pw.swordfish.validation.DirectoryValidator.java Source code

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Here is the source code for pw.swordfish.validation.DirectoryValidator.java

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/*
 * Copyright (C) 2013 Brandon Koepke
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package pw.swordfish.validation;

import com.google.common.base.Optional;
import com.google.common.collect.ImmutableSet;
import java.io.File;
import java.io.IOException;
import java.nio.file.AccessDeniedException;
import java.nio.file.Files;
import java.nio.file.NotDirectoryException;
import java.nio.file.Path;

class DirectoryValidator implements Validator<File> {
    private class DirectoryConstraintValidation implements ConstraintViolation<File> {
        private final File _invalidValue;
        private final String _message;
        private final Exception _error;

        public DirectoryConstraintValidation(File invalidValue, String message, Exception error) {
            _invalidValue = invalidValue;
            _message = message;
            _error = error;
        }

        @Override
        public File getInvalidValue() {
            return _invalidValue;
        }

        @Override
        public String getMessage() {
            return _message;
        }

        @Override
        public Optional<Exception> getError() {
            return Optional.of(_error);
        }
    }

    private ImmutableSet<ConstraintViolation<File>> getValidationsSet(File file) {
        ImmutableSet.Builder<ConstraintViolation<File>> constraintBuilder = ImmutableSet.builder();
        Path path = file.toPath();
        if (!Files.exists(path)) {
            constraintBuilder.add(new DirectoryConstraintValidation(file,
                    "Directory doesn't exist " + path.toString(), new IOException(path.toString())));
            return constraintBuilder.build();
        }
        if (!Files.isDirectory(path)) {
            constraintBuilder.add(new DirectoryConstraintValidation(file, "Not a directory " + path.toString(),
                    new NotDirectoryException(path.toString())));
        }
        if (!Files.isReadable(path)) {
            constraintBuilder.add(new DirectoryConstraintValidation(file, "Access denied " + path.toString(),
                    new AccessDeniedException(path.toString())));
        }
        return constraintBuilder.build();
    }

    @Override
    public Violations<File> validate(File file) {
        return Violations.of(getValidationsSet(file));
    }
}