added general Suggest class

src/Suggest/Suggest.php

+<?php
+
+/*
+ * This file is part of the ONGR package.
+ *
+ * (c) NFQ Technologies UAB <info@nfq.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace ONGR\ElasticsearchDSL\Suggest;
+
+use ONGR\ElasticsearchDSL\BuilderInterface;
+use ONGR\ElasticsearchDSL\ParametersTrait;
+use Symfony\Component\Serializer\Exception\InvalidArgumentException;
+
+class Suggest implements BuilderInterface
+{
+    use ParametersTrait;
+
+    const TERM = 'term';
+    const COMPLETION = 'completion';
+    const PHRASE = 'phrase';
+    const CONTEXT = 'completion';
+
+    /**
+     * @var string
+     */
+    private $name;
+
+    /**
+     * @var string
+     */
+    private $type;
+
+    /**
+     * @var string
+     */
+    private $field;
+
+    /**
+     * @var string
+     */
+    private $text;
+
+    /**
+     * TermSuggest constructor.
+     * @param string $name
+     * @param string $field
+     * @param string $type
+     * @param string $text
+     * @param array $parameters
+     */
+    public function __construct($name, $field, $type, $text, $parameters = [])
+    {
+        $this->setName($name);
+        $this->validateType($type);
+        $this->setField($field);
+        $this->setType($type);
+        $this->setText($text);
+        $this->setParameters($parameters);
+    }
+
+    /**
+     * Returns element type.
+     *
+     * @return string
+     */
+    public function getType()
+    {
+        return $this->type;
+    }
+
+    /**
+     * @param string $type
+     */
+    public function setType($type)
+    {
+        $this->type = $type;
+    }
+
+    /**
+     * @return string
+     */
+    public function getText()
+    {
+        return $this->text;
+    }
+
+    /**
+     * @param string $text
+     */
+    public function setText($text)
+    {
+        $this->text = $text;
+    }
+
+    /**
+     * @return string
+     */
+    public function getField()
+    {
+        return $this->field;
+    }
+
+    /**
+     * @param string $field
+     */
+    public function setField($field)
+    {
+        $this->field = $field;
+    }
+
+    /**
+     * @param string $name
+     */
+    public function setName($name)
+    {
+        $this->name = $name;
+    }
+
+    /**
+     * Returns suggest name
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * Checks if the type is valid
+     *
+     * @param string $type
+     *
+     * @return bool
+     *
+     * @throws InvalidArgumentException
+     */
+    private function validateType($type)
+    {
+        if (in_array($type, [
+            self::COMPLETION,
+            self::CONTEXT,
+            self::PHRASE,
+            self::TERM
+        ])) {
+            return true;
+        }
+        throw new InvalidArgumentException(
+            'You must provide a valid type to the Suggest()'
+        );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function toArray()
+    {
+        $output = [
+            $this->getName() => [
+                'text' => $this->getText(),
+                $this->getType() => $this->processArray(['field' => $this->getField()]),
+            ]
+        ];
+
+        return $output;
+    }
+}