From 9b75bda9eabab609dfce6bccc27d61a35dcb86f1 Mon Sep 17 00:00:00 2001
From: Shibly Meeran <git@shib.me>
Date: Tue, 15 Jan 2019 20:19:48 +0530
Subject: [PATCH] adding zip util to selectively unzip files

---
 README.md                                     |  2 +-
 pom.xml                                       | 15 +------
 src/me/shib/java/lib/utils/FileUtils.java     | 44 +++++++++++++++++++
 .../shib/java/lib/utils/LocalFileCache.java   |  2 +-
 4 files changed, 47 insertions(+), 16 deletions(-)

diff --git a/README.md b/README.md
index f02ea08..01472ae 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,6 @@ Add to your `pom.xml`
 <dependency>
 	<groupId>me.shib.java.lib</groupId>
 	<artifactId>utils</artifactId>
-	<version>0.0.1</version>
+	<version>0.0.2</version>
 </dependency>
 ```
diff --git a/pom.xml b/pom.xml
index 9fb58d3..ed273a7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
 
     <groupId>me.shib.java.lib</groupId>
     <artifactId>utils</artifactId>
-    <version>0.0.1</version>
+    <version>0.0.2</version>
     <name>Utils</name>
     <description>Commonly used custom utils</description>
     <url>https://github.com/shibme/utils</url>
@@ -75,19 +75,6 @@
                     </archive>
                 </configuration>
             </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-javadoc-plugin</artifactId>
-                <version>2.10.4</version>
-                <executions>
-                    <execution>
-                        <id>attach-javadocs</id>
-                        <goals>
-                            <goal>jar</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-source-plugin</artifactId>
diff --git a/src/me/shib/java/lib/utils/FileUtils.java b/src/me/shib/java/lib/utils/FileUtils.java
index 799c1e7..a1adf42 100644
--- a/src/me/shib/java/lib/utils/FileUtils.java
+++ b/src/me/shib/java/lib/utils/FileUtils.java
@@ -4,6 +4,8 @@
 import java.math.BigInteger;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 
@@ -43,6 +45,48 @@ public static boolean unZip(File zipFile, File outputDirectory) {
         }
     }
 
+    public static boolean unZip(File zipFile, String fileToExtract, File outputDirectory) {
+        List<String> filesToExtract = new ArrayList<>();
+        filesToExtract.add(fileToExtract);
+        return unZip(zipFile, filesToExtract, outputDirectory);
+    }
+
+    public static boolean unZip(File zipFile, List<String> filesToExtract, File outputDirectory) {
+        byte[] buffer = new byte[1024];
+        try {
+            if (!outputDirectory.exists()) {
+                outputDirectory.mkdir();
+            }
+            ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFile));
+            ZipEntry ze = zis.getNextEntry();
+            while (ze != null) {
+                String fileName = ze.getName();
+                File newFile = new File(outputDirectory.getAbsolutePath() + File.separator + fileName);
+                if (filesToExtract.contains(newFile.getName())) {
+                    System.out.println("Extracting : " + newFile.getAbsoluteFile());
+                    if (ze.isDirectory()) {
+                        newFile.mkdirs();
+                    } else {
+                        new File(newFile.getParent()).mkdirs();
+                        FileOutputStream fos = new FileOutputStream(newFile);
+                        int len;
+                        while ((len = zis.read(buffer)) > 0) {
+                            fos.write(buffer, 0, len);
+                        }
+                        fos.close();
+                    }
+                }
+                ze = zis.getNextEntry();
+            }
+            zis.closeEntry();
+            zis.close();
+            System.out.println("Extracted " + zipFile.getName() + " successfully!");
+            return true;
+        } catch (IOException ex) {
+            return false;
+        }
+    }
+
     private static String calculateChecksum(File file, String hashType) {
         InputStream is = null;
         try {
diff --git a/src/me/shib/java/lib/utils/LocalFileCache.java b/src/me/shib/java/lib/utils/LocalFileCache.java
index d88f3e2..4b255df 100644
--- a/src/me/shib/java/lib/utils/LocalFileCache.java
+++ b/src/me/shib/java/lib/utils/LocalFileCache.java
@@ -104,7 +104,7 @@ public String[] getKeys(String type) {
         if (keyDir.exists()) {
             String[] encodedKeys = keyDir.list();
             ArrayList<String> keyList = new ArrayList<>();
-            if(encodedKeys != null) {
+            if (encodedKeys != null) {
                 for (String enKey : encodedKeys) {
                     String key = decodeKeyToName(enKey.replace(".json", ""));
                     if (key != null) {