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Editing File: /home/ubuntu/code_review/arcanist/src/difference/ArcanistDiffVectorNode.php

<?php

final class ArcanistDiffVectorNode
  extends Phobject {

private $vector;
  private $children = array();
  private $parentNode;
  private $displayNode;
  private $displayVector;
  private $displayDepth;
  private $valueNode;
  private $attributes = array();

public function setVector(array $vector) {
    $this->vector = $vector;
    return $this;
  }

public function getVector() {
    return $this->vector;
  }

public function getChildren() {
    return $this->children;
  }

public function setParentNode(ArcanistDiffVectorNode $parent) {
    $this->parentNode = $parent;
    return $this;
  }

public function getParentNode() {
    return $this->parentNode;
  }

public function addChild(array $vector, $length, $idx) {
    $is_node = ($idx === ($length - 1));
    $element = $vector[$idx];

if (!isset($this->children[$element])) {
      $this->children[$element] = id(new self())
        ->setParentNode($this)
        ->setVector(array_slice($vector, 0, $idx + 1));
    }

$child = $this->children[$element];

if ($is_node) {
      $child->setValueNode($child);
      return;
    }

$child->addChild($vector, $length, $idx + 1);
  }

public function getDisplayVector() {
    return $this->displayVector;
  }

public function appendDisplayElement($element) {
    if ($this->displayVector === null) {
      $this->displayVector = array();
    }

$this->displayVector[] = $element;

return $this;
  }

public function setDisplayNode(ArcanistDiffVectorNode $display_node) {
    $this->displayNode = $display_node;
    return $this;
  }

public function getDisplayNode() {
    return $this->displayNode;
  }

public function setDisplayDepth($display_depth) {
    $this->displayDepth = $display_depth;
    return $this;
  }

public function getDisplayDepth() {
    return $this->displayDepth;
  }

public function setValueNode($value_node) {
    $this->valueNode = $value_node;
    return $this;
  }

public function getValueNode() {
    return $this->valueNode;
  }

public function setAncestralAttribute($key, $value) {
    $this->attributes[$key] = $value;

$parent = $this->getParentNode();
    if ($parent) {
      $parent->setAncestralAttribute($key, $value);
    }

return $this;
  }

public function getAttribute($key, $default = null) {
    return idx($this->attributes, $key, $default);
  }

}

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