WKStatisticsPlugin/buildSrc/src/main/groovy/com/gradle/ares/AresTransform.groovy

package com.gradle.ares

import com.gradle.JarZipUtil
import com.gradle.ModifyClassTransform
import org.gradle.api.Project
import org.objectweb.asm.ClassReader
import org.objectweb.asm.ClassWriter

/**
 * Created by Glen on 2017/2/7.
 */

public class AresTransform extends ModifyClassTransform {
    public AresTransform(Project project) {
        super(project);
    }

    @Override
    String getName() {
        return "AresPlugin"
    }

    @Override
    protected void handleChangedFile(File input) {
        String path = input.absolutePath.replace("/", "\\")

        if (input.isFile()) {
            debug("changed:" + path)
            if (path.endsWith(".class")) {
                modifyClass(input)
            } else if (path.endsWith(".jar")) {
                boolean modify = false
                if (path.contains("exploded-aar") && !path.contains("exploded-aar\\com.android.support")) {
                    modify = true
                }

                if (modify) {
                    //需要处理的jar包
                    File tmp = new File(input.getParent() + File.separator + "tmp")
                    tmp.deleteOnExit()

                    JarZipUtil.unzipJar(input, tmp.absolutePath)
                    modify = false
                    tmp.eachFileRecurse { File file ->
                        if (file.isFile()) {
                            if (modifyClass(file)) {
                                modify = true
                            }
                        }
                    }
                    if (modify) JarZipUtil.zipJar(tmp.absolutePath, input)
                }
            }
        }
    }

    /**
     * 修改类文件
     * @param clazz
     * @return
     */
    private boolean modifyClass(File clazz) {
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS)
        ClassReader cr = new ClassReader(clazz.bytes)
        ClassAdapter adapter = new ClassAdapter(cw, project)
        cr.accept(adapter, ClassReader.SKIP_DEBUG)

        if (adapter.modify) {
            FileOutputStream out = new FileOutputStream(clazz)
            out.write(cw.toByteArray())
            out.close()
        }
        return adapter.modify
    }
}