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The MyBatis SQL mapper framework makes it easier to use a relational database with object-oriented applications. MyBatis couples objects with stored procedures or SQL statements using a XML descriptor or annotations. Simplicity is the biggest advantage of the MyBatis data mapper over object relational mapping tools.

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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.ibatis.ognl;

public final class EvaluationPool {

    /**
     * Returns an Evaluation that contains the node, source and whether it
     * is a set operation.  If there are no Evaluation objects in the
     * pool one is created and returned.
     *
     * @param node   a SimpleNode for an Evaluation to be created.
     * @param source a source Object for an Evaluation to be created.
     * @return an Evaluation based on the parameters.
     */
    public Evaluation create(SimpleNode node, Object source) {
        return create(node, source, false);
    }

    /**
     * Returns an Evaluation that contains the node, source and whether it
     * is a set operation.
     *
     * @param node         a SimpleNode for an Evaluation to be created.
     * @param source       a source Object for an Evaluation to be created.
     * @param setOperation true to identify the Evaluation to be created as a set operation, false to identify it as a get operation.
     * @return an Evaluation based on the parameters.
     */
    public Evaluation create(SimpleNode node, Object source, boolean setOperation) {
        // synchronization is removed as we do not rely anymore on the in-house object pooling
        return new Evaluation(node, source, setOperation);
    }

    /**
     * Returns the number of items in the pool
     *
     * @return the size of the Evaluation pool (always 0).
     * @deprecated object-pooling now relies on the jvm garbage collection
     */
    public int getSize() {
        return 0;
    }

    /**
     * Returns the number of items this pool has created since
     * it's construction.
     *
     * @return the creation count for the Evaluation pool (always 0).
     * @deprecated object-pooling now relies on the jvm garbage collection
     */
    public int getCreatedCount() {
        return 0;
    }

    /**
     * Returns the number of items this pool has recovered from
     * the pool since its construction.
     *
     * @return the recovered count for the Evaluation pool (always 0).
     * @deprecated object-pooling now relies on the jvm garbage collection
     */
    public int getRecoveredCount() {
        return 0;
    }

    /**
     * Returns the number of items this pool has recycled since
     * it's construction.
     *
     * @return the recycled count for the Evaluation pool (always 0).
     * @deprecated object-pooling now relies on the jvm garbage collection
     */
    public int getRecycledCount() {
        return 0;
    }
}