-#ifndef CACHE_H_
-#define CACHE_H_
-
-#include <list>
-#include <map>
-#include <msp/fs/path.h>
-#include <msp/time/timestamp.h>
-
-class SourcePackage;
-class Target;
-
-/**
-Stores data between build runs. This can be used to avoid scanning files again
-every time builder is run, or to detect outside changes.
-
-Data is stored as lists of strings and keyed to target and an arbitrary
-identifier. Any kind of strings can be stored, even ones that contain
-unprintable characters or nuls.
-*/
-class Cache
-{
-public:
- typedef std::list<std::string> ValueList;
-private:
- typedef std::pair<std::string, std::string> Key;
- typedef std::map<Key, ValueList> DataMap;
-
- SourcePackage &package;
- Msp::FS::Path filename;
- DataMap data;
- Msp::Time::TimeStamp mtime;
- mutable bool changed;
-
-public:
- Cache(SourcePackage &p);
-
- /// Sets a key to a single value, replacing any existing values.
- void set_value(const Target *, const std::string &, const std::string &);
-
- /// Appends a value to a key. If the key does not exist, it is created.
- void append_value(const Target *, const std::string &, const std::string &);
-
- /// Sets a key to a list of values, replacing any existing values.
- void set_values(const Target *, const std::string &, const ValueList &);
-
- /** Returns the first value from a key. The key must exist and be
- non-empty. */
- const std::string &get_value(const Target *, const std::string &);
-
- /// Returns the values from a key. The key must exist.
- const ValueList &get_values(const Target *, const std::string &);
-
- /// Indicates whether a key exists.
- bool has_key(const Target *, const std::string &);
-
- /// Returns the last modification timestamp of the cache.
- const Msp::Time::TimeStamp &get_mtime() const { return mtime; }
-
- /** Loads the cache file and sets the last modification timestamp
- accordingly. */
- void load();
-
- /** Saves the cache. Does nothing if there is no data to save or nothing
- has changed. */
- void save() const;
-};
-
-#endif