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    • com.github.basking2.sdsai.itrex.functions.JoinFunction Maven / Gradle / Ivy

    There is a newer version: 1.1.23
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    package com.github.basking2.sdsai.itrex.functions;

import com.github.basking2.sdsai.itrex.EvaluationContext;
import com.github.basking2.sdsai.itrex.SExprRuntimeException;

import java.util.Iterator;
import java.util.concurrent.Future;

import static com.github.basking2.sdsai.itrex.iterators.Iterators.mapIterator;
import static com.github.basking2.sdsai.itrex.iterators.Iterators.toIterator;

/**
 * Join any Future object from a given array.
 *
 * {@code ["join", ["thread", ["list"...]]]}
 */
public class JoinFunction implements FunctionInterface> {

    @Override
    public Iterator apply(Iterator iterator, EvaluationContext evaluationContext) {
        if (!iterator.hasNext()) {
            throw new SExprRuntimeException("Join function requires a single argument that is an iterator or iterable.");
        }

        final Iterator> objectIterator = toIterator(iterator.next());

        if (objectIterator == null) {
            throw new SExprRuntimeException("Join function could not convert its argument to an iterator.");
        }

        return mapIterator(objectIterator, e -> e.get());
    }
}
    
    
    
    

    




    
    
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