package freemarker.template;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
public class EmptyMap implements Map, Cloneable {
public static final EmptyMap instance = new EmptyMap();
public void clear() {
throw new UnsupportedOperationException("This Map is read-only.");
}
public boolean containsKey(Object arg0) {
return false;
}
public boolean containsValue(Object arg0) {
return false;
}
public Set entrySet() {
return Collections.EMPTY_SET;
}
public Object get(Object arg0) {
return null;
}
public boolean isEmpty() {
return true;
}
public Set keySet() {
return Collections.EMPTY_SET;
}
public Object put(Object arg0, Object arg1) {
throw new UnsupportedOperationException("This Map is read-only.");
}
public void putAll(Map arg0) {
throw new UnsupportedOperationException("This Map is read-only.");
}
public Object remove(Object arg0) {
throw new UnsupportedOperationException("This Map is read-only.");
}
public int size() {
return 0;
}
public Collection values() {
return Collections.EMPTY_LIST;
}
}
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