documentation/src/main/java/org/apache/geronimo/arthur/documentation/io/FolderVisitor.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.geronimo.arthur.documentation.io;

import static java.util.Objects.requireNonNull;

import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.function.Consumer;
import java.util.function.Predicate;

import org.apache.geronimo.arthur.documentation.lang.PathPredicates;

import lombok.RequiredArgsConstructor;

@RequiredArgsConstructor
public class FolderVisitor {
    private final PathPredicates predicates;

    public void visit(final FolderConfiguration configuration,
                      final Consumer<Path> consumer) {
        final Path root = requireNonNull(configuration.getLocation(), "Missing location");
        if (Files.exists(root)) {
            final Predicate<Path> filter = predicates.createFilter(configuration.getIncludes(), configuration.getExcludes());
            try {
                Files.walkFileTree(root, new SimpleFileVisitor<Path>() {
                    @Override
                    public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {
                        if (filter.test(root.relativize(file))) {
                            consumer.accept(file);
                        }
                        return super.visitFile(file, attrs);
                    }
                });
            } catch (final IOException e) {
                throw new IllegalStateException(e);
            }
        }
    }
}