vxquery-core/src/main/java/org/apache/vxquery/datamodel/accessors/ArrayBackedValueStoragePool.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.vxquery.datamodel.accessors;

import org.apache.hyracks.data.std.util.ArrayBackedValueStorage;

import java.util.ArrayList;
import java.util.List;

public class ArrayBackedValueStoragePool {
    private final List<ArrayBackedValueStorage> abvsList;

    public ArrayBackedValueStoragePool() {
        abvsList = new ArrayList<>();
    }

    public ArrayBackedValueStorage takeOne() {
        if (abvsList.isEmpty()) {
            return new ArrayBackedValueStorage();
        }
        return abvsList.remove(abvsList.size() - 1);
    }

    public void giveBack(ArrayBackedValueStorage abvs) {
        abvsList.add(abvs);
    }
}