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.asm;
021    
022    import java.io.IOException;
023    import java.io.InputStream;
024    import java.util.HashMap;
025    import java.util.Map;
026    
027    import org.apache.commons.io.IOUtils;
028    import org.objectweb.asm.ClassReader;
029    import org.slf4j.Logger;
030    import org.slf4j.LoggerFactory;
031    
032    public class AsmClassProviderImpl extends AsmClassProvider {
033    
034      private static Logger logger = LoggerFactory.getLogger(AsmClassProviderImpl.class);
035      private final ClassLoader classLoader;
036      private Map<String, AsmClass> asmClassCache = new HashMap<String, AsmClass>();
037    
038      public AsmClassProviderImpl() {
039        this.classLoader = Thread.currentThread().getContextClassLoader();
040      }
041    
042      public AsmClassProviderImpl(ClassLoader classLoader) {
043        this.classLoader = classLoader;
044      }
045    
046      public AsmClass getClass(String internalName, DETAIL_LEVEL level) {
047        if (internalName == null) {
048          throw new IllegalStateException("You can try to load a class whose internalName = 'null'");
049        }
050        AsmClass asmClass = getAsmClassFromCacheOrCreateIt(internalName);
051        if (level.isGreaterThan(asmClass.getDetailLevel())) {
052          decoracteAsmClassFromBytecode(asmClass, level);
053        }
054        return asmClass;
055      }
056    
057      private AsmClass getAsmClassFromCacheOrCreateIt(String internalName) {
058        AsmClass asmClass = asmClassCache.get(internalName);
059        if (asmClass == null) {
060          asmClass = new AsmClass(internalName, DETAIL_LEVEL.NOTHING);
061          asmClassCache.put(internalName, asmClass);
062        }
063        return asmClass;
064      }
065    
066      private void decoracteAsmClassFromBytecode(AsmClass asmClass, DETAIL_LEVEL level) {
067        InputStream input = null;
068        try {
069          AsmClassVisitor classVisitor = new AsmClassVisitor(this, asmClass, level);
070          input = classLoader.getResourceAsStream(asmClass.getInternalName() + ".class");
071          ClassReader asmReader = new ClassReader(input);
072          asmReader.accept(classVisitor, 0);
073    
074        } catch (IOException e) {
075          logger.warn("Class '" + asmClass.getInternalName() + "' is not accessible through the ClassLoader.");
076        } catch (SecurityException e) {
077          logger.warn("Class '" + asmClass.getInternalName()
078              + "' is not accessible through the ClassLoader. One signed jar seems to be corrupted.");
079        } finally {
080          IOUtils.closeQuietly(input);
081        }
082      }
083    }