dynmap/DynmapCore/src/main/java/org/dynmap/utils/MapChunkCache.java

package org.dynmap.utils;

import org.dynmap.DynmapWorld;

public abstract class MapChunkCache {
    public enum HiddenChunkStyle {
        FILL_AIR("air"),
        FILL_STONE_PLAIN("stone"),
        FILL_OCEAN("ocean");
    	
        private final String val;
        HiddenChunkStyle(String v) { val = v; }
        public String getValue() { return val; }
        public static HiddenChunkStyle fromValue(String s) {
			for (HiddenChunkStyle v : HiddenChunkStyle.values()) {
        		if (v.val.equals(s)) {
        			return v;
        		}
        	}
			return null;
        }
    };
    public enum ChunkStats {
        CACHED_SNAPSHOT_HIT("Cached"),          // Stats for cached snapshot hits
        LOADED_CHUNKS("Already Loaded"),        // Stats for snapshotting already loaded chunks
        UNLOADED_CHUNKS("Load Required"),     // Stats for chunks requiring load/unload
        UNGENERATED_CHUNKS("Not Generated");    // Stats for chunks requested that did not exist
        private final String label;
        ChunkStats(String lbl) {
            label = lbl;
        }
        public String getLabel() { return label; }
    };
    
    private long timeTotal[] = new long[ChunkStats.values().length];
    private int cntTotal[] = new int[ChunkStats.values().length];

    /**
     * Set chunk data type needed
     * @param blockdata - need block type and data for chunk
     * @param biome - need biome data
     * @param highestblocky - need highest-block-y data
     * @param rawbiome - need raw biome temp/rain data
     * @return true if all data types can be retrieved, false if not
     */
    public abstract boolean setChunkDataTypes(boolean blockdata, boolean biome, boolean highestblocky, boolean rawbiome);
    /**
     * Load chunks into cache
     * @param maxToLoad - maximum number to load at once
     * @return number loaded
     */
    public abstract int loadChunks(int maxToLoad);
    /**
     * Test if done loading
     * @return true if load completed
     */
    public abstract boolean isDoneLoading();
    /**
     * Test if all empty blocks
     * @return true if empty
     */
    public abstract boolean isEmpty();
    /**
     * Unload chunks
     */
    public abstract void unloadChunks();
    /**
     * Test if section (16 x 16 x 16) at given coord is empty (all air)
     * @param sx - section X
     * @param sy - section Y
     * @param sz - section Z
     * @return true if empty
     */
    public abstract boolean isEmptySection(int sx, int sy, int sz);
    /**
     * Get cache iterator
     * @param x - x coord
     * @param y - y coord
     * @param z - z coord
     * @return iterator
     */
    public abstract MapIterator getIterator(int x, int y, int z);
    /**
     * Set hidden chunk style (default is FILL_AIR)
     * @param style - hide style
     */
    public abstract void setHiddenFillStyle(HiddenChunkStyle style);
    /**
     * Add visible area limit - can be called more than once 
     * Needs to be set before chunks are loaded
     * Coordinates are block coordinates
     * @param limit - limits of visible area
     */
    public abstract void setVisibleRange(VisibilityLimit limit);
    /**
     * Add hidden area limit - can be called more than once 
     * Needs to be set before chunks are loaded
     * Coordinates are block coordinates
     * @param limit - limits of hidden area
     */
    public abstract void setHiddenRange(VisibilityLimit limit);
    /**
     * Get world
     * @return world
     */
    public abstract DynmapWorld getWorld();
    /**
     * Get number of chunks with given disposition
     * @param type - chunk load type
     * @return total count
     */
    public int getChunksLoaded(ChunkStats type) {
        return cntTotal[type.ordinal()];
    }
    /**
     * Get total run time processing chunks with given disposition
     * @param type - chunk load type
     * @return total in nanoseconds
     */
    public long getTotalRuntimeNanos(ChunkStats type) {
        return timeTotal[type.ordinal()];
    }
    
    protected void endChunkLoad(long startTime, ChunkStats type) {
        int ord = type.ordinal();
        timeTotal[ord] += System.nanoTime() - startTime;
        cntTotal[ord]++;
    }
}