ListFilesVisitor.java

/*
 * Copyright (c) 2017, Stein Eldar Johnsen
 *
 * 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 net.morimekta.file.internal;

import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.FileVisitor;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.function.Consumer;

import static java.util.Objects.requireNonNull;

public class ListFilesVisitor implements FileVisitor<Path> {
    private final Path       pathToList;
    private final boolean       recursive;
    private final Consumer<Path> all;

    public ListFilesVisitor(Path pathToList, boolean recursive, Consumer<Path> consumer) {
        requireNonNull(pathToList, "pathToList == null");
        this.pathToList = pathToList;
        this.recursive = recursive;
        this.all = consumer;
    }

    @Override
    public FileVisitResult preVisitDirectory(Path path, BasicFileAttributes basicFileAttributes) {
        if (pathToList.equals(path)) {
            return FileVisitResult.CONTINUE;
        }

        // If the directory is a symlink, skip subtree.
        if (basicFileAttributes.isSymbolicLink() || !recursive) {
            all.accept(path);
            return FileVisitResult.SKIP_SUBTREE;
        }
        return FileVisitResult.CONTINUE;
    }

    @Override
    public FileVisitResult visitFile(Path path, BasicFileAttributes basicFileAttributes) {
        all.accept(path);
        return FileVisitResult.CONTINUE;
    }

    @Override
    public FileVisitResult visitFileFailed(Path path, IOException e) {
        return FileVisitResult.TERMINATE;
    }

    @Override
    public FileVisitResult postVisitDirectory(Path path, IOException e) {
        if (e != null) {
            return FileVisitResult.TERMINATE;
        }
        return FileVisitResult.CONTINUE;
    }
}