257 lines
11 KiB
C++
257 lines
11 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 5 End-User License
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Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
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27th April 2017).
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End User License Agreement: www.juce.com/juce-5-licence
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Privacy Policy: www.juce.com/juce-5-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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//==============================================================================
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/** Wrapper on a file that stores a list of key/value data pairs.
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Useful for storing application settings, etc. See the PropertySet class for
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the interfaces that read and write values.
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Not designed for very large amounts of data, as it keeps all the values in
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memory and writes them out to disk lazily when they are changed.
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Because this class derives from ChangeBroadcaster, ChangeListeners can be registered
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with it, and these will be signalled when a value changes.
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@see PropertySet
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@tags{DataStructures}
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*/
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class JUCE_API PropertiesFile : public PropertySet,
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public ChangeBroadcaster,
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private Timer
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{
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public:
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//==============================================================================
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enum StorageFormat
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{
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storeAsBinary,
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storeAsCompressedBinary,
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storeAsXML
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};
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//==============================================================================
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/** Structure describing properties file options */
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struct JUCE_API Options
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{
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/** Creates an empty Options structure.
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You'll need to fill-in the data members appropriately before using this structure.
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*/
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Options();
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/** The name of your application - this is used to help generate the path and filename
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at which the properties file will be stored. */
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String applicationName;
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/** The suffix to use for your properties file.
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It doesn't really matter what this is - you may want to use ".settings" or
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".properties" or something. If the suffix includes the prefixing dot (for example
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".settings") then the suffix of applicationName will be replaced with your suffix
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("MyApp.exe" -> "MyApp.settings"). If your filenameSuffix does NOT include the dot,
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then the suffix will be appended to the applicationName ("MyApp.exe" ->
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"MyApp.exe.settings").
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*/
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String filenameSuffix;
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/** The name of a subfolder in which you'd like your properties file to live.
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See the getDefaultFile() method for more details about how this is used.
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*/
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String folderName;
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/** If you're using properties files on a Mac, you must set this value - failure to
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do so will cause a runtime assertion.
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The PropertiesFile class always used to put its settings files in "Library/Preferences", but Apple
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have changed their advice, and now stipulate that settings should go in "Library/Application Support".
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Because older apps would be broken by a silent change in this class's behaviour, you must now
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explicitly set the osxLibrarySubFolder value to indicate which path you want to use.
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In newer apps, you should always set this to "Application Support" or
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"Application Support/YourSubFolderName".
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If your app needs to load settings files that were created by older versions of juce and
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you want to maintain backwards-compatibility, then you can set this to "Preferences".
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But.. for better Apple-compliance, the recommended approach would be to write some code that
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finds your old settings files in ~/Library/Preferences, moves them to ~/Library/Application Support,
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and then uses the new path.
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*/
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String osxLibrarySubFolder;
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/** If true, the file will be created in a location that's shared between users.
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The default constructor initialises this value to false.
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*/
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bool commonToAllUsers;
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/** If true, this means that property names are matched in a case-insensitive manner.
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See the PropertySet constructor for more info.
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The default constructor initialises this value to false.
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*/
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bool ignoreCaseOfKeyNames;
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/** If set to true, this prevents the file from being written to disk. */
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bool doNotSave;
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/** If this is zero or greater, then after a value is changed, the object will wait
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for this amount of time and then save the file. If this zero, the file will be
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written to disk immediately on being changed (which might be slow, as it'll re-write
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synchronously each time a value-change method is called). If it is less than zero,
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the file won't be saved until save() or saveIfNeeded() are explicitly called.
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The default constructor sets this to a reasonable value of a few seconds, so you
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only need to change it if you need a special case.
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*/
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int millisecondsBeforeSaving;
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/** Specifies whether the file should be written as XML, binary, etc.
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The default constructor sets this to storeAsXML, so you only need to set it explicitly
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if you want to use a different format.
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*/
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StorageFormat storageFormat;
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/** An optional InterprocessLock object that will be used to prevent multiple threads or
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processes from writing to the file at the same time. The PropertiesFile will keep a
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pointer to this object but will not take ownership of it - the caller is responsible for
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making sure that the lock doesn't get deleted before the PropertiesFile has been deleted.
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The default constructor initialises this value to nullptr, so you don't need to touch it
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unless you want to use a lock.
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*/
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InterProcessLock* processLock;
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/** This can be called to suggest a file that should be used, based on the values
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in this structure.
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So on a Mac, this will return a file called:
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~/Library/[osxLibrarySubFolder]/[folderName]/[applicationName].[filenameSuffix]
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On Windows it'll return something like:
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C:\\Documents and Settings\\username\\Application Data\\[folderName]\\[applicationName].[filenameSuffix]
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On Linux it'll return
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~/[folderName]/[applicationName].[filenameSuffix]
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If the folderName variable is empty, it'll use the app name for this (or omit the
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folder name on the Mac).
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The paths will also vary depending on whether commonToAllUsers is true.
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*/
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File getDefaultFile() const;
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};
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//==============================================================================
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/** Creates a PropertiesFile object.
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The file used will be chosen by calling PropertiesFile::Options::getDefaultFile()
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for the options provided. To set the file explicitly, use the other constructor.
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*/
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explicit PropertiesFile (const Options& options);
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/** Creates a PropertiesFile object.
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Unlike the other constructor, this one allows you to explicitly set the file that you
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want to be used, rather than using the default one.
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*/
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PropertiesFile (const File& file,
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const Options& options);
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/** Destructor.
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When deleted, the file will first call saveIfNeeded() to flush any changes to disk.
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*/
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~PropertiesFile() override;
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//==============================================================================
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/** Returns true if this file was created from a valid (or non-existent) file.
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If the file failed to load correctly because it was corrupt or had insufficient
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access, this will be false.
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*/
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bool isValidFile() const noexcept { return loadedOk; }
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//==============================================================================
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/** This will flush all the values to disk if they've changed since the last
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time they were saved.
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Returns false if it fails to write to the file for some reason (maybe because
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it's read-only or the directory doesn't exist or something).
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@see save
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*/
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bool saveIfNeeded();
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/** This will force a write-to-disk of the current values, regardless of whether
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anything has changed since the last save.
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Returns false if it fails to write to the file for some reason (maybe because
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it's read-only or the directory doesn't exist or something).
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@see saveIfNeeded
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*/
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bool save();
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/** Returns true if the properties have been altered since the last time they were saved.
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The file is flagged as needing to be saved when you change a value, but you can
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explicitly set this flag with setNeedsToBeSaved().
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*/
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bool needsToBeSaved() const;
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/** Explicitly sets the flag to indicate whether the file needs saving or not.
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@see needsToBeSaved
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*/
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void setNeedsToBeSaved (bool needsToBeSaved);
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/** Attempts to reload the settings from the file. */
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bool reload();
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//==============================================================================
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/** Returns the file that's being used. */
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const File& getFile() const noexcept { return file; }
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protected:
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/** @internal */
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void propertyChanged() override;
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private:
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//==============================================================================
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File file;
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Options options;
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bool loadedOk = false, needsWriting = false;
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using ProcessScopedLock = const std::unique_ptr<InterProcessLock::ScopedLockType>;
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InterProcessLock::ScopedLockType* createProcessLock() const;
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void timerCallback() override;
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bool saveAsXml();
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bool saveAsBinary();
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bool loadAsXml();
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bool loadAsBinary();
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bool loadAsBinary (InputStream&);
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bool writeToStream (OutputStream&);
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (PropertiesFile)
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};
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} // namespace juce
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