io.github.zlika.reproducible.TextFileStripper Maven / Gradle / Ivy

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/*
 * 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 io.github.zlika.reproducible;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Predicate;

/**
 * Generic text file stripper.
 */
class TextFileStripper implements Stripper
{
    private final List> predicates = new ArrayList<>();
    
    /**
     * Adds a predicate to filter the text file.
     * @param predicate the predicate.
     * @return this.
     */
    public TextFileStripper addPredicate(Predicate predicate)
    {
        predicates.add(predicate.negate());
        return this;
    }
    
    @Override
    public void strip(File in, File out) throws IOException
    {
        try (final BufferedWriter writer = new BufferedWriter(
                new OutputStreamWriter(new FileOutputStream(out), StandardCharsets.UTF_8));
         final BufferedReader reader = new BufferedReader(
                new InputStreamReader(new FileInputStream(in), StandardCharsets.UTF_8)))
        {
            reader.lines().filter(s -> predicates.stream().allMatch(p -> p.test(s)))
                        .forEach(s ->
                        {
                            try
                            {
                                writer.write(s);
                                writer.write("\r\n");
                            }
                            catch (IOException e)
                            {
                            }
                        });
        }
    }
}