<?php

/**
 * Copyright 2010 Kousuke Ebihara
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * PHP Version 5
 *
 * @category  VersionControl
 * @package   VersionControl_Git
 * @author    Kousuke Ebihara <ebihara@php.net>
 * @copyright 2010 Kousuke Ebihara
 * @license   http://www.apache.org/licenses/LICENSE-2.0  Apache License 2.0
 */

/**
 * The base class for the all Git objects (commit, tree, blob and tag(unsupported))
 *
 * @category  VersionControl
 * @package   VersionControl_Git
 * @author    Kousuke Ebihara <ebihara@php.net>
 * @copyright 2010 Kousuke Ebihara
 * @license   http://www.apache.org/licenses/LICENSE-2.0  Apache License 2.0
 */
abstract class VersionControl_Git_Object extends VersionControl_Git_Component
{
    /**
     * The identifier of this object
     *
     * @var string
     */
    public $id;

    /**
     * The human-readable name
     *
     * @var string
     */
    protected $name;

    /**
     * Constructor
     *
     * @param VersionControl_Git $git   An instance of the VersionControl_Git
     * @param string             $id    An identifier of this object
     * @param string             $name  A human-readable name of this object
     */
    public function __construct(VersionControl_Git $git, $id = null, $name = null)
    {
        parent::__construct($git);

        $this->id = $id;
        $this->name = $name;
    }

    /**
     * Fetch the substance of this object
     *
     * Object has contents in the Git repository. But it might be large, so
     * script should fetch contents by calling this method only when necessary.
     *
     * @return VersionControl_Git_Object The "$this" object for method chain
     */
    abstract public function fetch();

    /**
     * Get a value of this instance as string
     *
     * @return string The identifier of this object
     */
    public function __toString()
    {
        return $this->id;
    }

    /**
     * Set a human-readable name of this object
     *
     * @return string The identifier of this object
     */
    public function getName()
    {
        return $this->name;
    }
}