com.lithium.flow.io.InputStreamSpliterator.java Source code

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Here is the source code for com.lithium.flow.io.InputStreamSpliterator.java

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/*
 * Copyright 2015 Lithium Technologies, Inc.
 *
 * 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.lithium.flow.io;

import static com.google.common.base.Preconditions.checkNotNull;

import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.Spliterator;
import java.util.function.Consumer;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import org.apache.commons.io.LineIterator;

/**
 * @author Matt Ayres
 */
public class InputStreamSpliterator implements Spliterator<String> {
    private final LineIterator it;

    public InputStreamSpliterator(@Nonnull InputStream in, @Nonnull Charset encoding) {
        checkNotNull(in);
        checkNotNull(encoding);
        it = new LineIterator(new InputStreamReader(in, encoding));
    }

    @Override
    public boolean tryAdvance(@Nonnull Consumer<? super String> action) {
        if (it.hasNext()) {
            action.accept(it.nextLine());
            return true;
        } else {
            it.close();
            return false;
        }
    }

    @Override
    @Nullable
    public Spliterator<String> trySplit() {
        return null;
    }

    @Override
    public long estimateSize() {
        return Long.MAX_VALUE;
    }

    @Override
    public int characteristics() {
        return IMMUTABLE;
    }
}