package org.apache.cassandra; /* * * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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. * */ import org.junit.Ignore; import org.junit.runners.model.FrameworkMethod; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.LineNumberReader; import java.lang.reflect.Method; import java.util.Comparator; public class MethodComparator<T> implements Comparator<T> { private static final char[] METHOD_SEPARATORS = {1, 7}; private MethodComparator() { } public static MethodComparator<FrameworkMethod> getFrameworkMethodComparatorForJUnit4() { return new MethodComparator<FrameworkMethod>(); } @Override public int compare(T o1, T o2) { final MethodPosition methodPosition1 = this.getIndexOfMethodPosition(o1); final MethodPosition methodPosition2 = this.getIndexOfMethodPosition(o2); return methodPosition1.compareTo(methodPosition2); } private MethodPosition getIndexOfMethodPosition(final Object method) { if (method instanceof FrameworkMethod) { return this.getIndexOfMethodPosition((FrameworkMethod) method); } else if (method instanceof Method) { return this.getIndexOfMethodPosition((Method) method); } else { return new NullMethodPosition(); } } private MethodPosition getIndexOfMethodPosition(final FrameworkMethod frameworkMethod) { return getIndexOfMethodPosition(frameworkMethod.getMethod()); } private MethodPosition getIndexOfMethodPosition(final Method method) { final Class aClass = method.getDeclaringClass(); if (method.getAnnotation(Ignore.class) == null) { return getIndexOfMethodPosition(aClass, method.getName()); } else { return new NullMethodPosition(); } } private MethodPosition getIndexOfMethodPosition(final Class aClass, final String methodName) { MethodPosition methodPosition; for (final char methodSeparator : METHOD_SEPARATORS) { methodPosition = getIndexOfMethodPosition(aClass, methodName, methodSeparator); if (!(methodPosition instanceof NullMethodPosition)) { return methodPosition; } } return new NullMethodPosition(); } private MethodPosition getIndexOfMethodPosition(final Class aClass, final String methodName, final char methodSeparator) { final InputStream inputStream = aClass.getResourceAsStream(aClass.getSimpleName() + ".class"); final LineNumberReader lineNumberReader = new LineNumberReader(new InputStreamReader(inputStream)); final String methodNameWithSeparator = methodName + methodSeparator; try { try { String line; while ((line = lineNumberReader.readLine()) != null) { if (line.contains(methodNameWithSeparator)) { return new MethodPosition(lineNumberReader.getLineNumber(), line.indexOf(methodNameWithSeparator)); } } } finally { lineNumberReader.close(); } } catch (IOException e) { return new NullMethodPosition(); } return new NullMethodPosition(); } private static class MethodPosition implements Comparable<MethodPosition> { private final Integer lineNumber; private final Integer indexInLine; public MethodPosition(int lineNumber, int indexInLine) { this.lineNumber = lineNumber; this.indexInLine = indexInLine; } @Override public int compareTo(MethodPosition o) { // If line numbers are equal, then compare by indexes in this line. if (this.lineNumber.equals(o.lineNumber)) { return this.indexInLine.compareTo(o.indexInLine); } else { return this.lineNumber.compareTo(o.lineNumber); } } } private static class NullMethodPosition extends MethodPosition { public NullMethodPosition() { super(-1, -1); } } }