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FRC2016-old/wpilib/cpp/current/include/tables/ITable.h

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2016-01-28 11:33:19 -05:00
/*----------------------------------------------------------------------------*/
/* Copyright (c) FIRST 2015. All Rights Reserved. */
/* Open Source Software - may be modified and shared by FRC teams. The code */
/* must be accompanied by the FIRST BSD license file in the root directory of */
/* the project. */
/*----------------------------------------------------------------------------*/
#ifndef ITABLE_H_
#define ITABLE_H_
#include <memory>
#include "llvm/StringRef.h"
#include "nt_Value.h"
// [[deprecated(msg)]] is a C++14 feature not supported by MSVC or GCC < 4.9.
// We provide an equivalent warning implementation for those compilers here.
#ifndef NT_DEPRECATED
#if defined(_MSC_VER)
#define NT_DEPRECATED(msg) __declspec(deprecated(msg))
#elif defined(__GNUC__)
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 8)
#if __cplusplus > 201103L
#define NT_DEPRECATED(msg) [[deprecated(msg)]]
#else
#define NT_DEPRECATED(msg) [[gnu::deprecated(msg)]]
#endif
#else
#define NT_DEPRECATED(msg) __attribute__((deprecated(msg)))
#endif
#elif __cplusplus > 201103L
#define NT_DEPRECATED(msg) [[deprecated(msg)]]
#else
#define NT_DEPRECATED(msg) /*nothing*/
#endif
#endif
class ITableListener;
/**
* A table whose values can be read and written to
*/
class ITable {
public:
/**
* Determines whether the given key is in this table.
*
* @param key the key to search for
* @return true if the table as a value assigned to the given key
*/
virtual bool ContainsKey(llvm::StringRef key) const = 0;
/**
* Determines whether there exists a non-empty subtable for this key
* in this table.
*
* @param key the key to search for
* @return true if there is a subtable with the key which contains at least
* one key/subtable of its own
*/
virtual bool ContainsSubTable(llvm::StringRef key) const = 0;
/**
* Gets the subtable in this table for the given name.
*
* @param key the name of the table relative to this one
* @return a sub table relative to this one
*/
virtual std::shared_ptr<ITable> GetSubTable(llvm::StringRef key) const = 0;
/**
* @param types bitmask of types; 0 is treated as a "don't care".
* @return keys currently in the table
*/
virtual std::vector<std::string> GetKeys(int types = 0) const = 0;
/**
* @return subtables currently in the table
*/
virtual std::vector<std::string> GetSubTables() const = 0;
/**
* Makes a key's value persistent through program restarts.
*
* @param key the key to make persistent
*/
virtual void SetPersistent(llvm::StringRef key) = 0;
/**
* Stop making a key's value persistent through program restarts.
* The key cannot be null.
*
* @param key the key name
*/
virtual void ClearPersistent(llvm::StringRef key) = 0;
/**
* Returns whether the value is persistent through program restarts.
* The key cannot be null.
*
* @param key the key name
*/
virtual bool IsPersistent(llvm::StringRef key) const = 0;
/**
* Sets flags on the specified key in this table. The key can
* not be null.
*
* @param key the key name
* @param flags the flags to set (bitmask)
*/
virtual void SetFlags(llvm::StringRef key, unsigned int flags) = 0;
/**
* Clears flags on the specified key in this table. The key can
* not be null.
*
* @param key the key name
* @param flags the flags to clear (bitmask)
*/
virtual void ClearFlags(llvm::StringRef key, unsigned int flags) = 0;
/**
* Returns the flags for the specified key.
*
* @param key the key name
* @return the flags, or 0 if the key is not defined
*/
virtual unsigned int GetFlags(llvm::StringRef key) const = 0;
/**
* Deletes the specified key in this table.
*
* @param key the key name
*/
virtual void Delete(llvm::StringRef key) = 0;
/**
* Gets the value associated with a key as an object
*
* @param key the key of the value to look up
* @return the value associated with the given key, or nullptr if the key
* does not exist
*/
virtual std::shared_ptr<nt::Value> GetValue(llvm::StringRef key) const = 0;
/**
* Put a value in the table
*
* @param key the key to be assigned to
* @param value the value that will be assigned
* @return False if the table key already exists with a different type
*/
virtual bool PutValue(llvm::StringRef key,
std::shared_ptr<nt::Value> value) = 0;
/**
* Put a number in the table
*
* @param key the key to be assigned to
* @param value the value that will be assigned
* @return False if the table key already exists with a different type
*/
virtual bool PutNumber(llvm::StringRef key, double value) = 0;
/**
* Gets the number associated with the given name.
*
* @param key the key to look up
* @return the value associated with the given key
* @throws TableKeyNotDefinedException if there is no value associated with
* the given key
* @deprecated This exception-raising method has been replaced by the
* default-taking method.
*/
NT_DEPRECATED("Raises an exception if key not found; "
"use GetNumber(StringRef key, double defaultValue) instead")
virtual double GetNumber(llvm::StringRef key) const = 0;
/**
* Gets the number associated with the given name.
*
* @param key the key to look up
* @param defaultValue the value to be returned if no value is found
* @return the value associated with the given key or the given default value
* if there is no value associated with the key
*/
virtual double GetNumber(llvm::StringRef key, double defaultValue) const = 0;
/**
* Put a string in the table
*
* @param key the key to be assigned to
* @param value the value that will be assigned
* @return False if the table key already exists with a different type
*/
virtual bool PutString(llvm::StringRef key, llvm::StringRef value) = 0;
/**
* Gets the string associated with the given name.
*
* @param key the key to look up
* @return the value associated with the given key
* @throws TableKeyNotDefinedException if there is no value associated with
* the given key
* @deprecated This exception-raising method has been replaced by the
* default-taking method.
*/
NT_DEPRECATED("Raises an exception if key not found; "
"use GetString(StringRef key, StringRef defaultValue) instead")
virtual std::string GetString(llvm::StringRef key) const = 0;
/**
* Gets the string associated with the given name. If the key does not
* exist or is of different type, it will return the default value.
*
* @param key the key to look up
* @param defaultValue the value to be returned if no value is found
* @return the value associated with the given key or the given default value
* if there is no value associated with the key
*
* @note This makes a copy of the string. If the overhead of this is a
* concern, use GetValue() instead.
*/
virtual std::string GetString(llvm::StringRef key,
llvm::StringRef defaultValue) const = 0;
/**
* Put a boolean in the table
*
* @param key the key to be assigned to
* @param value the value that will be assigned
* @return False if the table key already exists with a different type
*/
virtual bool PutBoolean(llvm::StringRef key, bool value) = 0;
/**
* Gets the boolean associated with the given name.
*
* @param key the key to look up
* @return the value associated with the given key
* @throws TableKeyNotDefinedException if there is no value associated with
* the given key
* @deprecated This exception-raising method has been replaced by the
* default-taking method.
*/
NT_DEPRECATED("Raises an exception if key not found; "
"use GetBoolean(StringRef key, bool defaultValue) instead")
virtual bool GetBoolean(llvm::StringRef key) const = 0;
/**
* Gets the boolean associated with the given name. If the key does not
* exist or is of different type, it will return the default value.
*
* @param key the key to look up
* @param defaultValue the value to be returned if no value is found
* @return the value associated with the given key or the given default value
* if there is no value associated with the key
*/
virtual bool GetBoolean(llvm::StringRef key, bool defaultValue) const = 0;
/**
* Put a boolean array in the table
* @param key the key to be assigned to
* @param value the value that will be assigned
* @return False if the table key already exists with a different type
*
* @note The array must be of int's rather than of bool's because
* std::vector<bool> is special-cased in C++. 0 is false, any
* non-zero value is true.
*/
virtual bool PutBooleanArray(llvm::StringRef key,
llvm::ArrayRef<int> value) = 0;
/**
* Returns the boolean array the key maps to. If the key does not exist or is
* of different type, it will return the default value.
* @param key the key to look up
* @param defaultValue the value to be returned if no value is found
* @return the value associated with the given key or the given default value
* if there is no value associated with the key
*
* @note This makes a copy of the array. If the overhead of this is a
* concern, use GetValue() instead.
*
* @note The returned array is std::vector<int> instead of std::vector<bool>
* because std::vector<bool> is special-cased in C++. 0 is false, any
* non-zero value is true.
*/
virtual std::vector<int> GetBooleanArray(
llvm::StringRef key, llvm::ArrayRef<int> defaultValue) const = 0;
/**
* Put a number array in the table
* @param key the key to be assigned to
* @param value the value that will be assigned
* @return False if the table key already exists with a different type
*/
virtual bool PutNumberArray(llvm::StringRef key,
llvm::ArrayRef<double> value) = 0;
/**
* Returns the number array the key maps to. If the key does not exist or is
* of different type, it will return the default value.
* @param key the key to look up
* @param defaultValue the value to be returned if no value is found
* @return the value associated with the given key or the given default value
* if there is no value associated with the key
*
* @note This makes a copy of the array. If the overhead of this is a
* concern, use GetValue() instead.
*/
virtual std::vector<double> GetNumberArray(
llvm::StringRef key, llvm::ArrayRef<double> defaultValue) const = 0;
/**
* Put a string array in the table
* @param key the key to be assigned to
* @param value the value that will be assigned
* @return False if the table key already exists with a different type
*/
virtual bool PutStringArray(llvm::StringRef key,
llvm::ArrayRef<std::string> value) = 0;
/**
* Returns the string array the key maps to. If the key does not exist or is
* of different type, it will return the default value.
* @param key the key to look up
* @param defaultValue the value to be returned if no value is found
* @return the value associated with the given key or the given default value
* if there is no value associated with the key
*
* @note This makes a copy of the array. If the overhead of this is a
* concern, use GetValue() instead.
*/
virtual std::vector<std::string> GetStringArray(
llvm::StringRef key, llvm::ArrayRef<std::string> defaultValue) const = 0;
/**
* Put a raw value (byte array) in the table
* @param key the key to be assigned to
* @param value the value that will be assigned
* @return False if the table key already exists with a different type
*/
virtual bool PutRaw(llvm::StringRef key, llvm::StringRef value) = 0;
/**
* Returns the raw value (byte array) the key maps to. If the key does not
* exist or is of different type, it will return the default value.
* @param key the key to look up
* @param defaultValue the value to be returned if no value is found
* @return the value associated with the given key or the given default value
* if there is no value associated with the key
*
* @note This makes a copy of the raw contents. If the overhead of this is a
* concern, use GetValue() instead.
*/
virtual std::string GetRaw(llvm::StringRef key,
llvm::StringRef defaultValue) const = 0;
/**
* Add a listener for changes to the table
*
* @param listener the listener to add
*/
virtual void AddTableListener(ITableListener* listener) = 0;
/**
* Add a listener for changes to the table
*
* @param listener the listener to add
* @param immediateNotify if true then this listener will be notified of all
* current entries (marked as new)
*/
virtual void AddTableListener(ITableListener* listener,
bool immediateNotify) = 0;
/**
* Add a listener for changes to the table
*
* @param listener the listener to add
* @param immediateNotify if true then this listener will be notified of all
* current entries (marked as new)
* @param flags bitmask of NT_NotifyKind specifying desired notifications
*/
virtual void AddTableListenerEx(ITableListener* listener,
unsigned int flags) = 0;
/**
* Add a listener for changes to a specific key the table
*
* @param key the key to listen for
* @param listener the listener to add
* @param immediateNotify if true then this listener will be notified of all
* current entries (marked as new)
*/
virtual void AddTableListener(llvm::StringRef key, ITableListener* listener,
bool immediateNotify) = 0;
/**
* Add a listener for changes to a specific key the table
*
* @param key the key to listen for
* @param listener the listener to add
* @param immediateNotify if true then this listener will be notified of all
* current entries (marked as new)
* @param flags bitmask of NT_NotifyKind specifying desired notifications
*/
virtual void AddTableListenerEx(llvm::StringRef key, ITableListener* listener,
unsigned int flags) = 0;
/**
* This will immediately notify the listener of all current sub tables
* @param listener the listener to add
*/
virtual void AddSubTableListener(ITableListener* listener) = 0;
/**
* This will immediately notify the listener of all current sub tables
* @param listener the listener to add
* @param localNotify if true then this listener will be notified of all
* local changes in addition to all remote changes
*/
virtual void AddSubTableListener(ITableListener* listener,
bool localNotify) = 0;
/**
* Remove a listener from receiving table events
*
* @param listener the listener to be removed
*/
virtual void RemoveTableListener(ITableListener* listener) = 0;
};
#endif // ITABLE_H_