Diff: features/FEATURE_BLE/ble/GattAttribute.h

Revision:

0:fb7af294d5d9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/features/FEATURE_BLE/ble/GattAttribute.h	Thu Nov 17 16:43:53 2016 +0000
@@ -0,0 +1,174 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * 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.
+ */
+
+#ifndef __GATT_ATTRIBUTE_H__
+#define __GATT_ATTRIBUTE_H__
+
+#include "UUID.h"
+
+/**
+ * Instances of this class encapsulate the data that belongs to a Bluetooth Low
+ * Energy attribute.
+ */
+class GattAttribute {
+public:
+    /**
+     * Type for the handle or ID of the attribute in the ATT table. These are
+     * unique and are usually generated by the underlying BLE stack.
+     */
+    typedef uint16_t Handle_t;
+    /**
+     * Define the value of an invalid attribute handle.
+     */
+    static const Handle_t INVALID_HANDLE = 0x0000;
+
+public:
+    /**
+     *  @brief  Creates a new GattAttribute using the specified
+     *          UUID, value length, and inital value.
+     *
+     *  @param[in]  uuid
+     *              The UUID to use for this attribute.
+     *  @param[in]  valuePtr
+     *              The memory holding the initial value.
+     *  @param[in]  len
+     *              The length in bytes of this attribute's value.
+     *  @param[in]  maxLen
+     *              The max length in bytes of this attribute's value.
+     *  @param[in]  hasVariableLen
+     *              Whether the attribute's value length changes overtime.
+     *
+     *  @section EXAMPLE
+     *
+     *  @code
+     *
+     *  // UUID = 0x2A19, Min length 2, Max len = 2
+     *  GattAttribute attr = GattAttribute(0x2A19, &someValue, 2, 2);
+     *
+     *  @endcode
+     */
+    GattAttribute(const UUID &uuid, uint8_t *valuePtr = NULL, uint16_t len = 0, uint16_t maxLen = 0, bool hasVariableLen = true) :
+        _uuid(uuid), _valuePtr(valuePtr), _lenMax(maxLen), _len(len), _hasVariableLen(hasVariableLen), _handle() {
+        /* Empty */
+    }
+
+public:
+    /**
+     * Get the attribute's handle in the ATT table.
+     *
+     * @return The attribute's handle.
+     */
+    Handle_t getHandle(void) const {
+        return _handle;
+    }
+
+    /**
+     * The UUID of the characteristic that this attribute belongs to.
+     *
+     * @return The characteristic's UUID.
+     */
+    const UUID &getUUID(void) const {
+        return _uuid;
+    }
+
+    /**
+     * Get the current length of the attribute value.
+     *
+     * @return The current length of the attribute value.
+     */
+    uint16_t getLength(void) const {
+        return _len;
+    }
+
+    /**
+     * Get the maximum length of the attribute value.
+     *
+     * The maximum length of the attribute value.
+     */
+    uint16_t getMaxLength(void) const {
+        return _lenMax;
+    }
+
+    /**
+     * Get a pointer to the current length of the attribute value.
+     *
+     * @return A pointer to the current length of the attribute value.
+     */
+    uint16_t *getLengthPtr(void) {
+        return &_len;
+    }
+
+    /**
+     * Set the attribute handle.
+     *
+     * @param[in] id
+     *              The new attribute handle.
+     */
+    void setHandle(Handle_t id) {
+        _handle = id;
+    }
+
+    /**
+     * Get a pointer to the attribute value.
+     *
+     * @return A pointer to the attribute value.
+     */
+    uint8_t *getValuePtr(void) {
+        return _valuePtr;
+    }
+
+    /**
+     * Check whether the length of the attribute's value can change over time.
+     *
+     * @return true if the attribute has variable length, false otherwise.
+     */
+    bool hasVariableLength(void) const {
+        return _hasVariableLen;
+    }
+
+private:
+    /**
+     * Characteristic's UUID.
+     */
+    UUID      _uuid;
+    /**
+     * Pointer to the attribute's value.
+     */
+    uint8_t  *_valuePtr;
+    /**
+     * Maximum length of the value pointed to by GattAttribute::_valuePtr.
+     */
+    uint16_t  _lenMax;
+    /**
+     * Current length of the value pointed to by GattAttribute::_valuePtr.
+     */
+    uint16_t  _len;
+    /**
+     * Whether the length of the value can change over time.
+     */
+    bool      _hasVariableLen;
+    /**
+     * The attribute's handle in the ATT table.
+     */
+    Handle_t  _handle;
+
+private:
+    /* Disallow copy and assignment. */
+    GattAttribute(const GattAttribute &);
+    GattAttribute& operator=(const GattAttribute &);
+};
+
+#endif /* ifndef __GATT_ATTRIBUTE_H__ */