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<?php
/**
 * This file is part of PDepend.
 *
 * PHP Version 5
 *
 * Copyright (c) 2008-2017 Manuel Pichler <[email protected]>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *
 *   * Neither the name of Manuel Pichler nor the names of his
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * @copyright 2008-2017 Manuel Pichler. All rights reserved.
 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 *
 * @since 0.9.6
 */

namespace PDepend\Source\AST;

use InvalidArgumentException;
use OutOfBoundsException;
use PDepend\Source\ASTVisitor\ASTVisitor;

/**
 * This class represents a field or property declaration of a class.
 *
 * <code>
 * // Simple field declaration
 * class Foo {
 *     protected $foo;
 * }
 *
 * // Field declaration with multiple properties
 * class Foo {
 *     protected $foo = 23
 *               $bar = 42,
 *               $baz = null;
 * }
 * </code>
 *
 * @copyright 2008-2017 Manuel Pichler. All rights reserved.
 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 *
 * @since 0.9.6
 */
class ASTFieldDeclaration extends AbstractASTNode
{
    /**
     * Checks if this parameter has a type.
     *
     * @return bool
     */
    public function hasType()
    {
        return (reset($this->nodes) instanceof ASTType);
    }

    /**
     * Returns the type of this parameter.
     *
     * @return ASTType
     */
    public function getType()
    {
        $child = $this->getChild(0);
        if ($child instanceof ASTType) {
            return $child;
        }

        throw new OutOfBoundsException('The parameter does not have a type specification.');
    }

    /**
     * This method returns a OR combined integer of the declared modifiers for
     * this property.
     *
     * @return int
     */
    public function getModifiers()
    {
        return $this->getMetadataInteger(5);
    }

    /**
     * This method sets a OR combined integer of the declared modifiers for this
     * node.
     *
     * This method will throw an exception when the value of given <b>$modifiers</b>
     * contains an invalid/unexpected modifier
     *
     * @param int $modifiers The declared modifiers for this node.
     *
     * @throws InvalidArgumentException If the given modifier contains unexpected values.
     *
     * @return void
     */
    public function setModifiers($modifiers)
    {
        $expected = ~State::IS_PUBLIC
                  & ~State::IS_PROTECTED
                  & ~State::IS_PRIVATE
                  & ~State::IS_STATIC
                  & ~State::IS_READONLY;

        if (($expected & $modifiers) !== 0) {
            throw new InvalidArgumentException(
                'Invalid field modifiers given, allowed modifiers are ' .
                'IS_PUBLIC, IS_PROTECTED, IS_PRIVATE and IS_STATIC.'
            );
        }

        $this->setMetadataInteger(5, $modifiers);
    }

    /**
     * Returns <b>true</b> if this node is marked as public, otherwise the
     * returned value will be <b>false</b>.
     *
     * @return bool
     */
    public function isPublic()
    {
        return (($this->getModifiers() & State::IS_PUBLIC) === State::IS_PUBLIC);
    }

    /**
     * Returns <b>true</b> if this node is marked as protected, otherwise the
     * returned value will be <b>false</b>.
     *
     * @return bool
     */
    public function isProtected()
    {
        return (($this->getModifiers() & State::IS_PROTECTED) === State::IS_PROTECTED);
    }

    /**
     * Returns <b>true</b> if this node is marked as private, otherwise the
     * returned value will be <b>false</b>.
     *
     * @return bool
     */
    public function isPrivate()
    {
        return (($this->getModifiers() & State::IS_PRIVATE) === State::IS_PRIVATE);
    }

    /**
     * Returns <b>true</b> when this node is declared as static, otherwise
     * the returned value will be <b>false</b>.
     *
     * @return bool
     */
    public function isStatic()
    {
        return (($this->getModifiers() & State::IS_STATIC) === State::IS_STATIC);
    }

    /**
     * Returns the total number of the used property bag.
     *
     * @return int
     *
     * @since  0.10.4
     * @see    ASTNode#getMetadataSize()
     */
    protected function getMetadataSize()
    {
        return 6;
    }
}