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Pipelines Library for Java
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/*
 * @(#) Pipelines.java
 *
 * pipelines   Pipeline conversion library for Java
 * Copyright (c) 2021, 2023 Peter Wall
 *
 * 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 net.pwall.pipeline;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;

import net.pwall.util.IntOutput;

/**
 * A set of static functions for use with the {@code pipelines} library.
 *
 * @author  Peter Wall
 */
public class Pipelines {

    public static  R process(Reader reader, IntAcceptor downstream) throws IOException {
        while (true) {
            int i = reader.read();
            downstream.accept(i);
            if (i < 0)
                break;
        }
        return downstream.getResult();
    }

    public static  R process(InputStream inputStream, IntAcceptor downstream) throws IOException {
        while (true) {
            int i = inputStream.read();
            downstream.accept(i);
            if (i < 0)
                break;
        }
        return downstream.getResult();
    }

    public static  R process(File file, IntAcceptor downstream) throws IOException {
        return process(new FileInputStream(file), downstream);
    }

    public static  R process(Iterable iterable, Acceptor downstream) {
        for (A item : iterable)
            downstream.accept(item);
        downstream.safeClose();
        return downstream.getResult();
    }

    public static void acceptInt(IntAcceptor acceptor, int i) {
        IntOutput.outputInt(i, acceptor);
    }

}
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