import java.io.DataInput;

import java.io.DataOutputStream;

import java.io.IOException;

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

public final class LineNumber implements Cloneable, Node {

    /** Program Counter (PC) corresponds to line */

    private short start_pc;

    /** number in source file */

    private short line_number;

    /**

     * Initialize from another object.

     *

     * @param c the object to copy

     */

    public LineNumber(final LineNumber c) {

        this(c.getStartPC(), c.getLineNumber());

    }

    /**

     * Construct object from file stream.

     *

     * @param file Input stream

     * @throws IOEXception if an I/O Exception occurs in readUnsignedShort

     */

    LineNumber(final DataInput file) throws IOException {

        this(file.readUnsignedShort(), file.readUnsignedShort());

    }

    /**

     * @param start_pc Program Counter (PC) corresponds to

     * @param line_number line number in source file

     */

    public LineNumber(final int start_pc, final int line_number) {

        this.start_pc = (short) start_pc;

        this.line_number = (short)line_number;

    }

    /**

     * Called by objects that are traversing the nodes of the tree implicitely

     * defined by the contents of a Java class. I.e., the hierarchy of methods,

     * fields, attributes, etc. spawns a tree of objects.

     *

     * @param v Visitor object

     */

    @Override

    public void accept( final Visitor v ) {

        v.visitLineNumber(this);

    }

    /**

     * Dump line number/pc pair to file stream in binary format.

     *

     * @param file Output file stream

     * @throws IOEXception if an I/O Exception occurs in writeShort

     */

    public final void dump( final DataOutputStream file ) throws IOException {

        file.writeShort(start_pc);

        file.writeShort(line_number);

    }

    /**

     * @return Corresponding source line

     */

    public final int getLineNumber() {

        return 0xffff & line_number;

    }

    /**

     * @return PC in code

     */

    public final int getStartPC() {

        return  0xffff & start_pc;

    }

    /**

     * @param line_number the source line number

     */

    public final void setLineNumber( final int line_number ) {

        this.line_number = (short) line_number;

    }

    /**

     * @param start_pc the pc for this line number

     */

    public final void setStartPC( final int start_pc ) {

        this.start_pc = (short) start_pc;

    }

    /**

     * @return String representation

     */

    @Override

    public final String toString() {

        return "LineNumber(" + start_pc + ", " + line_number + ")";

    }

    /**

     * @return deep copy of this object

     */

    public LineNumber copy() {

        try {

            return (LineNumber) clone();

        } catch (final CloneNotSupportedException e) {

            // TODO should this throw?

        }

        return null;

    }