PlotSquared: Set the border of a plot.

psbordersetold.java

// 1.12.2 and lower
type -> Material
id -> SubID
Plot#setComponent("border", com.intellectualcrafters.plot.config.Configuration.BLOCKLIST.parseString(type.toString() + ":" + id));

// 1.13.2 and higher
type -> Material
Plot#setComponent("border", com.intellectualcrafters.plot.config.Configuration.BLOCKLIST.parseString(type.toString()));

psbordersetplayeoldr.java

// Set the border of the plot below the player.
// com.intellectualcrafters -> PlotAPI plotApi;
// Player musst be on a Plot! Otherwise : NullPointerException

PlotAPI plotApi = ...;

// 1.12.2 and lower
private void setBorder(Player player, Material type, short id) {
	if (plotApi.getPlot(player).getConnectedPlots().size() > 1) {
		for (Plot plot : plotApi.getPlot(player).getConnectedPlots()) {
			plot.setComponent("border", com.intellectualcrafters.plot.config.Configuration.BLOCKLIST.parseString(type.toString() + ":" + id));
		}
	} else {
		plotApi.getPlot(player).setComponent("border", com.intellectualcrafters.plot.config.Configuration.BLOCKLIST.parseString(type.toString() + ":" + id));
	}
}
  
  // 1.13.2 and higher
private void setBorder(Player player, Material type) {
	if (plotApi.getPlot(player).getConnectedPlots().size() > 1) {
		for (Plot plot : plotApi.getPlot(player).getConnectedPlots()) {
			plot.setComponent("border", com.intellectualcrafters.plot.config.Configuration.BLOCKLIST.parseString(type.toString()));
		}
	} else {
		plotApi.getPlot(player).setComponent("border", com.intellectualcrafters.plot.config.Configuration.BLOCKLIST.parseString(type.toString()));
	}
}

This works only with the old API.