001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2009 SonarSource SA
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.indexer.SquidIndex;
030    import org.sonar.squid.measures.Metric;
031    
032    public class RFCVisitor extends BytecodeVisitor {
033    
034      private AsmClass asmClass;
035      private Set<AsmMethod> distinctCallToExternalMethods;
036      private int rfc = 0;
037    
038      public RFCVisitor(SquidIndex index) {
039        super(index);
040      }
041    
042      public void visitClass(AsmClass asmClass) {
043        rfc = 0;
044        this.asmClass = asmClass;
045        distinctCallToExternalMethods = new HashSet<AsmMethod>();
046      }
047    
048      public void visitMethod(AsmMethod asmMethod) {
049        if (asmMethod.isBodyLoaded() && !asmMethod.isAccessor()) {
050          rfc++;
051        }
052      }
053    
054      public void visitEdge(AsmEdge edge) {
055        if (edge.getTargetAsmClass() != asmClass && edge.getUsage() == SourceCodeEdgeUsage.CALLS_METHOD
056            && !((AsmMethod) edge.getTo()).isAccessor()) {
057          distinctCallToExternalMethods.add((AsmMethod) edge.getTo());
058        }
059      }
060    
061      public void leaveClass(AsmClass asmClass) {
062        rfc += distinctCallToExternalMethods.size();
063        getSourceClass(asmClass).add(Metric.RFC, rfc);
064    
065        if (isMainPublicClassInFile(asmClass)) {
066          getSourceFile(asmClass).add(Metric.RFC, rfc);
067        }
068      }
069    }