## ApiSummarizer

An early version of ApiSummarizer.

It analyzes java source code / jars and outputs a JSON representation of the public API.

It's currently used in JNIgen to get the information of the Java API.

## Build

When using it via JNIgen, the `jnigen:setup` script will take care of building the jar in appropriate location.

To build the jar manually, run `gradlew(.bat) buildFatJar` in project root. The jar will be created in `build/libs`
directory.

## Command line

```
usage: java -jar <JAR> [-s <SOURCE_DIR=.>] [-c <CLASSES_JAR>]
<CLASS_OR_PACKAGE_NAMES>
Class or package names should be fully qualified.

-b,--backend <arg>        backend to use for summary generation ('doclet'
or 'asm').
-c,--classes <arg>        paths to search for compiled classes
-D,--doctool-args <arg>   Arguments to pass to the documentation tool
-M,--use-modules          use Java modules
-m,--module-names <arg>   comma separated list of module names
-r,--recursive            Include dependencies of classes
-s,--sources <arg>        paths to search for source files
-v,--verbose              Enable verbose output
```

Here class or package names are specified as fully qualified names, for example `org.apache.pdfbox.pdmodel.PDDocument` will load `org/apache/pdfbox/pdmodel/PDDocument.java`. It assumes the package naming reflects directory structure. If such mapping results in a directory, for example `android.os` is given and a directory `android/os` is found under the source path, it is considered as a package and all Java source files under that directory are loaded recursively.

Note that some options are directly forwarded to the underlying tool.

ApiSummarizer's current use is in JNIgen for obtaining public API of java packages. Only the features strictly required for that purpose are focused upon.

## Running tests

Run `gradlew(.bat) test`

There are not many tests at the moment. We plan to add some later.

## ASM backend

The main backend is based on javadoc API and generates summary based on java sources. A more experimental ASM backend also exists, and works somewhat okay-ish. It can summarize the compiled JARs. However, compiled jars without debug information do not include method parameter names. Some basic renaming is applied, i.e If type is `Object`, the parameter name will be output as `object` if an actual name is absent.

## TODO

See issue #23.