VertexCache.java

/**
 * Copyright (C) 2013 Gundog Studios LLC.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.gundogstudios.models.tristripper;

import java.util.Arrays;

class VertexCache {

	int[] entries;
	int numEntries;

	public VertexCache() {
		this(16);
	}

	public VertexCache(int size) {
		numEntries = size;
		entries = new int[numEntries];
		clear();
	}

	public boolean inCache(int entry) {
		for (int i = 0; i < numEntries; i++) {
			if (entries[i] == entry) {
				return true;
			}
		}
		return false;
	}

	public int addEntry(int entry) {
		int removed;

		removed = entries[numEntries - 1];

		// push everything right one
		for (int i = numEntries - 2; i >= 0; i--) {
			entries[i + 1] = entries[i];
		}

		entries[0] = entry;

		return removed;
	}

	public void clear() {
		Arrays.fill(entries, -1);
	}

	public int at(int index) {
		return entries[index];
	}

	public void set(int index, int value) {
		entries[index] = value;
	}

	public void copy(VertexCache inVcache) {
		for (int i = 0; i < numEntries; i++) {
			inVcache.set(i, entries[i]);
		}
	}

}