java implementation of enry

Signed-off-by: Miguel Molina <miguel@erizocosmi.co>

java/Makefile

@@ -0,0 +1,61 @@
+JNAERATOR_VERSION=ac73c9e
+JARS_DIR=./lib
+JAR=$(JARS_DIR)/enry.jar
+JNAERATOR_DIR=./.jnaerator
+JNAERATOR_JAR=$(JNAERATOR_DIR)/jnaerator.jar
+RESOURCES_SRC=../.shared
+RESOURCES_DIR=./shared
+HEADER_FILE=$(RESOURCES_DIR)/libenry.h
+
+all: $(JAR)
+
+$(JAR): $(RESOURCES_DIR) $(JNAERATOR_JAR)
+	mkdir -p lib && \
+	java -jar $(JNAERATOR_JAR) \
+		-package tech.sourced.enry.nativelib \
+		-library enry \
+		$(HEADER_FILE) \
+		-o $(JARS_DIR) \
+		-mode StandaloneJar \
+		-runtime JNA;
+
+$(RESOURCES_DIR): os-shared-lib
+	cp -R $(RESOURCES_SRC) $(RESOURCES_DIR)
+
+$(JNAERATOR_JAR): $(RESOURCES_DIR)
+	git clone --depth 1 https://github.com/nativelibs4java/jnaerator.git $(JNAERATOR_DIR) && \
+	cd $(JNAERATOR_DIR) && \
+	git checkout $(JNAERATOR_VERSION) && \
+	mvn clean install && \
+	mv jnaerator/target/jnaerator-*-shaded.jar ./jnaerator.jar && \
+	cd ..;
+
+os-shared-lib:
+	@os_name="$(shell uname -s)" && \
+	if [ "$$os_name" == "Linux" ]; then \
+		$(MAKE) linux-shared; \
+	elif [ "$$os_name" == "Darwin" ]; then \
+		$(MAKE) darwin-shared; \
+	else \
+		echo "Unsupported operating system, can't build shared library"; \
+		exit 1; \
+	fi;
+
+linux-shared:
+	cd .. && \
+	$(MAKE) linux-shared
+
+darwin-shared:
+	cd .. && \
+	$(MAKE) darwin-shared
+
+test:
+	sbt clean test
+
+package:
+	sbt clean assembly
+
+clean:
+	rm -rf $(JAR)
+	rm -rf $(RESOURCES_DIR)
+