Java tutorial
/** * MIT License * * Copyright (c) 2017 Wreulicke * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package com.github.wreulicke.bean.validation; import static com.github.wreulicke.bean.validation.ByteCodes.getByteCode; import java.io.IOException; import org.junit.Test; import org.objectweb.asm.ClassReader; import org.objectweb.asm.ClassWriter; import org.objectweb.asm.tree.ClassNode; public class ASMMethodParameterValidationInjectorTest { @Test public void firstCase() throws IOException { ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_FRAMES + ClassWriter.COMPUTE_MAXS); ClassReader reader = new ClassReader(getByteCode(Example.class)); ClassNode node = new ClassNode(); reader.accept(node, ClassReader.EXPAND_FRAMES); ASMMethodParameterValidationInjector injector = new ASMMethodParameterValidationInjector(); injector.inject(node); node.accept(writer); byte[] result = writer.toByteArray(); // ByteCodes.dumpAndDecomplie((p) -> p.resolve("Example.class"), getByteCode(Example.class)); } }