copying.java

java 的源代码

package com.reddragon2046.base.utilities.data.algorithms;

import com.reddragon2046.base.utilities.data.*;
import com.reddragon2046.base.utilities.data.util.InsertIterator;
import com.reddragon2046.base.utilities.data.util.IteratorFactory;
import java.util.Collection;
import java.util.Iterator;

public final class Copying
{

    private Copying()
    {
    }

    protected static OutputIterator copy(InputIterator first, InputIterator last, OutputIterator result)
    {
        if(!first.isCompatibleWith(last))
            throw new IllegalArgumentException("iterators not compatible");
        InputIterator firstx = (InputIterator)first.clone();
        OutputIterator resultx = (OutputIterator)result.clone();
        for(; !firstx.equals(last); resultx.advance())
            resultx.put(firstx.next());

        return resultx;
    }

    public static OutputIterator copy(Collection input, OutputIterator result)
    {
        return copy(IteratorFactory.start(input), IteratorFactory.finish(input), result);
    }

    public static void copy(Collection source, Collection destination)
    {
        copy(IteratorFactory.start(source), IteratorFactory.finish(source), ((OutputIterator) (new InsertIterator(destination))));
    }

    public static OutputIterator copyBackward(BidirectionalIterator first, BidirectionalIterator last, BidirectionalIterator result)
    {
        if(!first.isCompatibleWith(last))
            throw new IllegalArgumentException("iterators not compatible");
        BidirectionalIterator lastx = (BidirectionalIterator)last.clone();
        BidirectionalIterator resultx = (BidirectionalIterator)result.clone();
        for(; !lastx.equals(first); resultx.put(lastx.get()))
        {
            resultx.retreat();
            lastx.retreat();
        }

        return resultx;
    }
}