commons-vfs2/src/main/java/org/apache/commons/vfs2/FileDepthSelector.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.commons.vfs2;

import org.apache.commons.lang3.Range;

/**
 * A {@link FileSelector} that selects all files in a particular depth range.
 */
public class FileDepthSelector implements FileSelector {

    private final Range<Integer> range;

    /**
     * Creates a selector with the given minimum and maximum depths.
     *
     * @param minDepth minimum depth
     * @param maxDepth maximum depth
     */
    public FileDepthSelector(final int minDepth, final int maxDepth) {
        this.range = Range.between(minDepth, maxDepth);
    }

    /**
     * Creates a selector with the same minimum and maximum depths.
     *
     * @param minMaxDepth minimum and maximum depth
     * @since 2.1
     */
    public FileDepthSelector(final int minMaxDepth) {
        this(minMaxDepth, minMaxDepth);
    }

    /**
     * Creates a selector with the same minimum and maximum depths of 0.
     *
     * @since 2.1
     */
    public FileDepthSelector() {
        this(0, 0);
    }

    /**
     * Determines if a file or folder should be selected.
     *
     * @param fileInfo The file selection information
     * @return true if the file or folder should be included, false otherwise.
     */
    @Override
    public boolean includeFile(final FileSelectInfo fileInfo) throws Exception {
        return range.contains(fileInfo.getDepth());
    }

    /**
     * Determines whether a folder should be traversed.
     *
     * @param fileInfo The file selection information
     * @return true if the file or folder should be traversed, false otherwise.
     */
    @Override
    public boolean traverseDescendents(final FileSelectInfo fileInfo) throws Exception {
        return fileInfo.getDepth() < range.getMaximum();
    }
}