com.metreeca.mark.pipes.None Maven / Gradle / Ivy

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/*
 * Copyright © 2019-2023 Metreeca srl
 *
 * Licensed 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 com.metreeca.mark.pipes;

import com.metreeca.mark.*;

import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Stream;

/**
 * Leftover processing pipe.
 *
 * Identifies previously processed removed files in the {@code source} folders and removes corresponding leftover
 * files in the {@code target} folder.
 */
public final class None implements Pipe {

    private static String basename(final Path path) { // !!!

        final String filename=path.toString();
        final int dot=filename.lastIndexOf('.');

        return dot < 0 ? filename : filename.substring(0, dot);
    }


    public None(final Mark mark) {

        if ( mark == null ) {
            throw new NullPointerException("null mark");
        }

    }


    @Override public Optional process(final Path source) {
        return Optional.of(source)
                .filter(path -> !Files.exists(path))
                .map(path -> new File(path, Map.of(), (target, model) -> {
                    try ( final Stream files=Files.walk(target.getParent()) ) {

                        files.filter(file -> basename(path).equals(basename(file))).forEach(file -> {
                            try {

                                Files.delete(file);

                            } catch ( final IOException e ) {

                                throw new UncheckedIOException(e);

                            }
                        });

                    } catch ( final IOException e ) {

                        throw new UncheckedIOException(e);

                    }
                }));
    }

}