Class AbstractItem

src/main/java/wycc/util/AbstractItem.java:24–309

import wycc.lang.Syntactic.Item;

public abstract class AbstractItem implements Comparable<Item>, Item, Cloneable {
	// Constants;
	private Syntactic.Heap parent;
	private int index; // index in the parent
	protected int opcode;
	protected Item[] operands;
	protected byte[] data;

	public AbstractItem(int opcode) {
		super();
		this.opcode = opcode;
		this.operands = null;
		this.data = null;
	}

	public AbstractItem(int opcode, Item... operands) {
		this.opcode = opcode;
		this.operands = operands;
		this.data = null;
	}

	protected AbstractItem(int opcode, byte[] data, Item... operands) {
		this.opcode = opcode;
		this.operands = operands;
		this.data = data;
	}

	@Override
	public Syntactic.Heap getHeap() {
		return parent;
	}

	@Override
	public void allocate(Syntactic.Heap heap, int index) {
		if(parent != null && parent != heap) {
			throw new IllegalArgumentException(
					"item already allocated to different heap (" + getClass().getName() + ";" + parent + ", " + heap
							+ ")");
		}

		this.parent = heap;
		this.index = index;
	}

	/**
	 * Get the first syntactic item of a given kind which refers to this item.
	 *
	 * @param kind
	 * @return
	 */
	@Override
	public <T extends Item> T getParent(Class<T> kind) {
		return parent.getParent(this, kind);
	}

	/**
	 * Get all syntactic items of a given kind which refer to this item.
	 *