/*
 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.graal.boot.meta;

import java.util.*;

import com.oracle.graal.api.meta.*;
import com.oracle.graal.boot.*;
import com.oracle.graal.graph.*;
import com.oracle.graal.nodes.java.*;


public class CastElement extends Element {

    private CheckCastNode checkCastNode;

    public CastElement(CheckCastNode checkCastNode) {
        super(checkCastNode.targetClass());
        this.checkCastNode = checkCastNode;
        this.usages.add(checkCastNode);
    }

    @Override
    protected synchronized void unionTypes(BigBang bb, Node sourceNode, Set<ResolvedJavaType> newSeenTypes) {
        Set<ResolvedJavaType> newSet = new HashSet<>();
        // Filter through checkcast.
        for (ResolvedJavaType type : newSeenTypes) {
            if (type.isSubtypeOf(checkCastNode.targetClass())) {
                newSet.add(type);
            } else {
                BigBang.out.println("filtering " + type + " vs " + checkCastNode.targetClass());
            }
        }
        super.unionTypes(bb, sourceNode, newSet);
    }

    @Override
    public String toString() {
        return "cast " + checkCastNode.targetClass();
    }
}