add ant javadoc to generate javadoc to include in releases

Author: eighthave

custom_rules.xml

@@ -15,7 +15,28 @@
     </exec>
   </target>
 
-  <target name="-post-build" depends="-getgitdetails">
+  <target name="-javadoc" description="Generate Javadocs">
+    <property name="javadoc.jar.name" value="${out.dir}/sqlcipher-javadoc.jar" />
+    <javadoc sourcepath="${source.dir}"
+             destdir="${out.dir}/javadoc"
+             packagenames="net.sqlcipher.*"
+             windowtitle="SQLCipher for Android"
+             doctitle="SQLCipher for Android" />
+    <delete file="${javadoc.jar.name}"/>
+    <jar destfile="${javadoc.jar.name}"
+         includes="net/sqlcipher/**"
+         basedir="${out.dir}/javadoc">
+      <manifest>
+        <attribute name="Implementation-Vendor" value="Zetetic"/>
+        <attribute name="Implementation-Title" value="SQLCipher for Android"/>
+        <attribute name="Implementation-URL" value="https://www.zetetic.net/sqlcipher/open-source"/>
+        <attribute name="Implementation-Version" value="${git.describe}"/>
+        <attribute name="Git-Revision" value="${git.revision}"/>
+      </manifest>
+    </jar>
+  </target>
+
+  <target name="-post-build" depends="-getgitdetails,-javadoc">
     <property name="jar.dir" value="libs" />
     <property name="jar.name" value="${jar.dir}/sqlcipher.jar" />
     <property file="${sdk.dir}/tools/source.properties" />
@@ -38,6 +59,7 @@
         <attribute name="Android-NDK-Release" value="${ndk.release}"/>
       </manifest>
     </jar>
+    <copy file="${out.dir}/sqlcipher-javadoc.jar" todir="${jar.dir}" preservelastmodified="true" overwrite="true"/>
   </target>
 
 </project>