79 lines
2.8 KiB
Plaintext
79 lines
2.8 KiB
Plaintext
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package org.apache.commons.bcel6.util;
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import static org.junit.Assert.*;
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import java.io.BufferedInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.InputStream;
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import java.io.OutputStream;
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import org.apache.commons.bcel6.classfile.JavaClass;
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import org.junit.Test;
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public class BCELifierTestCase {
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@Test
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public void test() throws Exception {
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OutputStream os = new ByteArrayOutputStream();
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JavaClass java_class = BCELifier.getJavaClass("Java8Example");
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assertNotNull(java_class);
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BCELifier bcelifier = new BCELifier(java_class, os);
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bcelifier.start();
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}
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/*
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* Dump a class using "javap" and compare with the same class recreated
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* using BCELifier, "javac", "java" and dumped with "javap"
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* TODO: detect if JDK present and skip test if not
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*/
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@Test
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@org.junit.Ignore // does not work properly on some systems. Also the output is rather different
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public void testJavapCompare() throws Exception {
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testClassOnPath("target/test-classes/Java8Example.class");
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}
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private void testClassOnPath(String javaClass) throws Exception {
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// Get javap of the input class
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final String initial = exec(null, "javap", "-p", "-c", javaClass);
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final File workDir = new File("target");
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File infile = new File(javaClass);
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JavaClass java_class = BCELifier.getJavaClass(infile.getName().replace(".class", ""));
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assertNotNull(java_class);
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File outfile = new File(workDir,infile.getName().replace(".class", "Creator.java"));
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FileOutputStream fos = new FileOutputStream(outfile);
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BCELifier bcelifier = new BCELifier(java_class, fos);
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bcelifier.start();
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fos.close();
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exec(workDir, "javac", "-cp", "classes", outfile.getName());
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exec(workDir, "java", "-cp", ".:classes", outfile.getName().replace(".java", ""));
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final String output = exec(workDir, "javap", "-p", "-c", infile.getName());
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assertEquals(initial, output);
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}
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private String exec(File workDir, String ... args) throws Exception {
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// System.err.println(java.util.Arrays.toString(args));
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ProcessBuilder pb = new ProcessBuilder( args );
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pb.directory(workDir);
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Process proc = pb.start();
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BufferedInputStream is = new BufferedInputStream(proc.getInputStream());
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InputStream es = proc.getErrorStream();
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proc.waitFor();
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byte []buff=new byte[2048];
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int len;
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while((len=es.read(buff)) != -1) {
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System.err.print(new String(buff,0,len));
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}
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StringBuilder sb = new StringBuilder();
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while((len=is.read(buff)) != -1) {
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sb.append(new String(buff,0,len));
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}
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is.close();
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return sb.toString();
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}
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}
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