src/share/tools/IdealGraphVisualizer/Filter/src/com/sun/hotspot/igv/filter/RemoveSelfLoopsFilter.java

/*
 * Copyright (c) 2008, 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.sun.hotspot.igv.filter;

import com.sun.hotspot.igv.graph.Connection;
import com.sun.hotspot.igv.graph.Diagram;
import com.sun.hotspot.igv.graph.Figure;
import com.sun.hotspot.igv.graph.InputSlot;
import com.sun.hotspot.igv.graph.OutputSlot;
import java.util.ArrayList;
import java.util.List;

/**
 *
 * @author Thomas Wuerthinger
 */
public class RemoveSelfLoopsFilter extends AbstractFilter {

    private String name;

    /** Creates a new instance of RemoveSelfLoops */
    public RemoveSelfLoopsFilter(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void apply(Diagram d) {

        for (Figure f : d.getFigures()) {

            for (InputSlot is : f.getInputSlots()) {

                List<Connection> toRemove = new ArrayList<Connection>();
                for (Connection c : is.getConnections()) {

                    if (c.getOutputSlot().getFigure() == f) {
                        toRemove.add(c);
                    }
                }

                for (Connection c : toRemove) {

                    c.remove();

                    OutputSlot os = c.getOutputSlot();
                    if (os.getConnections().size() == 0) {
                        f.removeSlot(os);
                    }

                    c.getInputSlot().setShortName("O");
                    c.getInputSlot().setName("Self Loop");
                }
            }
        }
    }
}