org.jetbrains.android.anko.ClassProcessor.kt Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of anko-generator Show documentation
The generator module from Anko.
The newest version!
/*
 * Copyright 2016 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jetbrains.android.anko

import org.jetbrains.android.anko.artifact.Artifact
import org.jetbrains.android.anko.utils.ClassTree
import org.objectweb.asm.ClassReader
import org.objectweb.asm.tree.ClassNode
import java.io.File
import java.io.InputStream
import java.util.zip.ZipFile

class ClassProcessor(val artifact: Artifact) {
    fun genClassTree(): ClassTree {
        val classTree = ClassTree()
        for (classData in extractClasses()) {
            classTree.add(processClassData(classData.first), classData.second)
        }
        return classTree
    }

    private fun extractClasses(): Sequence> {
        return artifact.jars.asSequence().flatMap { getEntries(it) }.map { it to false }
    }

    private fun getEntries(file: File): Sequence {
        if (file.extension == "jar") {
            val zipFile = ZipFile(file)
            return zipFile.entries().asSequence()
                .filter { it.name.endsWith(".class") }
                .map { zipFile.getInputStream(it) }
        }

        assert(file.extension == "aar")

        val zipFile = ZipFile(file)
        return zipFile.entries().asSequence()
            .filter { it.name.endsWith(".jar") }
            .map {
                File.createTempFile("anko", ".jar").apply {
                    deleteOnExit()
                    zipFile.getInputStream(it).copyTo(outputStream())
                }
            }.flatMap { getEntries(it) }
    }

    private fun processClassData(classData: InputStream): ClassNode {
        return classData.use {
            val classNode = ClassNode()
            val classReader = ClassReader(classData)
            classReader.accept(classNode, 0)
            classNode
        }
    }
}