Refactor Java API (#806)

sherpa-onnx/java-api/Makefile

@@ -0,0 +1,42 @@
+
+# all .class and .jar files are put inside out_dir
+out_dir := build
+out_jar := $(out_dir)/sherpa-onnx.jar
+
+package_dir := com/k2fsa/sherpa/onnx
+
+java_files := WaveReader.java
+java_files += EndpointRule.java
+java_files += EndpointConfig.java
+java_files += FeatureConfig.java
+java_files += OnlineLMConfig.java
+java_files += OnlineParaformerModelConfig.java
+java_files += OnlineZipformer2CtcModelConfig.java
+java_files += OnlineTransducerModelConfig.java
+java_files += OnlineModelConfig.java
+java_files += OnlineStream.java
+java_files += OnlineRecognizerConfig.java
+java_files += OnlineRecognizerResult.java
+java_files += OnlineRecognizer.java
+
+class_files := $(java_files:%.java=%.class)
+
+java_files := $(addprefix src/$(package_dir)/,$(java_files))
+class_files := $(addprefix $(out_dir)/$(package_dir)/,$(class_files))
+
+$(info -- java files $(java_files))
+$(info --)
+$(info -- class files $(class_files))
+
+.phony: all clean
+
+all: $(out_jar)
+
+$(out_jar): $(class_files)
+	jar --create --verbose --file $(out_jar) -C $(out_dir) .
+
+clean:
+	$(RM) -rfv $(out_dir)
+
+$(class_files): $(out_dir)/$(package_dir)/%.class: src/$(package_dir)/%.java
+	javac -d $(out_dir) --class-path $(out_dir) $<