iluwatar#4: Unzip an archive

Author: nikhilbarar

src/main/java/Library.java

@@ -34,6 +34,7 @@
 import java.util.*;
 import java.util.List;
 import java.util.zip.ZipEntry;
+import java.util.zip.ZipInputStream;
 import java.util.zip.ZipOutputStream;
 
 /*
@@ -312,4 +313,28 @@ public static int httpGet(URL address) throws IOException {
         HttpURLConnection con = (HttpURLConnection) address.openConnection();
         return con.getResponseCode();
     }
+    
+    /**
+     * UnZip an archive
+     * @param zipFilename the file name of the archived file
+     * @throws IOException
+     */
+    public static void unzipArchive(String zipFileName) throws IOException {
+		byte[] buffer = new byte[1024];
+		try (ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFileName))) {
+			ZipEntry zipEntry = zis.getNextEntry();
+			while (zipEntry != null) {
+				String fileName = zipEntry.getName();
+				File newFile = new File(fileName);
+				try (FileOutputStream fos = new FileOutputStream(newFile)) {
+					int len;
+					while ((len = zis.read(buffer)) > 0) {
+						fos.write(buffer, 0, len);
+					}
+				}
+				zipEntry = zis.getNextEntry();
+			}
+			zis.closeEntry();
+		}
+	}
 }

src/test/java/LibraryTest.java

@@ -278,4 +278,19 @@ public void testHttpGet() throws IOException {
         int responseCode = Library.httpGet(new URL("http://www.google.com"));
         assertEquals(200, responseCode);
     }
+    
+    /**
+     * Tests for {@link Library#unzipArchive(String)}
+     */
+    @Test
+    public void testUnzipArchive() throws IOException {
+        final String archivedFile = "src/test/resources/somearchivedfile.zip";
+        final String unarchivedFile = "somearchivedfile.txt";
+        try {
+            Library.unzipArchive(archivedFile);
+            assertTrue(Files.exists(Paths.get(unarchivedFile)));
+        } finally {
+            Files.deleteIfExists(new File(unarchivedFile).toPath());
+        }
+    }
 }