import com.sun.org.apache.bcel.internal.classfile.CodeException;

 * This class represents an exception handler, i.e., specifies the region where

 * @version $Id: CodeExceptionGen.java 1749603 2016-06-21 20:50:19Z ggregory $

 * @see MethodGen

 * @see CodeException

 * @see InstructionHandle

public final class CodeExceptionGen implements InstructionTargeter, Cloneable {

    private InstructionHandle start_pc;

    private InstructionHandle end_pc;

    private InstructionHandle handler_pc;

    private ObjectType catch_type;

    /**

     * Add an exception handler, i.e., specify region where a handler is active

     * and an instruction where the actual handling is done.

     *

     * @param start_pc Start of handled region (inclusive)

     * @param end_pc End of handled region (inclusive)

     * @param handler_pc Where handling is done

     * @param catch_type which exception is handled, null for ANY

     */

    public CodeExceptionGen(final InstructionHandle start_pc, final InstructionHandle end_pc,

            final InstructionHandle handler_pc, final ObjectType catch_type) {

        setStartPC(start_pc);

        setEndPC(end_pc);

        setHandlerPC(handler_pc);

        this.catch_type = catch_type;

    }

    /**

     * Get CodeException object.<BR>

     *

     * This relies on that the instruction list has already been dumped to byte

     * code or or that the `setPositions' methods has been called for the

     * instruction list.

     *

     * @param cp constant pool

     */

    public CodeException getCodeException(final ConstantPoolGen cp) {

        return new CodeException(start_pc.getPosition(), end_pc.getPosition()

                + end_pc.getInstruction().getLength(), handler_pc.getPosition(),

                (catch_type == null) ? 0 : cp.addClass(catch_type));

    }

    /* Set start of handler

     * @param start_pc Start of handled region (inclusive)

     */

    public void setStartPC(final InstructionHandle start_pc) { // TODO could be package-protected?

        BranchInstruction.notifyTarget(this.start_pc, start_pc, this);

        this.start_pc = start_pc;

    }

    /* Set end of handler

     * @param end_pc End of handled region (inclusive)

     */

    public void setEndPC(final InstructionHandle end_pc) { // TODO could be package-protected?

        BranchInstruction.notifyTarget(this.end_pc, end_pc, this);

        this.end_pc = end_pc;

    }

    /* Set handler code

     * @param handler_pc Start of handler

     */

    public void setHandlerPC(final InstructionHandle handler_pc) { // TODO could be package-protected?

        BranchInstruction.notifyTarget(this.handler_pc, handler_pc, this);

        this.handler_pc = handler_pc;

    /**

     * @param old_ih old target, either start or end

     * @param new_ih new target

     */

    @Override

    public void updateTarget(final InstructionHandle old_ih, final InstructionHandle new_ih) {

        boolean targeted = false;

        if (start_pc == old_ih) {

            targeted = true;

            setStartPC(new_ih);

        }

        if (end_pc == old_ih) {

            targeted = true;

            setEndPC(new_ih);

        }

        if (handler_pc == old_ih) {

            targeted = true;

            setHandlerPC(new_ih);

        }

        if (!targeted) {

            throw new ClassGenException("Not targeting " + old_ih + ", but {" + start_pc + ", "

                    + end_pc + ", " + handler_pc + "}");

        }

    /**

     * @return true, if ih is target of this handler

     */

    @Override

    public boolean containsTarget(final InstructionHandle ih) {

        return (start_pc == ih) || (end_pc == ih) || (handler_pc == ih);

    }

    /**

     * Sets the type of the Exception to catch. Set 'null' for ANY.

     */

    public void setCatchType(final ObjectType catch_type) {

        this.catch_type = catch_type;

    /**

     * Gets the type of the Exception to catch, 'null' for ANY.

     */

    public ObjectType getCatchType() {

        return catch_type;

    }

    /**

     * @return start of handled region (inclusive)

     */

    public InstructionHandle getStartPC() {

        return start_pc;

    }

    /**

     * @return end of handled region (inclusive)

     */

    public InstructionHandle getEndPC() {

        return end_pc;

    }

    /**

     * @return start of handler

     */

    public InstructionHandle getHandlerPC() {

        return handler_pc;

    }

    @Override

    public String toString() {

        return "CodeExceptionGen(" + start_pc + ", " + end_pc + ", " + handler_pc + ")";

    }

    @Override

    public Object clone() {

        try {

            return super.clone();

        } catch (final CloneNotSupportedException e) {

            throw new Error("Clone Not Supported"); // never happens

        }