/*
* FindBugs - Find Bugs in Java programs
* Copyright (C) 2006, University of Maryland
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package edu.umd.cs.findbugs.classfile.engine.bcel;
import java.io.IOException;
import org.apache.bcel.Repository;
import org.apache.bcel.classfile.ClassParser;
import org.apache.bcel.classfile.JavaClass;
import edu.umd.cs.findbugs.AnalysisCacheToRepositoryAdapter;
import edu.umd.cs.findbugs.SystemProperties;
import edu.umd.cs.findbugs.classfile.CheckedAnalysisException;
import edu.umd.cs.findbugs.classfile.ClassDescriptor;
import edu.umd.cs.findbugs.classfile.IAnalysisCache;
import edu.umd.cs.findbugs.classfile.IClassAnalysisEngine;
import edu.umd.cs.findbugs.classfile.ResourceNotFoundException;
import edu.umd.cs.findbugs.classfile.analysis.ClassData;
/**
* Analysis engine to produce a BCEL JavaClass object for a named class.
*
* @author David Hovemeyer
*/
public class JavaClassAnalysisEngine implements IClassAnalysisEngine<JavaClass> {
private static final boolean DEBUG_MISSING_CLASSES = SystemProperties.getBoolean("findbugs.debug.missingclasses");
private static final String JVM_VERSION = SystemProperties.getProperty("java.runtime.version");
/*
* (non-Javadoc)
*
* @see
* edu.umd.cs.findbugs.classfile.IAnalysisEngine#analyze(edu.umd.cs.findbugs
* .classfile.IAnalysisCache, java.lang.Object)
*/
@Override
public JavaClass analyze(IAnalysisCache analysisCache, ClassDescriptor descriptor) throws CheckedAnalysisException {
try {
ClassData classData = analysisCache.getClassAnalysis(ClassData.class, descriptor);
JavaClass javaClass = new ClassParser(classData.getInputStream(), descriptor.toResourceName()).parse();
// Make sure that the JavaClass object knows the repository
// it was loaded from.
javaClass.setRepository(Repository.getRepository());
if (DEBUG_MISSING_CLASSES && !(javaClass.getRepository() instanceof AnalysisCacheToRepositoryAdapter)) {
throw new IllegalStateException("this should not happen");
}
return javaClass;
} catch (RuntimeException e) {
throw new RuntimeException("Unable to parse classfile for " + descriptor, e);
} catch (IOException e) {
throw new ResourceNotFoundException(descriptor.toResourceName(), e);
}
}
/*
* (non-Javadoc)
*
* @see
* edu.umd.cs.findbugs.classfile.IAnalysisEngine#registerWith(edu.umd.cs
* .findbugs.classfile.IAnalysisCache)
*/
@Override
public void registerWith(IAnalysisCache analysisCache) {
analysisCache.registerClassAnalysisEngine(JavaClass.class, this);
}
/*
* (non-Javadoc)
*
* @see edu.umd.cs.findbugs.classfile.IAnalysisEngine#canRecompute()
*/
@Override
public boolean canRecompute() {
// Currently, JavaClass objects are compared by reference equality in
// some places,
// so we can't recompute them. (Plus, most detectors/analyses need
// the JavaClass object, so keeping them in memory helps performance.)
return false;
}
}