kopia lustrzana https://github.com/onthegomap/planetiler
79 wiersze
2.7 KiB
Java
79 wiersze
2.7 KiB
Java
package com.onthegomap.planetiler.basemap.util;
|
|
|
|
import com.onthegomap.planetiler.util.Parse;
|
|
import java.util.Map;
|
|
|
|
/**
|
|
* Common utilities for working with data and the OpenMapTiles schema in {@code layers} implementations.
|
|
*/
|
|
public class Utils {
|
|
|
|
public static <T> T coalesce(T a, T b) {
|
|
return a != null ? a : b;
|
|
}
|
|
|
|
public static <T> T coalesce(T a, T b, T c) {
|
|
return a != null ? a : b != null ? b : c;
|
|
}
|
|
|
|
public static <T> T coalesce(T a, T b, T c, T d) {
|
|
return a != null ? a : b != null ? b : c != null ? c : d;
|
|
}
|
|
|
|
public static <T> T coalesce(T a, T b, T c, T d, T e) {
|
|
return a != null ? a : b != null ? b : c != null ? c : d != null ? d : e;
|
|
}
|
|
|
|
public static <T> T coalesce(T a, T b, T c, T d, T e, T f) {
|
|
return a != null ? a : b != null ? b : c != null ? c : d != null ? d : e != null ? e : f;
|
|
}
|
|
|
|
/** Boxes {@code a} into an {@link Integer}, or {@code null} if {@code a} is {@code nullValue}. */
|
|
public static Long nullIfLong(long a, long nullValue) {
|
|
return a == nullValue ? null : a;
|
|
}
|
|
|
|
/** Boxes {@code a} into a {@link Long}, or {@code null} if {@code a} is {@code nullValue}. */
|
|
public static Integer nullIfInt(int a, int nullValue) {
|
|
return a == nullValue ? null : a;
|
|
}
|
|
|
|
/** Returns {@code a}, or null if {@code a} is "". */
|
|
public static String nullIfEmpty(String a) {
|
|
return (a == null || a.isEmpty()) ? null : a;
|
|
}
|
|
|
|
/** Returns true if {@code a} is null, or its {@link Object#toString()} value is "". */
|
|
public static boolean nullOrEmpty(Object a) {
|
|
return a == null || a.toString().isEmpty();
|
|
}
|
|
|
|
/** Returns a map with {@code ele} (meters) and {ele_ft} attributes from an elevation in meters. */
|
|
public static Map<String, Object> elevationTags(double meters) {
|
|
return Map.of(
|
|
"ele", (int) Math.round(meters),
|
|
"ele_ft", (int) Math.round(meters * 3.2808399)
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Returns a map with {@code ele} (meters) and {ele_ft} attributes from an elevation string in meters, if {@code
|
|
* meters} can be parsed as a valid number.
|
|
*/
|
|
public static Map<String, Object> elevationTags(String meters) {
|
|
Double ele = Parse.meters(meters);
|
|
return ele == null ? Map.of() : elevationTags(ele);
|
|
}
|
|
|
|
/** Returns "bridge" or "tunnel" string used for "brunnel" attribute by OpenMapTiles schema. */
|
|
public static String brunnel(boolean isBridge, boolean isTunnel) {
|
|
return brunnel(isBridge, isTunnel, false);
|
|
}
|
|
|
|
/** Returns "bridge" or "tunnel" or "ford" string used for "brunnel" attribute by OpenMapTiles schema. */
|
|
public static String brunnel(boolean isBridge, boolean isTunnel, boolean isFord) {
|
|
return isBridge ? "bridge" : isTunnel ? "tunnel" : isFord ? "ford" : null;
|
|
}
|
|
|
|
}
|