com.jillesvangurp.iterables.CSVLineIterable Maven / Gradle / Ivy

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Misc classes to make processing utf-8 content with iterators a bit less painful.

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package com.jillesvangurp.iterables;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;

import com.google.common.base.Splitter;

/**
 * Simple iterable that breaks lines into fields based on a separator.
 * Note. this class is fairly simplistic compared to solutions like open csv and doesn't support things like escaping
 * currently. Feel free to contribute patches to fix this.
 */
public class CSVLineIterable implements Iterable> {
    private final Iterable lineIterator;
    private final char delimiter;

    public CSVLineIterable(Iterable lineIterator, char delimiter) {
        this.lineIterator = lineIterator;
        this.delimiter = delimiter;
    }

    @Override
    public Iterator> iterator() {
        final Iterator iterator = lineIterator.iterator();
        return new Iterator>() {

            @Override
            public boolean hasNext() {
                return iterator.hasNext();
            }

            @Override
            public List next() {
                String line = iterator.next();
                if (line != null) {
                    List result = new ArrayList<>();
                    for (String field : Splitter.on(delimiter).trimResults().split(line)) {
                        result.add(field);
                    }
                    return result;
                } else {
                    throw new NoSuchElementException();
                }
            }

            @Override
            public void remove() {
                iterator.remove();
            }
        };
    }
}