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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
import org.mozilla.javascript.*;
import java.util.List;
import java.util.ArrayList;
/**
* Matrix: An example host object class that implements the Scriptable interface.
*
* Built-in JavaScript arrays don't handle multiple dimensions gracefully: the
* script writer must create every array in an array of arrays. The Matrix class
* takes care of that by automatically allocating arrays for every index that
* is accessed. What's more, the Matrix constructor takes a integer argument
* that specifies the dimension of the Matrix. If m is a Matrix with dimension 3,
* then m[0] will be a Matrix with dimension 1, and m[0][0] will be an Array.
*
* Here's a shell session showing the Matrix object in action:
*
* js> defineClass("Matrix")
* js> var m = new Matrix(2); // A constructor call, see "Matrix(int dimension)"
* js> m // Object.toString will call "Matrix.getClassName()"
* [object Matrix]
* js> m[0][0] = 3;
* 3
* js> uneval(m[0]); // an array was created automatically!
* [3]
* js> uneval(m[1]); // array is created even if we don't set a value
* []
* js> m.dim; // we can access the "dim" property
* 2
* js> m.dim = 3;
* 3
* js> m.dim; // but not modify the "dim" property
* 2
*
*
* @see org.mozilla.javascript.Context
* @see org.mozilla.javascript.Scriptable
*
* @author Norris Boyd
*/
public class Matrix implements Scriptable {
/**
* The zero-parameter constructor.
*
* When ScriptableObject.defineClass is called with this class, it will
* construct Matrix.prototype using this constructor.
*/
public Matrix() {
}
/**
* The Java constructor, also used to define the JavaScript constructor.
*/
public Matrix(int dimension) {
if (dimension <= 0) {
throw Context.reportRuntimeError(
"Dimension of Matrix must be greater than zero");
}
dim = dimension;
list = new ArrayList