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The module for FunctionalJ Core.

There is a newer version: 1.0.17

// ============================================================================
// Copyright (c) 2017-2021 Nawapunth Manusitthipol (NawaMan - http://nawaman.net).
// ----------------------------------------------------------------------------
// MIT License
//
// 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 functionalj.stream.longstream;

import java.util.function.LongSupplier;

import functionalj.functions.ThrowFuncs;
import functionalj.result.NoMoreResultException;

public class LongSupplierBackedIterator implements LongIteratorPlus {
    
    /** Throw a no more element exception. This is used for generator. */
    public static  D noMoreElement() throws NoMoreResultException {
        ThrowFuncs.doThrowFrom(() -> new NoMoreResultException());
        return (D) null;
    }
    
    private final LongSupplier supplier;
    private volatile long      next;
    
    public LongSupplierBackedIterator(LongSupplier supplier) {
        this.supplier = supplier;
    }
    
    @Override
    public boolean hasNext() {
        try {
            next = supplier.getAsLong();
            return true;
        } catch (NoMoreResultException e) {
            return false;
        }
    }
    
    @Override
    public long nextLong() {
        return next;
    }
    
    @Override
    public OfLong asIterator() {
        return this;
    }
    
}