/*
* FindBugs - Find Bugs in Java programs
* Copyright (C) 2003-2007 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 org.apache.bcel.generic.MethodGen;
import edu.umd.cs.findbugs.ba.AssertionMethods;
import edu.umd.cs.findbugs.ba.CFG;
import edu.umd.cs.findbugs.ba.ClassContext;
import edu.umd.cs.findbugs.ba.DepthFirstSearch;
import edu.umd.cs.findbugs.ba.JavaClassAndMethod;
import edu.umd.cs.findbugs.ba.MethodUnprofitableException;
import edu.umd.cs.findbugs.ba.npe.IsNullValueAnalysis;
import edu.umd.cs.findbugs.ba.npe.IsNullValueDataflow;
import edu.umd.cs.findbugs.ba.type.TypeDataflow;
import edu.umd.cs.findbugs.ba.vna.ValueNumberDataflow;
import edu.umd.cs.findbugs.classfile.CheckedAnalysisException;
import edu.umd.cs.findbugs.classfile.IAnalysisCache;
import edu.umd.cs.findbugs.classfile.MethodDescriptor;
/**
* Analysis engine to produce IsNullValueDataflow objects for an analyzed
* method.
*
* @author David Hovemeyer
*/
public class IsNullValueDataflowFactory extends AnalysisFactory<IsNullValueDataflow> {
/**
* Constructor.
*/
public IsNullValueDataflowFactory() {
super("null value analysis", IsNullValueDataflow.class);
}
/*
* (non-Javadoc)
*
* @see
* edu.umd.cs.findbugs.classfile.IAnalysisEngine#analyze(edu.umd.cs.findbugs
* .classfile.IAnalysisCache, java.lang.Object)
*/
@Override
public IsNullValueDataflow analyze(IAnalysisCache analysisCache, MethodDescriptor descriptor) throws CheckedAnalysisException {
MethodGen methodGen = getMethodGen(analysisCache, descriptor);
if (methodGen == null) {
throw new MethodUnprofitableException(descriptor);
}
CFG cfg = getCFG(analysisCache, descriptor);
ValueNumberDataflow vnaDataflow = getValueNumberDataflow(analysisCache, descriptor);
DepthFirstSearch dfs = getDepthFirstSearch(analysisCache, descriptor);
AssertionMethods assertionMethods = getAssertionMethods(analysisCache, descriptor.getClassDescriptor());
TypeDataflow typeDataflow = getTypeDataflow(analysisCache, descriptor);
IsNullValueAnalysis invAnalysis = new IsNullValueAnalysis(descriptor, methodGen, cfg, vnaDataflow, typeDataflow, dfs,
assertionMethods);
// Set return value and parameter databases
invAnalysis.setClassAndMethod(new JavaClassAndMethod(getJavaClass(analysisCache, descriptor.getClassDescriptor()),
getMethod(analysisCache, descriptor)));
IsNullValueDataflow invDataflow = new IsNullValueDataflow(cfg, invAnalysis);
invDataflow.execute();
if (ClassContext.DUMP_DATAFLOW_ANALYSIS) {
invDataflow.dumpDataflow(invAnalysis);
}
return invDataflow;
}
}