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Pipes is a dataflow framework written in Java that enables the splitting, merging, filtering, and transformation of data from input to output. Computations are expressed using a combinator model and are evaluated in a memory-efficient, lazy fashion.

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package com.tinkerpop.pipes.transform;

import com.tinkerpop.blueprints.Element;
import com.tinkerpop.blueprints.Index;
import com.tinkerpop.pipes.IdentityPipe;

/**
 * @author Marko A. Rodriguez (http://markorodriguez.com)
 */
public class IndexElementsPipe extends IdentityPipe implements TransformPipe {

    public IndexElementsPipe(final Index index, final String key, final Object value) {
        super.setStarts(index.get(key, value).iterator());
    }
}