Scala example source code file (Handler.java)

This example Scala source code file (Handler.java) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

asm, handler, label, string

The Handler.java Scala example source code

/***
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2011 INRIA, France Telecom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package scala.tools.asm;

/**
 * Information about an exception handler block.
 *
 * @author Eric Bruneton
 */
class Handler {

    /**
     * Beginning of the exception handler's scope (inclusive).
     */
    Label start;

    /**
     * End of the exception handler's scope (exclusive).
     */
    Label end;

    /**
     * Beginning of the exception handler's code.
     */
    Label handler;

    /**
     * Internal name of the type of exceptions handled by this handler, or
     * <tt>null</tt> to catch any exceptions.
     */
    String desc;

    /**
     * Constant pool index of the internal name of the type of exceptions
     * handled by this handler, or 0 to catch any exceptions.
     */
    int type;

    /**
     * Next exception handler block info.
     */
    Handler next;

    /**
     * Removes the range between start and end from the given exception
     * handlers.
     *
     * @param h
     *            an exception handler list.
     * @param start
     *            the start of the range to be removed.
     * @param end
     *            the end of the range to be removed. Maybe null.
     * @return the exception handler list with the start-end range removed.
     */
    static Handler remove(Handler h, Label start, Label end) {
        if (h == null) {
            return null;
        } else {
            h.next = remove(h.next, start, end);
        }
        int hstart = h.start.position;
        int hend = h.end.position;
        int s = start.position;
        int e = end == null ? Integer.MAX_VALUE : end.position;
        // if [hstart,hend[ and [s,e[ intervals intersect...
        if (s < hend && e > hstart) {
            if (s <= hstart) {
                if (e >= hend) {
                    // [hstart,hend[ fully included in [s,e[, h removed
                    h = h.next;
                } else {
                    // [hstart,hend[ minus [s,e[ = [e,hend[
                    h.start = end;
                }
            } else if (e >= hend) {
                // [hstart,hend[ minus [s,e[ = [hstart,s[
                h.end = start;
            } else {
                // [hstart,hend[ minus [s,e[ = [hstart,s[ + [e,hend[
                Handler g = new Handler();
                g.start = end;
                g.end = h.end;
                g.handler = h.handler;
                g.desc = h.desc;
                g.type = h.type;
                g.next = h.next;
                h.end = start;
                h.next = g;
            }
        }
        return h;
    }
}