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Java port of Stefan Goessner JsonPath.

There is a newer version: 2.9.0

package com.jayway.jsonpath.internal.function;

import com.jayway.jsonpath.internal.EvaluationContext;
import com.jayway.jsonpath.internal.PathRef;

/**
 * Defines the pattern by which a function can be executed over the result set in the particular path
 * being grabbed.  The Function's input is the content of the data from the json path selector and its output
 * is defined via the functions behavior.  Thus transformations in types can take place.  Additionally, functions
 * can accept multiple selectors in order to produce their output.
 *
 * Created by [email protected] on 6/26/15.
 */
public interface PathFunction {

    /**
     * Invoke the function and output a JSON object (or scalar) value which will be the result of executing the path
     *
     * @param currentPath
     *      The current path location inclusive of the function name
     * @param parent
     *      The path location above the current function
     *
     * @param model
     *      The JSON model as input to this particular function
     *
     * @param ctx
     *      Eval context, state bag used as the path is traversed, maintains the result of executing
     *
     * @return
     */
    Object invoke(String currentPath, PathRef parent, Object model, EvaluationContext ctx);
}