added new condition: BlockFree

src/main/java/de/srsoftware/web4rail/conditions/BlockFree.java

@@ -0,0 +1,61 @@
+package de.srsoftware.web4rail.conditions;
+
+import java.util.HashMap;
+
+import org.json.JSONObject;
+
+import de.srsoftware.tools.Tag;
+import de.srsoftware.web4rail.actions.Action.Context;
+import de.srsoftware.web4rail.tags.Label;
+import de.srsoftware.web4rail.tiles.Block;
+
+public class BlockFree extends Condition {
+	
+	private static final String BLOCK = Block.class.getSimpleName();
+	private Block block;
+
+	@Override
+	public boolean fulfilledBy(Context context) {
+		return block.isFreeFor(null) != inverted;
+	}
+	
+	@Override
+	public JSONObject json() {
+		return super.json().put(BLOCK, block.id());
+	}
+	
+	public Condition load(JSONObject json) {
+		super.load(json);
+		block(Block.get(json.getString(BLOCK)));
+		return this;
+	}
+	
+	@Override
+	public Tag propForm(HashMap<String, String> params) {
+		Tag form = super.propForm(params);
+		Block.selector(block, null).addTo(new Label(t("Select block:")+NBSP)).addTo(form);
+		return form;
+	}
+
+	@Override
+	public String toString() {
+		if (block == null) return t("[Click here to select block!]");
+		return t(inverted ? "Block {} is occupied":"Block {} is free",block);
+	}
+	
+	private BlockFree block(Block block) {
+		this.block = block;
+		return this;
+	}
+
+
+	@Override
+	protected Object update(HashMap<String, String> params) {
+		if (!params.containsKey(BLOCK)) return t("No block id passed to BlockFree.update()!");
+		String bid = params.get(BLOCK);
+		Block block = Block.get(bid);
+		if (block == null) return t("No block with id {} found!",bid);
+		this.block = block;
+		return super.update(params);
+	}
+}

src/main/java/de/srsoftware/web4rail/conditions/Condition.java

@@ -88,6 +88,7 @@ public abstract class Condition extends BaseClass {
 	
 	private static List<Class<? extends Condition>> list() {
 		return List.of(
+				BlockFree.class,
 				PushPullTrain.class,
 				TrainHasTag.class,
 				TrainSelect.class,