+    @Test
+    public void testFileMagicStream() throws IOException {
+        try (InputStream stream = new BufferedInputStream(new FileInputStream(POIDataSamples.getSpreadSheetInstance().getFile("SampleSS.xls")))) {
+            assertEquals(FileMagic.OLE2, FileMagic.valueOf(stream));
+        }
+        try (InputStream stream = new BufferedInputStream(new FileInputStream(POIDataSamples.getSpreadSheetInstance().getFile("SampleSS.xlsx")))) {
+            assertEquals(FileMagic.OOXML, FileMagic.valueOf(stream));
+        }
+    }
+
+    @Test
+    public void testPrepare() throws IOException {
+        try (InputStream stream = new BufferedInputStream(new FileInputStream(POIDataSamples.getSpreadSheetInstance().getFile("SampleSS.xlsx")))) {
+            assertSame(stream, FileMagic.prepareToCheckMagic(stream));
+        }
+
+        try (InputStream stream = new InputStream() {
+            @Override
+            public int read() {
+                return 0;
+            }
+        }) {
+            assertNotSame(stream, FileMagic.prepareToCheckMagic(stream));
+        }
+    }
+}