Class Matrix

examples/src/main/java/Matrix.java:49–246

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

 * @author Norris Boyd
 */
public class Matrix implements Scriptable {

    /**
     * The zero-parameter constructor.
     *
     * <p>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.
     *
     * @param dimension the number of dimensions
     */
    public Matrix(int dimension) {
        if (dimension <= 0) {
            throw Context.reportRuntimeError("Dimension of Matrix must be greater than zero");
        }
        dim = dimension;
        list = new ArrayList<Object>();
    }

    /** Returns the name of this JavaScript class, "Matrix". */
    @Override
    public String getClassName() {
        return "Matrix";
    }

    /**
     * Defines the "dim" property by returning true if name is equal to "dim".
     *
     * <p>Defines no other properties, i.e., returns false for all other names.
     *
     * @param name the name of the property
     * @param start the object where lookup began
     */
    @Override
    public boolean has(String name, Scriptable start) {
        return name.equals("dim");
    }

    /**
     * Defines all numeric properties by returning true.
     *
     * @param index the index of the property
     * @param start the object where lookup began
     */
    @Override
    public boolean has(int index, Scriptable start) {
        return true;
    }

    /**
     * Get the named property.
     *
     * <p>Handles the "dim" property and returns NOT_FOUND for all other names.
     *