001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2008-2012 SonarSource
004     * mailto:contact AT sonarsource DOT com
005     *
006     * Sonar is free software; you can redistribute it and/or
007     * modify it under the terms of the GNU Lesser General Public
008     * License as published by the Free Software Foundation; either
009     * version 3 of the License, or (at your option) any later version.
010     *
011     * Sonar is distributed in the hope that it will be useful,
012     * but WITHOUT ANY WARRANTY; without even the implied warranty of
013     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014     * Lesser General Public License for more details.
015     *
016     * You should have received a copy of the GNU Lesser General Public
017     * License along with Sonar; if not, write to the Free Software
018     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
019     */
020    package org.sonar.java.bytecode.visitor;
021    
022    import java.util.HashSet;
023    import java.util.Set;
024    
025    import org.sonar.java.bytecode.asm.AsmClass;
026    import org.sonar.java.bytecode.asm.AsmEdge;
027    import org.sonar.java.bytecode.asm.AsmMethod;
028    import org.sonar.squid.api.SourceCodeEdgeUsage;
029    import org.sonar.squid.measures.Metric;
030    
031    public class RFCVisitor extends BytecodeVisitor {
032    
033      private AsmClass asmClass;
034      private Set<AsmMethod> distinctCallToExternalMethods;
035      private int rfc = 0;
036    
037      public void visitClass(AsmClass asmClass) {
038        rfc = 0;
039        this.asmClass = asmClass;
040        distinctCallToExternalMethods = new HashSet<AsmMethod>();
041      }
042    
043      public void visitMethod(AsmMethod asmMethod) {
044        if (asmMethod.isBodyLoaded() && !asmMethod.isAccessor()) {
045          rfc++;
046        }
047      }
048    
049      public void visitEdge(AsmEdge edge) {
050        if (edge.getTargetAsmClass() != asmClass && edge.getUsage() == SourceCodeEdgeUsage.CALLS_METHOD
051            && !((AsmMethod) edge.getTo()).isAccessor()) {
052          distinctCallToExternalMethods.add((AsmMethod) edge.getTo());
053        }
054      }
055    
056      public void leaveClass(AsmClass asmClass) {
057        rfc += distinctCallToExternalMethods.size();
058        getSourceClass(asmClass).add(Metric.RFC, rfc);
059    
060        if (isMainPublicClassInFile(asmClass)) {
061          getSourceFile(asmClass).add(Metric.RFC, rfc);
062        }
063      }
064    }