class Poco::Util::SystemConfiguration

Overview

This class implements a Configuration interface to various system properties and environment variables. More…

#include <SystemConfiguration.h>

class SystemConfiguration: public Poco::Util::AbstractConfiguration
{
protected:
    // methods

    virtual
    bool
    getRaw(
        const std::string& key,
        std::string& value
        ) const;

    virtual
    void
    setRaw(
        const std::string& key,
        const std::string& value
        );

    virtual
    void
    enumerate(
        const std::string& key,
        Keys& range
        ) const;

    virtual
    void
    removeRaw(const std::string& key);
};

Inherited Members

public:
    // typedefs

    typedef std::vector<std::string> Keys;

    // classes

    class KeyValue;

    // fields

    Poco::BasicEvent<KeyValue> propertyChanging;
    Poco::BasicEvent<const KeyValue> propertyChanged;
    Poco::BasicEvent<const std::string> propertyRemoving;
    Poco::BasicEvent<const std::string> propertyRemoved;

    // methods

    void
    duplicate() const;

    void
    release() const;

    int
    referenceCount() const;

    bool
    hasProperty(const std::string& key) const;

    bool
    hasOption(const std::string& key) const;

    bool
    has(const std::string& key) const;

    std::string
    getString(const std::string& key) const;

    std::string
    getString(
        const std::string& key,
        const std::string& defaultValue
        ) const;

    std::string
    getRawString(const std::string& key) const;

    std::string
    getRawString(
        const std::string& key,
        const std::string& defaultValue
        ) const;

    int
    getInt(const std::string& key) const;

    unsigned int
    getUInt(const std::string& key) const;

    int
    getInt(
        const std::string& key,
        int defaultValue
        ) const;

    unsigned int
    getUInt(
        const std::string& key,
        unsigned int defaultValue
        ) const;

    double
    getDouble(const std::string& key) const;

    double
    getDouble(
        const std::string& key,
        double defaultValue
        ) const;

    bool
    getBool(const std::string& key) const;

    bool
    getBool(
        const std::string& key,
        bool defaultValue
        ) const;

    virtual
    void
    setString(
        const std::string& key,
        const std::string& value
        );

    virtual
    void
    setInt(
        const std::string& key,
        int value
        );

    virtual
    void
    setUInt(
        const std::string& key,
        unsigned int value
        );

    virtual
    void
    setDouble(
        const std::string& key,
        double value
        );

    virtual
    void
    setBool(
        const std::string& key,
        bool value
        );

    void
    keys(Keys& range) const;

    void
    keys(
        const std::string& key,
        Keys& range
        ) const;

    const AbstractConfiguration*
    createView(const std::string& prefix) const;

    AbstractConfiguration*
    createView(const std::string& prefix);

    std::string
    expand(const std::string& value) const;

    void
    remove(const std::string& key);

    void
    enableEvents(bool enable = true);

    bool
    eventsEnabled() const;

protected:
    // methods

    virtual
    bool
    getRaw(
        const std::string& key,
        std::string& value
        ) const = 0;

    virtual
    void
    setRaw(
        const std::string& key,
        const std::string& value
        ) = 0;

    virtual
    void
    enumerate(
        const std::string& key,
        Keys& range
        ) const = 0;

    virtual
    void
    removeRaw(const std::string& key);

    void
    setRawWithEvent(
        const std::string& key,
        std::string value
        );

    static
    int
    parseInt(const std::string& value);

    static
    unsigned
    parseUInt(const std::string& value);

    static
    bool
    parseBool(const std::string& value);

Detailed Documentation

This class implements a Configuration interface to various system properties and environment variables.

The following properties are supported:

- system.osName: the operating system name
- system.osVersion: the operating system version
- system.osArchitecture: the operating system architecture
- system.nodeName: the node (or host) name
- system.nodeId: system ID, based on the Ethernet address (format "xxxxxxxxxxxx")
  of the first Ethernet adapter found on the system.
- system.currentDir: the current working directory
- system.homeDir: the user's home directory
- system.tempDir: the system's temporary directory
- system.dateTime: the current UTC date and time, formatted in ISO 8601 format.
- system.pid: the current process ID.
- system.env.<NAME>: the environment variable with the given <NAME>.

An attempt to set a system variable will result in an InvalidAccessException being thrown.

Enumerating environment variables is not supported. An attempt to call keys(“system.env”) will return an empty range.

Removing key is not supported. An attempt to remove a key results in a NotImplementedException being thrown.

Methods

virtual
bool
getRaw(
    const std::string& key,
    std::string& value
    ) const

If the property with the given key exists, stores the property’s value in value and returns true.

Otherwise, returns false.

Must be overridden by subclasses.

virtual
void
setRaw(
    const std::string& key,
    const std::string& value
    )

Sets the property with the given key to the given value.

An already existing value for the key is overwritten.

Must be overridden by subclasses.

virtual
void
enumerate(
    const std::string& key,
    Keys& range
    ) const

Returns in range the names of all subkeys under the given key.

If an empty key is passed, all root level keys are returned.

virtual
void
removeRaw(const std::string& key)

Removes the property with the given key.

Does nothing if the key does not exist.

Should be overridden by subclasses; the default implementation throws a Poco::NotImplementedException.