/*
* Copyright 2011 Henry Coles
*
* 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.pitest.coverage.execute;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
import org.pitest.bytecode.FrameOptions;
import org.pitest.classinfo.ComputeClassWriter;
import org.pitest.classpath.ClassloaderByteArraySource;
import org.pitest.coverage.CoverageClassVisitor;
import org.pitest.reflection.Reflection;
import org.pitest.util.IsolationUtils;
import org.pitest.util.StreamUtil;
import org.pitest.util.Unchecked;
import sun.pitest.CodeCoverageStore;
public final class JavassistCoverageInterceptor {
private static final Map<String, String> COMPUTE_CACHE = new ConcurrentHashMap<String, String>();
private JavassistCoverageInterceptor() {
}
public static InputStream openClassfile(final Object classPath, // NO_UCD
final String name) {
try {
if (isInstrumentedClass(name)) {
byte[] bs = getOriginalBytes(classPath, name);
return new ByteArrayInputStream(
transformBytes(IsolationUtils.getContextClassLoader(), name, bs));
} else {
return returnNormalBytes(classPath, name);
}
} catch (IOException ex) {
throw Unchecked.translateCheckedException(ex);
}
}
private static byte[] getOriginalBytes(final Object classPath,
final String name) throws IOException {
InputStream is = returnNormalBytes(classPath,name);
byte[] bs = StreamUtil.streamToByteArray(is);
is.close();
return bs;
}
private static byte[] transformBytes(final ClassLoader loader,
final String className, final byte[] classfileBuffer) {
final ClassReader reader = new ClassReader(classfileBuffer);
final ClassWriter writer = new ComputeClassWriter(
new ClassloaderByteArraySource(loader), COMPUTE_CACHE,
FrameOptions.pickFlags(classfileBuffer));
// The transformed classes will be given a different id than the one already loaded.
// Not clear if this is desirable or not. At the point of writing this comment
// pitest will merge coverage of all classes with the same fully qualified name.
// If this changes this might become a bug, however it would also probably not be possible
// to support powermock if this assumption changed, so this code would most likely be deleted.
final int id = CodeCoverageStore.registerClass(className);
reader.accept(new CoverageClassVisitor(id, writer),
ClassReader.EXPAND_FRAMES);
return writer.toByteArray();
}
private static InputStream returnNormalBytes(final Object classPath,
final String name) {
try {
return (InputStream) Reflection.publicMethod(classPath.getClass(),
"openClassfile").invoke(classPath, name);
} catch (final Exception e) {
throw Unchecked.translateCheckedException(e);
}
}
private static boolean isInstrumentedClass(final String name) {
return true;
}
}