/*
 * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 */

package javax.script;

/**
 * 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 static final long serialVersionUID = 8265071037049225001L;

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

 /**
 * 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 <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 <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;
 }

 /**
 * <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.
 * @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.
 * @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.
 * @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.
 * @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;
 }
}