<?php

/**
 * class VariableValueTree
 * See parent class for closer information.
 * Instances of this class are used in the Value Tree.
 */
class VariableValueTree extends Composite {
    /**
     * Reference to the Variable in InformationTree
     */
    private $variableInformation;

    public function __construct($variableInformation = null) {
        $this->variableInformation = $variableInformation;
    }

    public function testPos($pos) {
        throw new Exception(__CLASS__ . " has no positions.");
    }

    public function testPosInChildren($pos) {
        try {
            $this->getChildByPos($pos);
        }
        catch(Exception $e) {
            return false;
        }
        return true;
    }

    public function getPos() {
        return $this->parent->getPos();
    }

    public function getChildByPos($pos) {
        foreach($this->children as $child) {
            if($child instanceof VariableIndex && $child->getPos() == $pos)
                return $child;
        }
        throw new Exception("No child with position '$pos' found.");
    }

    public function getChildByName($name) {
        foreach($this->children as $child) {
            if($child instanceof VariableIndex)
                return $child->getChildByName($name);
            elseif($child instanceof VariableValueTree && $child->getName() == $name)
                return $child;
        }
        throw new Exception("No child with name '$name' found.");
    }

    public function getName() {
        if($this->variableInformation instanceof VariableInformationTree)
            return $this->variableInformation->getName();
    }

    public function testName($name) {
        $this->variableInformation->getName() == $name;
    }

    public function testNameInChildren($name) {
        try {
            $this->getChildByName($name);
        }
        catch(Exception $e) {
            return false;
        }
        return true;
    }

    public function accept(Visitor $visitor, $level = 1) {
        $visitor->visit($this, $level++);
        foreach($this->children as $child) {
            $child->accept($visitor, $level);
        }
        $visitor->removeLastVariablePart();
    } // end of member function accept
} // end of VariableValueTree

?>