Configuration (Flying Saucer Core Renderer 9.1.21 API)

java.lang.Object
- org.xhtmlrenderer.util.Configuration

```
public class Configuration
extends Object
```
Stores runtime configuration information for application parameters that may vary on restarting. This implements the Singleton pattern, but through static methods. That is, the first time Configuration is used, the properties are loaded into the Singleton instance. Subsequent calls to valueFor() retrieve values from the Singleton. To look up a property, use valueFor(String).

Properties may be overridden using a second properties file, or individually using System properties specified on the command line. To override using a second properties file, specify the System property xr-conf. This should be the location of the second file relative to the CLASSPATH, or else a file path, e.g.
java -Dxr-conf=resources/conf/myprops.conf
You can also place your override properties file in your user home directory, in
${user.home}/.flyingsaucer/local.xhtmlrenderer.conf
To override a property using the System properties, just re-define the property on the command line. e.g.
java -Dxr.property-name=new_value
The order in which these will be read is: default properties (bundled with the core, in the jar; override configuration properties; properties file in user.home; and system properties.

You can override as many properties as you like.

Note that overrides are driven by the property names in the default configuration file. Specifying a property name not in that file will have no effect--the property will not be loaded or available for lookup. Configuration is NOT used to control logging levels or output; see LogStartupConfig.

There are convenience converstion method for all the primitive types, in methods like valueAsInt(String, int). A default must always be provided for these methods. The default is returned if the value is not found, or if the conversion from String fails. If the value is not present, or the conversion fails, a warning message is written to the log.

Author:

Patrick Wright

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static boolean`	`hasValue(String key)`
`static boolean`	`isFalse(String key, boolean defaultVal)` Returns true if the value is not "true" (ignores case), or the default provided value if not found or if the value is not a valid boolean (true or false, ignores case).
`static boolean`	`isTrue(String key, boolean defaultVal)` Returns true if the value is "true" (ignores case), or the default provided value if not found or if the value is not a valid boolean (true or false, ignores case).
`static Iterator`	`keysByPrefix(String prefix)` Returns all configuration keys that start with prefix.
`static void`	`main(String[] args)` Command-line execution for testing.
`static void`	`setConfigLogger(Logger logger)` Sets the logger which we use for Configuration-related logging.
`static int`	`valueAsByte(String key, byte defaultVal)` Returns the value for key in the Configuration as a byte, or the default provided value if not found or if the value is not a valid byte.
`static char`	`valueAsChar(String key, char defaultVal)` Returns the value for key in the Configuration as a character, or a default value if not found.
`static double`	`valueAsDouble(String key, double defaultVal)` Returns the value for key in the Configuration as a double, or the default provided value if not found or if the value is not a valid double.
`static float`	`valueAsFloat(String key, float defaultVal)` Returns the value for key in the Configuration as a float, or the default provided value if not found or if the value is not a valid float.
`static int`	`valueAsInt(String key, int defaultVal)` Returns the value for key in the Configuration as an integer, or a default value if not found or if the value is not a valid integer.
`static long`	`valueAsLong(String key, long defaultVal)` Returns the value for key in the Configurationas a long, or the default provided value if not found or if the value is not a valid long.
`static int`	`valueAsShort(String key, short defaultVal)` Returns the value for key in the Configuration as a short, or the default provided value if not found or if the value is not a valid short.
`static String`	`valueFor(String key)` Returns the value for key in the Configuration.
`static String`	`valueFor(String key, String defaultVal)` Returns the value for key in the Configuration, or the default provided value if not found.
`static Object`	`valueFromClassConstant(String key, Object defaultValue)` Given a property, resolves the value to a public constant field on some class, where the field is of type Object.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - setConfigLogger
```
public static void setConfigLogger(Logger logger)
```
    Sets the logger which we use for Configuration-related logging. Before this is called the first time, all internal log records are queued up; they are flushed to the logger when this method is first called. Afterwards, all log events are written to this logger. This queueing behavior helps avoid order-of-operations bugs related to loading configuration information related to logging.
    
    Parameters:
    
    logger - Logger used for Configuration-related messages
  - valueFor
```
public static String valueFor(String key)
```
    Returns the value for key in the Configuration. A warning is issued to the log if the property is not defined.
    
    Parameters:
    
    key - Name of the property.
    
    Returns:
    
    Value assigned to the key, as a String.
  - hasValue
```
public static boolean hasValue(String key)
```
  - valueAsByte
```
public static int valueAsByte(String key,
                              byte defaultVal)
```
    Returns the value for key in the Configuration as a byte, or the default provided value if not found or if the value is not a valid byte. A warning is issued to the log if the property is not defined, or if the conversion from String fails.
    
    Parameters:
    
    key - Name of the property.
    
    defaultVal - PARAM
    
    Returns:
    
    Value assigned to the key, as a String.
  - valueAsShort
```
public static int valueAsShort(String key,
                               short defaultVal)
```
    Returns the value for key in the Configuration as a short, or the default provided value if not found or if the value is not a valid short. A warning is issued to the log if the property is not defined, or if the conversion from String fails.
    
    Parameters:
    
    key - Name of the property.
    
    defaultVal - PARAM
    
    Returns:
    
    Value assigned to the key, as a String.
  - valueAsInt
```
public static int valueAsInt(String key,
                             int defaultVal)
```
    Returns the value for key in the Configuration as an integer, or a default value if not found or if the value is not a valid integer. A warning is issued to the log if the property is not defined, or if the conversion from String fails.
    
    Parameters:
    
    key - Name of the property.
    
    defaultVal - PARAM
    
    Returns:
    
    Value assigned to the key, as a String.
  - valueAsChar
```
public static char valueAsChar(String key,
                               char defaultVal)
```
    Returns the value for key in the Configuration as a character, or a default value if not found. A warning is issued to the log if the property is not defined, or if the configuration value is too long to be a char. If the configuration value is longer than a single character, only the first character is returned.
    
    Parameters:
    
    key - Name of the property
    
    defaultVal - PARAM
  - valueAsLong
```
public static long valueAsLong(String key,
                               long defaultVal)
```
    Returns the value for key in the Configurationas a long, or the default provided value if not found or if the value is not a valid long. A warning is issued to the log if the property is not defined, or if the conversion from String fails.
    
    Parameters:
    
    key - Name of the property.
    
    defaultVal - PARAM
    
    Returns:
    
    Value assigned to the key, as a String.
  - valueAsFloat
```
public static float valueAsFloat(String key,
                                 float defaultVal)
```
    Returns the value for key in the Configuration as a float, or the default provided value if not found or if the value is not a valid float. A warning is issued to the log if the property is not defined, or if the conversion from String fails.
    
    Parameters:
    
    key - Name of the property.
    
    defaultVal - PARAM
    
    Returns:
    
    Value assigned to the key, as a String.
  - valueAsDouble
```
public static double valueAsDouble(String key,
                                   double defaultVal)
```
    Returns the value for key in the Configuration as a double, or the default provided value if not found or if the value is not a valid double. A warning is issued to the log if the property is not defined, or if the conversion from String fails.
    
    Parameters:
    
    key - Name of the property.
    
    defaultVal - PARAM
    
    Returns:
    
    Value assigned to the key, as a String.
  - valueFor
```
public static String valueFor(String key,
                              String defaultVal)
```
    Returns the value for key in the Configuration, or the default provided value if not found. A warning is issued to the log if the property is not defined, and if the default is null.
    
    Parameters:
    
    key - Name of the property.
    
    defaultVal - PARAM
    
    Returns:
    
    Value assigned to the key, as a String.
  - keysByPrefix
```
public static Iterator keysByPrefix(String prefix)
```
    Returns all configuration keys that start with prefix. Iterator will be empty if no such keys are found.
    
    Parameters:
    
    prefix - Prefix to filter on. No regex.
    
    Returns:
    
    Returns Iterator, see description.
  - main
```
public static void main(String[] args)
```
    Command-line execution for testing. No arguments.
    
    Parameters:
    
    args - Ignored
  - isTrue
```
public static boolean isTrue(String key,
                             boolean defaultVal)
```
    Returns true if the value is "true" (ignores case), or the default provided value if not found or if the value is not a valid boolean (true or false, ignores case). A warning is issued to the log if the property is not defined, and if the default is null.
    
    Parameters:
    
    key - Name of the property.
    
    defaultVal - PARAM
    
    Returns:
    
    Value assigned to the key, as a String.
  - isFalse
```
public static boolean isFalse(String key,
                              boolean defaultVal)
```
    Returns true if the value is not "true" (ignores case), or the default provided value if not found or if the value is not a valid boolean (true or false, ignores case). A warning is issued to the log if the property is not defined, or the value is not a valid boolean.
    
    Parameters:
    
    key - Name of the property.
    
    defaultVal - PARAM
    
    Returns:
    
    Value assigned to the key, as a String.
  - valueFromClassConstant
```
public static Object valueFromClassConstant(String key,
                                            Object defaultValue)
```
    Given a property, resolves the value to a public constant field on some class, where the field is of type Object. The property value must the the FQN of the class and field, e.g. aKey=java.awt.RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR will return the value of the VALUE_INTERPOLATION_NEAREST_NEIGHBOR constant on the RendingHints class.
    
    Parameters:
    
    key - Name of the property
    
    defaultValue - Returned in case of error.
    
    Returns:
    
    Value of the constant, or defaultValue in case of error.

Class Configuration

Method Summary

Methods inherited from class java.lang.Object

Method Detail

setConfigLogger

valueFor

hasValue

valueAsByte

valueAsShort

valueAsInt

valueAsChar

valueAsLong

valueAsFloat

valueAsDouble

valueFor

keysByPrefix

main

isTrue

isFalse

valueFromClassConstant