--- /dev/null
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE pkgmetadata SYSTEM 'http://www.gentoo.org/dtd/metadata.dtd'>
+<pkgmetadata>
+<maintainer type='person'>
+ <email>vapier@gentoo.org</email>
+</maintainer>
+<maintainer type='person'>
+ <email>tomboy64@sina.cn</email>
+</maintainer>
+<maintainer type='project'>
+ <email>java@gentoo.org</email>
+ <name>Gentoo Java Project</name>
+</maintainer>
+<maintainer type='project'>
+ <email>proxy-maint@gentoo.org</email>
+ <name>Gentoo Proxy Maintainers Project</name>
+</maintainer>
+<use>
+ <flag name="nano">Enable code generator and runtime library designed specifically for resource-constrained systems, like Android</flag>
+</use>
+<slots>
+ <subslots>soname major version number of protobuf</subslots>
+</slots>
+<upstream>
+ <remote-id type='github'>google/protobuf</remote-id>
+</upstream>
+</pkgmetadata>
--- /dev/null
+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI=6
+JAVA_PKG_IUSE="doc source"
+
+inherit java-pkg-2 java-pkg-simple
+
+MY_PV=${PV/_beta2/-beta-2}
+
+DESCRIPTION="Google's Protocol Buffers - official Java Bindings"
+HOMEPAGE="https://github.com/google/protobuf/ https://developers.google.com/protocol-buffers/"
+SRC_URI="https://github.com/google/protobuf/archive/v${MY_PV}.tar.gz -> protobuf-${PV}.tar.gz"
+
+LICENSE="Apache-2.0"
+SLOT="0/10"
+KEYWORDS="~amd64 ~arm ~arm64 ~mips ~ppc64 ~sh ~x86 ~amd64-linux ~arm-linux ~x86-linux ~x64-macos ~x86-macos"
+IUSE="nano"
+
+# Protobuf is only a build-time dep, but depend on the exact same version
+# (excluding revision), since we are using the same tarball.
+# But probably same subslot is sufficient.
+DEPEND=">=virtual/jdk-1.5
+ >=dev-libs/protobuf-3"
+RDEPEND=">=virtual/jre-1.5
+ !<dev-libs/protobuf-3[java(-)]"
+S="${WORKDIR}/protobuf-${MY_PV}"
+
+src_prepare() {
+ eapply_user
+ java-pkg-2_src_prepare
+}
+
+src_compile() {
+ pushd "${S}/java" >/dev/null || die
+ einfo "Compiling Java library ..."
+ /usr/bin/protoc --java_out=src/main/java -I../src ../src/google/protobuf/descriptor.proto || die
+ JAVA_SRC_DIR="${S}/java/src/main/java"
+ JAVA_JAR_FILENAME="protobuf.jar"
+ java-pkg-simple_src_compile
+ popd >/dev/null || die
+ if use nano; then
+ einfo "Compiling Java Nano library ..."
+ pushd "${S}/javanano" >/dev/null || die
+ /usr/bin/protoc --java_out=src/main/java -I../src ../src/google/protobuf/descriptor.proto || die
+ JAVA_SRC_DIR="${S}/javanano/src/main/java"
+ JAVA_GENTOO_CLASSPATH_EXTRA="${S}/java/src/main/java/"
+ JAVA_JAR_FILENAME="protobuf-nano.jar"
+ java-pkg-simple_src_compile
+ popd >/dev/null || die
+ fi
+}
+
+src_install() {
+ JAVA_JAR_FILENAME="${S}/java/protobuf.jar"
+ JAVA_SRC_DIR="${S}/java/src/main/java"
+ if use nano; then
+ JAVA_JAR_FILENAME="${JAVA_JAR_FILENAME} ${S}/javanano/protobuf-nano.jar"
+ JAVA_SRC_DIR="${JAVA_SRC_DIR} ${S}/javanano/src/main/java"
+ fi
+ mv "${S}/java/target" . || die
+ if use nano; then
+ cp -Rvf "${S}/javanano/target" . || die
+ fi
+ java-pkg-simple_src_install
+}