/* This file is part of SableCC ( http://sablecc.org ).
 *
 * See the NOTICE file distributed with this work for copyright information.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.sablecc.sablecc.lrautomaton;

import java.util.*;

public abstract class Action {

    private final Map<Integer, Set<Item>> distanceToItemSetMap;

    Action(
            Map<Integer, Set<Item>> distanceToItemSetMap) {

        if (distanceToItemSetMap != null) {
            this.distanceToItemSetMap = distanceToItemSetMap;
        }
        else {
            this.distanceToItemSetMap = new LinkedHashMap<Integer, Set<Item>>();
        }
    }
}

/* This file is part of SableCC ( http://sablecc.org ).
 *
 * See the NOTICE file distributed with this work for copyright information.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.sablecc.sablecc.lrautomaton;

import java.util.*;

public abstract class Action {

    private final Map<Integer, Set<Item>> distanceToItemSetMap;

    Action(
            Map<Integer, Set<Item>> distanceToItemSetMap) {

        this.distanceToItemSetMap = distanceToItemSetMap;
    }
}

Use null as indicator for unconditional action.