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/*
 * Copyright 2018 mayabot.com authors. All rights reserved.
 *
 * 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.mayabot.nlp.common;

import com.google.common.collect.AbstractIterator;

import java.util.Iterator;

/**
 * ParagraphReader包装成iterable对象
 *
 * @author jimichan
 */
public class ParagraphIteratable implements Iterable {

    private ParagraphReader reader;

    public ParagraphIteratable(ParagraphReader reader) {
        this.reader = reader;
    }

    @Override
    public Iterator iterator() {

        return new AbstractIterator() {

            @Override
            protected String computeNext() {
                try {
                    String next = reader.next();
                    if (next == null) {
                        return endOfData();
                    }
                    return next;
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }
            }
        };
    }
}