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package com.nedap.archie.rules.evaluation;

import java.util.ArrayList;
import java.util.List;

/**
 * A single value as a result from Rule Evaluation. Also contains apath-expressions of all model references that resulted in this value.
 * The apath-expressions are guaranteed to result in one element in the reference model, if evaluated.
 *
 * The result of an evaluation is ValueList instead of this, because a single path in rules can result in multiple values in an RM object.
 *
 * Created by pieter.bos on 07/04/16.
 */
public class Value {
    private Type value;
    private List paths;//instead we could use Locatable, but for some reason datavalues are not locatable and not pathable, so hard to use here.

    public Value(Type value) {
        this.value = value;
        this.paths = new ArrayList<>();
    }

    public Value(Type value, List paths) {
        this.value = value;
        this.paths = paths;
    }

    public Type getValue() {
        return value;
    }

    public void setValue(Type value) {
        this.value = value;
    }

    /**
     * Get the paths used to evaluate this result
     * @return
     */
    public List getPaths() {
        return paths;
    }

    public void setPaths(List paths) {
        this.paths = paths;
    }

    public String toString() {
        return (value == null ? "" : value.toString()) + " from " + paths;
    }

    public boolean isNull() {
        return value == null;
    }

    public static Value createNull(List paths) {
        return new Value<>(null, paths);
    }

}