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

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

/**
 * An object that examines a Location and determines if a Stream is created
 * there.
 */
public interface StreamFactory {
    /**
     * Determine if a Stream is created at given location.
     *
     * @param location
     *            the Location
     * @param type
     *            the ObjectType associated with the instruction at the
     *            location; the StreamResourceTracker prescreens for
     *            TypedInstructions that are associated with ObjectTypes, since
     *            they are the only instructions that could conceivably create a
     *            stream object
     * @param cpg
     *            the ConstantPoolGen for the method
     * @param lookupFailureCallback
     *            used to report missing classes in the class hierarchy
     * @return a Stream created at the Location, or null if no stream is created
     *         there
     */
    public Stream createStream(Location location, ObjectType type, ConstantPoolGen cpg,
            RepositoryLookupFailureCallback lookupFailureCallback);
}