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Wall.java

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import java.util.Arrays;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

public enum Wall {

WALL, NO_WALL("no"), DOOR, BREAKABLE, FAKE("hidden");

static final private Map<String, Wall> W_MAP = new HashMap<String, Wall>();

private List<String> aliases;

private Wall(String... aliases) {

this.aliases = Arrays.asList(aliases);

}

static {

for (Wall wall : Wall.values()) {

W_MAP.put(wall.name().toUpperCase(), wall);

for (String alias : wall.aliases)

W_MAP.put(alias.toUpperCase(), wall);

}

}

/* returns enum constant if String value matches */

static public Wall fromString(String value, int lineNum, String line) {

value = value.toUpperCase();

if (value == null)

throw new NullPointerException(

"Invalid content option \"" + value + "\". Error detected at line=" + lineNum + "(" + line + ")");

Wall wall = W_MAP.get(value);

if (wall == null)

throw new IllegalArgumentException(

"Invalid content option \"" + value + "\". Error detected at line=" + lineNum + "(" + line + ")");

return wall;

}

}