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/*
 * FindBugs - Find bugs in Java programs
 * Copyright (C) 2004, 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.detect;

import org.apache.bcel.Const;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.Instruction;
import org.apache.bcel.generic.ObjectType;

import edu.umd.cs.findbugs.ba.Hierarchy;
import edu.umd.cs.findbugs.ba.Location;
import edu.umd.cs.findbugs.ba.ObjectTypeFactory;
import edu.umd.cs.findbugs.ba.RepositoryLookupFailureCallback;

/**
 * A StreamFactory for normal java.io streams that are created using NEW
 * instructions.
 */
public class IOStreamFactory implements StreamFactory {
    private final ObjectType baseClassType;

    private final ObjectType[] uninterestingSubclassTypeList;

    private final String bugType;

    @Override
    public String toString() {
        return "IOStreamFactory(" + baseClassType + ")";
    }

    public IOStreamFactory(String baseClass, String[] uninterestingSubclassList, String bugType) {
        this.baseClassType = ObjectTypeFactory.getInstance(baseClass);
        this.uninterestingSubclassTypeList = new ObjectType[uninterestingSubclassList.length];
        for (int i = 0; i < uninterestingSubclassList.length; ++i) {
            this.uninterestingSubclassTypeList[i] = ObjectTypeFactory.getInstance(uninterestingSubclassList[i]);
        }
        this.bugType = bugType;
    }

    @Override
    public Stream createStream(Location location, ObjectType type, ConstantPoolGen cpg,
            RepositoryLookupFailureCallback lookupFailureCallback) {

        try {
            Instruction ins = location.getHandle().getInstruction();

            if (ins.getOpcode() != Const.NEW) {
                return null;
            }

            if (Hierarchy.isSubtype(type, baseClassType)) {
                boolean isUninteresting = false;
                for (ObjectType aUninterestingSubclassTypeList : uninterestingSubclassTypeList) {
                    if (Hierarchy.isSubtype(type, aUninterestingSubclassTypeList)) {
                        isUninteresting = true;
                        break;
                    }
                }
                Stream result = new Stream(location, type.getClassName(), baseClassType.getClassName())
                        .setIgnoreImplicitExceptions(true);
                if (!isUninteresting) {
                    result.setInteresting(bugType);
                }
                return result;
            }
        } catch (ClassNotFoundException e) {
            lookupFailureCallback.reportMissingClass(e);
        }

        return null;
    }
}