flink-libraries/flink-table-common/src/main/java/org/apache/flink/table/api/types/MultisetType.java

/*
 * 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.table.api.types;

/**
 * Multiset type.
 */
public class MultisetType extends MapType {

	public MultisetType(DataType elementType) {
		super(elementType, Types.INT);
	}

	public DataType getElementType() {
		return getKeyType();
	}

	public InternalType getElementInternalType() {
		return getKeyType().toInternalType();
	}

	@Override
	public boolean equals(Object obj) {
		if (obj == this) {
			return true;
		} else if (obj instanceof MultisetType) {
			final MultisetType other = (MultisetType) obj;
			return getElementInternalType().equals(other.getElementInternalType());
		} else {
			return false;
		}
	}

	@Override
	public int hashCode() {
		return 31 * getElementInternalType().hashCode() + 1;
	}

	@Override
	public String toString() {
		return "Multiset<" + getElementType() + '>';
	}
}