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/*******************************************************************************
* Copyright (c) 2009, 2016 Mountainminds GmbH & Co. KG and Contributors
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.internal.instr;
import org.jacoco.core.internal.data.CRC64;
import org.jacoco.core.internal.flow.ClassProbesAdapter;
import org.jacoco.core.runtime.IExecutionDataAccessorGenerator;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.Opcodes;
/**
* Factory to find a suitable strategy to access the probe array for a given
* class.
*/
public final class ProbeArrayStrategyFactory {
private ProbeArrayStrategyFactory() {
}
/**
* Creates a suitable strategy instance for the class described by the given
* reader.
*
* @param reader
* reader to get information about the class
* @param accessorGenerator
* accessor to the coverage runtime
* @return strategy instance
*/
public static IProbeArrayStrategy createFor(final ClassReader reader,
final IExecutionDataAccessorGenerator accessorGenerator) {
final String className = reader.getClassName();
final int version = getVersion(reader);
final long classId = CRC64.checksum(reader.b);
final boolean withFrames = version >= Opcodes.V1_6;
if (isInterface(reader)) {
final ProbeCounter counter = getProbeCounter(reader);
if (counter.getCount() == 0) {
return new NoneProbeArrayStrategy();
}
if (version >= Opcodes.V1_8 && counter.hasMethods()) {
return new FieldProbeArrayStrategy(className, classId,
withFrames, InstrSupport.DATAFIELD_INTF_ACC,
accessorGenerator);
} else {
return new LocalProbeArrayStrategy(className, classId,
counter.getCount(), accessorGenerator);
}
} else {
return new FieldProbeArrayStrategy(className, classId, withFrames,
InstrSupport.DATAFIELD_ACC, accessorGenerator);
}
}
private static boolean isInterface(final ClassReader reader) {
return (reader.getAccess() & Opcodes.ACC_INTERFACE) != 0;
}
private static int getVersion(final ClassReader reader) {
return reader.readShort(6);
}
private static ProbeCounter getProbeCounter(final ClassReader reader) {
final ProbeCounter counter = new ProbeCounter();
reader.accept(new ClassProbesAdapter(counter, false), 0);
return counter;
}
}
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