source: src/main/java/genius/gui/panels/BooleanModel.java

package genius.gui.panels;

import genius.core.listener.DefaultListenable;

/**
 * Stores a listen-able boolean value. Listeners always hear the current value,
 * not the lock setting.
 *
 */
public class BooleanModel extends DefaultListenable<Boolean>
                implements Lockable {
        private boolean value = false;
        private boolean lock = false;

        /**
         * 
         * @param b
         *            the initial value for the boolean
         */
        public BooleanModel(boolean b) {
                this.value = b;
        }

        /**
         * @param newValue
         *            the new value. Check {@link #isLocked()} before attempting
         *            this
         * @throws IllegalStateException
         *             if object is locked.
         */
        public void setValue(boolean newValue) {
                if (lock) {
                        throw new IllegalStateException("Value is locked");
                }
                if (value != newValue) {
                        value = newValue;
                        notifyChange(value);
                }
        }

        public boolean getValue() {
                return value;
        }

        /**
         * 
         * @param isLock
         *            if true, the value can not be changed. The GUI should also
         *            reflect this setting eg by greying out the item.
         */
        @Override
        public void setLock(boolean isLock) {
                lock = isLock;
                notifyChange(value);
        }

        /**
         * @return true if the value is locked and can't be changed.
         */
        @Override
        public boolean isLocked() {
                return lock;
        }
}