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