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package javax.script;

The generic Exception class for the Scripting APIs.  Checked
exception types thrown by underlying scripting implementations must be wrapped in instances of
ScriptException.  The class has members to store line and column numbers and
filenames if this information is available.
Author:
Mike Grogan
Since:
1.6/**
 * The generic <code>Exception</code> class for the Scripting APIs.  Checked
 * exception types thrown by underlying scripting implementations must be wrapped in instances of
 * <code>ScriptException</code>.  The class has members to store line and column numbers and
 * filenames if this information is available.
 *
 * @author Mike Grogan
 * @since 1.6
 */
public class ScriptException extends Exception {

    private String fileName;
    private int lineNumber;
    private int columnNumber;

    
Creates a ScriptException with a String to be used in its message.
Filename, and line and column numbers are unspecified.
Params:
s – The String to use in the message./**
     * Creates a <code>ScriptException</code> with a String to be used in its message.
     * Filename, and line and column numbers are unspecified.
     *
     * @param s The String to use in the message.
     */
    public ScriptException(String s) {
        super(s);
        fileName = null;
        lineNumber = -1;
        columnNumber = -1;
    }

    
Creates a ScriptException wrapping an Exception thrown by an underlying
interpreter.  Line and column numbers and filename are unspecified.
Params:
e – The wrapped Exception./**
     * Creates a <code>ScriptException</code> wrapping an <code>Exception</code> thrown by an underlying
     * interpreter.  Line and column numbers and filename are unspecified.
     *
     * @param e The wrapped <code>Exception</code>.
     */
    public ScriptException(Exception e) {
        super(e);
        fileName = null;
        lineNumber = -1;
        columnNumber = -1;
    }

    
Creates a ScriptException with message, filename and linenumber to
be used in error messages.
Params:
message – The string to use in the message
fileName – The file or resource name describing the location of a script error
causing the ScriptException to be thrown.
lineNumber – A line number describing the location of a script error causing
the ScriptException to be thrown./**
     * Creates a <code>ScriptException</code> with message, filename and linenumber to
     * be used in error messages.
     *
     * @param message The string to use in the message
     *
     * @param fileName The file or resource name describing the location of a script error
     * causing the <code>ScriptException</code> to be thrown.
     *
     * @param lineNumber A line number describing the location of a script error causing
     * the <code>ScriptException</code> to be thrown.
     */
    public ScriptException(String message, String fileName, int lineNumber) {
        super(message);
        this.fileName = fileName;
        this.lineNumber = lineNumber;
        this.columnNumber = -1;
    }

    
ScriptException constructor specifying message, filename, line number
and column number.
Params:
message – The message.
fileName – The filename
lineNumber – the line number.
columnNumber – the column number./**
     * <code>ScriptException</code> constructor specifying message, filename, line number
     * and column number.
     * @param message The message.
     * @param fileName The filename
     * @param lineNumber the line number.
     * @param columnNumber the column number.
     */
    public ScriptException(String message,
            String fileName,
            int lineNumber,
            int columnNumber) {
        super(message);
        this.fileName = fileName;
        this.lineNumber = lineNumber;
        this.columnNumber = columnNumber;
    }

    
Returns a message containing the String passed to a constructor as well as
line and column numbers and filename if any of these are known.
Returns:
The error message./**
     * Returns a message containing the String passed to a constructor as well as
     * line and column numbers and filename if any of these are known.
     * @return The error message.
     */
    public String getMessage() {
        String ret = super.getMessage();
        if (fileName != null) {
            ret += (" in " + fileName);
            if (lineNumber != -1) {
                ret += " at line number " + lineNumber;
            }

            if (columnNumber != -1) {
                ret += " at column number " + columnNumber;
            }
        }

        return ret;
    }

    
Get the line number on which an error occurred.
Returns:
The line number.  Returns -1 if a line number is unavailable./**
     * Get the line number on which an error occurred.
     * @return The line number.  Returns -1 if a line number is unavailable.
     */
    public int getLineNumber() {
        return lineNumber;
    }

    
Get the column number on which an error occurred.
Returns:
The column number.  Returns -1 if a column number is unavailable./**
     * Get the column number on which an error occurred.
     * @return The column number.  Returns -1 if a column number is unavailable.
     */
    public int getColumnNumber() {
        return columnNumber;
    }

    
Get the source of the script causing the error.
Returns:
The file name of the script or some other string describing the script
source.  May return some implementation-defined string such as <unknown>
if a description of the source is unavailable./**
     * Get the source of the script causing the error.
     * @return The file name of the script or some other string describing the script
     * source.  May return some implementation-defined string such as <i>&lt;unknown&gt;</i>
     * if a description of the source is unavailable.
     */
    public String getFileName() {
        return fileName;
    }
}