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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.flink.cep.pattern;

import org.apache.flink.cep.nfa.aftermatch.AfterMatchSkipStrategy;
import org.apache.flink.cep.pattern.conditions.IterativeCondition;

/**
 * Base class for a group pattern definition.
 *
 * @param  Base type of the elements appearing in the pattern
 * @param  Subtype of T to which the current pattern operator is constrained
 */
public class GroupPattern extends Pattern {

    /** Group pattern representing the pattern definition of this group. */
    private final Pattern groupPattern;

    GroupPattern(
            final Pattern previous,
            final Pattern groupPattern,
            final Quantifier.ConsumingStrategy consumingStrategy,
            final AfterMatchSkipStrategy afterMatchSkipStrategy) {
        super("GroupPattern", previous, consumingStrategy, afterMatchSkipStrategy);
        this.groupPattern = groupPattern;
    }

    @Override
    public Pattern where(IterativeCondition condition) {
        throw new UnsupportedOperationException("GroupPattern does not support where clause.");
    }

    @Override
    public Pattern or(IterativeCondition condition) {
        throw new UnsupportedOperationException("GroupPattern does not support or clause.");
    }

    @Override
    public  Pattern subtype(final Class subtypeClass) {
        throw new UnsupportedOperationException("GroupPattern does not support subtype clause.");
    }

    public Pattern getRawPattern() {
        return groupPattern;
    }
}