com.github.blacklocus.rdsecho.utl.PagingIterable.java Source code

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Here is the source code for com.github.blacklocus.rdsecho.utl.PagingIterable.java

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/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 BlackLocus
 *
 * 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 com.github.blacklocus.rdsecho.utl;

import com.google.common.base.Supplier;
import org.apache.http.annotation.NotThreadSafe;

import java.util.Iterator;

@NotThreadSafe
class PagingIterable<T> implements Iterable<T>, Iterator<T> {

    final Supplier<Iterable<T>> supplier;
    Iterator<T> currentPage;

    public PagingIterable(Supplier<Iterable<T>> supplier) {
        this.supplier = supplier;
        this.currentPage = supplier.get().iterator();
    }

    @Override
    public Iterator<T> iterator() {
        return this;
    }

    @Override
    public boolean hasNext() {
        boolean x = currentPage.hasNext();
        return x;
    }

    @Override
    public T next() {
        T next = currentPage.next();
        if (!currentPage.hasNext()) {
            currentPage = supplier.get().iterator();
        }
        return next;
    }

    @Override
    public void remove() {
        throw new UnsupportedOperationException();
    }
}