package org.spongepowered.api.util.file;

import static com.google.common.base.Preconditions.checkNotNull;

import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.FileVisitor;
import java.nio.file.attribute.BasicFileAttributes;

public abstract class ForwardingFileVisitor<T> implements FileVisitor<T> {

    private final FileVisitor<T> visitor;

    protected ForwardingFileVisitor(FileVisitor<T> visitor) {
        this.visitor = checkNotNull(visitor, "visitor");
    }

    @Override
    public FileVisitResult preVisitDirectory(T dir, BasicFileAttributes attrs) throws IOException {
        return this.visitor.preVisitDirectory(dir, attrs);
    }

    @Override
    public FileVisitResult visitFile(T file, BasicFileAttributes attrs) throws IOException {
        return this.visitor.visitFile(file, attrs);
    }

    @Override
    public FileVisitResult visitFileFailed(T file, IOException exc) throws IOException {
        return this.visitor.visitFileFailed(file, exc);
    }

    @Override
    public FileVisitResult postVisitDirectory(T dir, IOException exc) throws IOException {
        return this.visitor.postVisitDirectory(dir, exc);
    }

}

/*
 * This file is part of SpongeAPI, licensed under the MIT License (MIT).
 *
 * Copyright (c) SpongePowered <https://www.spongepowered.org>
 * Copyright (c) contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.spongepowered.api.util.file;

import static com.google.common.base.Preconditions.checkNotNull;

import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.FileVisitor;
import java.nio.file.attribute.BasicFileAttributes;

public abstract class ForwardingFileVisitor<T> implements FileVisitor<T> {

    private final FileVisitor<T> visitor;

    protected ForwardingFileVisitor(FileVisitor<T> visitor) {
        this.visitor = checkNotNull(visitor, "visitor");
    }

    @Override
    public FileVisitResult preVisitDirectory(T dir, BasicFileAttributes attrs) throws IOException {
        return this.visitor.preVisitDirectory(dir, attrs);
    }

    @Override
    public FileVisitResult visitFile(T file, BasicFileAttributes attrs) throws IOException {
        return this.visitor.visitFile(file, attrs);
    }

    @Override
    public FileVisitResult visitFileFailed(T file, IOException exc) throws IOException {
        return this.visitor.visitFileFailed(file, exc);
    }

    @Override
    public FileVisitResult postVisitDirectory(T dir, IOException exc) throws IOException {
        return this.visitor.postVisitDirectory(dir, exc);
    }

}

Add missing license header