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/*
 * 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.heap.LoadAnalysis;
import edu.umd.cs.findbugs.ba.heap.LoadDataflow;
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 LoadDataflow objects for analyzed methods.
 *
 * @author David Hovemeyer
 */
public class LoadDataflowFactory extends AnalysisFactory {
    /**
     * Constructor.
     */
    public LoadDataflowFactory() {
        super("field load analysis", LoadDataflow.class);
    }

    /*
     * (non-Javadoc)
     *
     * @see
     * edu.umd.cs.findbugs.classfile.IAnalysisEngine#analyze(edu.umd.cs.findbugs
     * .classfile.IAnalysisCache, java.lang.Object)
     */
    @Override
    public LoadDataflow analyze(IAnalysisCache analysisCache, MethodDescriptor descriptor) throws CheckedAnalysisException {
        MethodGen methodGen = getMethodGen(analysisCache, descriptor);
        if (methodGen == null) {
            return null;
        }
        LoadAnalysis analysis = new LoadAnalysis(getDepthFirstSearch(analysisCache, descriptor), getConstantPoolGen(
                analysisCache, descriptor.getClassDescriptor()));
        LoadDataflow dataflow = new LoadDataflow(getCFG(analysisCache, descriptor), analysis);
        dataflow.execute();
        return dataflow;
    }
}