tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/onenote/CheckedFileNodePushBack.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.tika.parser.microsoft.onenote;

/**
 * Provides a way to add a new element on the fileNode list, but remove it from the list if
 * we end up not committing it.
 */
class CheckedFileNodePushBack {
    FileNodeList fileNodeList;
    boolean committed;

    public CheckedFileNodePushBack(FileNodeList fileNodeList) {
        committed = true;
        this.fileNodeList = fileNodeList;
        fileNodeList.children.add(new FileNode());
        committed = false;
    }

    public void commit() {
        committed = true;
    }

    public void popBackIfNotCommitted() {
        if (!committed) {
            fileNodeList.children.remove(fileNodeList.children.size() - 1);
        }
    }
}