Remove needless since javadoc tags

- Should fix #3504

Core/src/main/java/com/plotsquared/core/generator/HybridPlotWorld.java

@@ -81,6 +81,9 @@ public class HybridPlotWorld extends ClassicPlotWorld {
     public short PATH_WIDTH_UPPER;
     public HashMap<Integer, BaseBlock[]> G_SCH;
     public HashMap<Integer, BiomeType> G_SCH_B;
+    /**
+     * The Y level at which schematic generation will start, lowest of either road or plot schematic generation.
+     */
     public int SCHEM_Y;
     private Location SIGN_LOCATION;
     private File root = null;
@@ -273,33 +276,57 @@ public class HybridPlotWorld extends ClassicPlotWorld {
         int oddshift = (this.ROAD_WIDTH & 1);
 
         SCHEM_Y = schematicStartHeight();
+
+        // plotY and roadY are important to allow plot and/or road schematic "overflow" into each other without causing AIOOB
+        //  exceptions when attempting either to set blocks to, or get block from G_SCH
+        // Default plot schematic start height, normalized to the minimum height schematics are pasted from.
         int plotY = PLOT_HEIGHT - SCHEM_Y;
         int minRoadWall = Settings.Schematics.USE_WALL_IN_ROAD_SCHEM_HEIGHT ? Math.min(ROAD_HEIGHT, WALL_HEIGHT) : ROAD_HEIGHT;
+        // Default road schematic start height, normalized to the minimum height schematics are pasted from.
         int roadY = minRoadWall - SCHEM_Y;
 
-        int worldHeight = getMaxGenHeight() - getMinGenHeight() + 1;
+        int worldGenHeight = getMaxGenHeight() - getMinGenHeight() + 1;
+
+        int maxSchematicHeight = 0;
 
         // SCHEM_Y should be normalised to the plot "start" height
         if (schematic3 != null) {
-            if (schematic3.getClipboard().getDimensions().getY() == worldHeight) {
-                SCHEM_Y = plotY = 0;
+            if ((maxSchematicHeight = schematic3.getClipboard().getDimensions().getY()) == worldGenHeight) {
+                SCHEM_Y = getMinGenHeight();
+                plotY = 0;
             } else if (!Settings.Schematics.PASTE_ON_TOP) {
-                SCHEM_Y = plotY = getMinBuildHeight() - getMinGenHeight();
+                SCHEM_Y = getMinBuildHeight();
+                plotY = 0;
             }
         }
 
         if (schematic1 != null) {
-            if (schematic1.getClipboard().getDimensions().getY() == worldHeight) {
-                SCHEM_Y = roadY = getMinGenHeight();
-                if (schematic3 != null && schematic3.getClipboard().getDimensions().getY() != worldHeight
-                        && !Settings.Schematics.PASTE_ON_TOP) {
-                    plotY = PLOT_HEIGHT;
+            if ((maxSchematicHeight = Math.max(
+                    schematic1.getClipboard().getDimensions().getY(),
+                    maxSchematicHeight
+            )) == worldGenHeight) {
+                SCHEM_Y = getMinGenHeight();
+                roadY = 0; // Road is the lowest schematic
+                if (schematic3 != null && schematic3.getClipboard().getDimensions().getY() != worldGenHeight) {
+                    // Road is the lowest schematic. Normalize plotY to it.
+                    if (Settings.Schematics.PASTE_ON_TOP) {
+                        plotY = PLOT_HEIGHT - getMinGenHeight();
+                    } else {
+                        plotY = getMinBuildHeight() - getMinGenHeight();
+                    }
                 }
             } else if (!Settings.Schematics.PASTE_ROAD_ON_TOP) {
-                SCHEM_Y = roadY = getMinBuildHeight();
-                if (schematic3 != null && schematic3.getClipboard().getDimensions().getY() != worldHeight
-                        && !Settings.Schematics.PASTE_ON_TOP) {
-                    plotY = PLOT_HEIGHT;
+                if (SCHEM_Y == getMinGenHeight()) { // Only possible if plot schematic is enabled
+                    // Plot is still the lowest schematic, normalize roadY to it
+                    roadY = getMinBuildHeight() - getMinGenHeight();
+                } else if (schematic3 != null) {
+                    SCHEM_Y = getMinBuildHeight();
+                    roadY = 0;// Road is the lowest schematic
+                    if (Settings.Schematics.PASTE_ON_TOP) {
+                        // Road is the lowest schematic. Normalize plotY to it.
+                        plotY = PLOT_HEIGHT - getMinBuildHeight();
+                    }
+                    // If plot schematic is not paste-on-top, it will be from min build height thus plotY = 0 as well already.
                 }
             }
         }
@@ -337,17 +364,15 @@ public class HybridPlotWorld extends ClassicPlotWorld {
                                 y + min.getBlockY(),
                                 z + min.getBlockZ()
                         ));
-                        if (!id.getBlockType().getMaterial().isAir()) {
-                            schem3PopulationNeeded |= id.hasNbtData();
-                            addOverlayBlock(
-                                    (short) (x + shift + oddshift + centerShiftX),
-                                    (short) (y + plotY),
-                                    (short) (z + shift + oddshift + centerShiftZ),
-                                    id,
-                                    false,
-                                    h3
-                            );
-                        }
+                        schem3PopulationNeeded |= id.hasNbtData();
+                        addOverlayBlock(
+                                (short) (x + shift + oddshift + centerShiftX),
+                                (short) (y + plotY),
+                                (short) (z + shift + oddshift + centerShiftZ),
+                                id,
+                                false,
+                                maxSchematicHeight
+                        );
                     }
                     if (blockArrayClipboard3.hasBiomes()) {
                         BiomeType biome = blockArrayClipboard3.getBiome(BlockVector2.at(
@@ -397,18 +422,23 @@ public class HybridPlotWorld extends ClassicPlotWorld {
                             y + min.getBlockY(),
                             z + min.getBlockZ()
                     ));
-                    if (!id.getBlockType().getMaterial().isAir()) {
-                        schem1PopulationNeeded |= id.hasNbtData();
-                        addOverlayBlock((short) (x - shift), (short) (y + roadY), (short) (z + shift + oddshift), id, false, h1);
-                        addOverlayBlock(
-                                (short) (z + shift + oddshift),
-                                (short) (y + roadY),
-                                (short) (shift - x + (oddshift - 1)),
-                                id,
-                                true,
-                                h1
-                        );
-                    }
+                    schem1PopulationNeeded |= id.hasNbtData();
+                    addOverlayBlock(
+                            (short) (x - shift),
+                            (short) (y + roadY),
+                            (short) (z + shift + oddshift),
+                            id,
+                            false,
+                            maxSchematicHeight
+                    );
+                    addOverlayBlock(
+                            (short) (z + shift + oddshift),
+                            (short) (y + roadY),
+                            (short) (shift - x + (oddshift - 1)),
+                            id,
+                            true,
+                            maxSchematicHeight
+                    );
                 }
                 if (blockArrayClipboard1.hasBiomes()) {
                     BiomeType biome = blockArrayClipboard1.getBiome(BlockVector2.at(x + min.getBlockX(), z + min.getBlockZ()));
@@ -436,10 +466,15 @@ public class HybridPlotWorld extends ClassicPlotWorld {
                             y + min.getBlockY(),
                             z + min.getBlockZ()
                     ));
-                    if (!id.getBlockType().getMaterial().isAir()) {
-                        schem2PopulationNeeded |= id.hasNbtData();
-                        addOverlayBlock((short) (x - shift), (short) (y + roadY), (short) (z - shift), id, false, h2);
-                    }
+                    schem2PopulationNeeded |= id.hasNbtData();
+                    addOverlayBlock(
+                            (short) (x - shift),
+                            (short) (y + roadY),
+                            (short) (z - shift),
+                            id,
+                            false,
+                            maxSchematicHeight
+                    );
                 }
                 if (blockArrayClipboard2.hasBiomes()) {
                     BiomeType biome = blockArrayClipboard2.getBiome(BlockVector2.at(x + min.getBlockX(), z + min.getBlockZ()));
@@ -449,6 +484,10 @@ public class HybridPlotWorld extends ClassicPlotWorld {
         }
     }
 
+    /**
+     * @deprecated This method should not be available for public API usage and will be made private.
+     */
+    @Deprecated(forRemoval = true, since = "TODO")
     public void addOverlayBlock(short x, short y, short z, BaseBlock id, boolean rotate, int height) {
         if (z < 0) {
             z += this.SIZE;
@@ -475,6 +514,10 @@ public class HybridPlotWorld extends ClassicPlotWorld {
         existing[y] = id;
     }
 
+    /**
+     * @deprecated This method should not be available for public API usage and will be made private.
+     */
+    @Deprecated(forRemoval = true, since = "TODO")
     public void addOverlayBiome(short x, short z, BiomeType id) {
         if (z < 0) {
             z += this.SIZE;