com.jalios.util
Class JProperties

java.lang.Object
  java.util.Dictionary<K,V>
      java.util.Hashtable<String,String>
          com.jalios.util.JProperties

All Implemented Interfaces:

Serializable, Cloneable, Map<String,String>

Direct Known Subclasses:

LangProperties

public class JProperties
extends Hashtable<String,String>

This class, based on Properties manage properties file in UTF-8 encoding. Its save updateAndSave(File) methods keep layout of previous properties file.

Version:

$Revision: 21390 $

See Also:

Serialized Form

Field Summary

protected Set<JPropertiesListener>	listenerSet
protected boolean	propertyNameAsDefaultValue
static String	REVISION

Constructor Summary

JProperties()

Method Summary

void	addProperties(JProperties prop) Add every property of the given JProperties to this JProperties.
void	addProperties(Properties prop) Add every property of the given Properties to this JProperties.
void	addPropertiesListener(JPropertiesListener l) Adds a listener for any change of this JProperties.
protected static String[]	buildArrayFromString(String value, String[] defaultValue) Convert a string to a String[] using the following formats: "@value1value2
void	clearProperties() Clear all properties.
boolean	containsProperty(String name) Tests if this JProperties contains the given property key/name.
void	firePropertiesChange() Triggers a propertie change to notify all listener of this JProperties.
boolean	getBooleanProperty(String name, boolean defaultValue) Gets the value of a property as a boolean given its key/name.
double	getDoubleProperty(String name, double defaultValue) Gets the value of a property as a double value given its key/name.
float	getFloatProperty(String name, float defaultValue) Gets the value of a property as a float value given its key/name.
int[]	getIntArrayProperty(String name, int[] defaultValue) Gets the value of a property as a int array.
int	getIntegerProperty(String name, int defaultValue) Gets the value of a property as an int value given its key/name.
protected Set<JPropertiesListener>	getListenerSet() Retrieve set of all listeners for this JProperties.
long	getLongProperty(String name, long defaultValue) Gets the value of a property as a long value given its key/name.
JProperties	getProperties(String prefix) Returns a new property set of properties with key matching a given prefix.
String	getProperty(String name) Gets value of a property.
String	getProperty(String name, String defaultValue) Gets the value of a property given its key/name.
String[]	getStringArrayProperty(String name, String[] defaultValue) Gets the value of a property as a String array.
Map<String,Object>	getSubProperties(String prefix) Returns a map of properties built from those properties and having a given prefix.
void	load(File file) Reads a property file (key and element pairs) from the given File.
void	load(File file, String prefix) Reads a property file (key and element pairs) from the given File.
void	removePropertiesListener(JPropertiesListener l) Removes a listener for any change of this JProperties.
Object	setProperty(String name, String value) Sets value of a property.
void	updateAndSave(File file) Updates and save properties.

Methods inherited from class java.util.Hashtable

clear, clone, contains, containsKey, containsValue, elements, entrySet, equals, get, hashCode, isEmpty, keys, keySet, put, putAll, rehash, remove, size, toString, values

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

REVISION

public static final String REVISION

See Also:

Constant Field Values

propertyNameAsDefaultValue

protected boolean propertyNameAsDefaultValue

listenerSet

protected Set<JPropertiesListener> listenerSet

Constructor Detail

JProperties

public JProperties()

Method Detail

getListenerSet

protected Set<JPropertiesListener> getListenerSet()

Retrieve set of all listeners for this JProperties.

See Also:

addPropertiesListener(JPropertiesListener), removePropertiesListener(JPropertiesListener)

addPropertiesListener

public void addPropertiesListener(JPropertiesListener l)

Adds a listener for any change of this JProperties.

Parameters:

l - the listener to add

See Also:

removePropertiesListener(JPropertiesListener)

removePropertiesListener

public void removePropertiesListener(JPropertiesListener l)

Removes a listener for any change of this JProperties.

Parameters:

l - the listener to remove

See Also:

addPropertiesListener(JPropertiesListener)

firePropertiesChange

public void firePropertiesChange()

Triggers a propertie change to notify all listener of this JProperties.

See Also:

addPropertiesListener(JPropertiesListener)

containsProperty

public boolean containsProperty(String name)

Tests if this JProperties contains the given property key/name.

Parameters:

name - the key/name of the property to check

Returns:

true if the specified object is a key in this hashtable; false otherwise.

getProperty

public String getProperty(String name)

Gets value of a property.

Parameters:

name - the key/name of the property to retrieve

Returns:

the property value

getProperty

public String getProperty(String name,
                          String defaultValue)

Gets the value of a property given its key/name.

Parameters:

name - the key/name of the property to retrieve

defaultValue - the default value to use if the existing value is null.

Returns:

the value of a property given its key/name.

setProperty

public Object setProperty(String name,
                          String value)

Sets value of a property.

Parameters:

name - the key/name of the property to retrieve

value - the new value to assign.

Returns:

the previous value of the specified key/name

getBooleanProperty

public boolean getBooleanProperty(String name,
                                  boolean defaultValue)

Gets the value of a property as a boolean given its key/name.

Parameters:

name - the key/name of the property to retrieve

defaultValue - the default value to use if the existing value is null or is neither "false" nor "true" (case sensitive).

Returns:

the boolean value of the property

getIntegerProperty

public int getIntegerProperty(String name,
                              int defaultValue)

Gets the value of a property as an int value given its key/name.

Parameters:

name - the key/name of the property to retrieve

defaultValue - the default value to use if the existing value is null or if Integer.parseInt() throws exception during String to int conversion.

Returns:

the int value of the property

getLongProperty

public long getLongProperty(String name,
                            long defaultValue)

Gets the value of a property as a long value given its key/name.

Parameters:

name - the key/name of the property to retrieve

defaultValue - the default value to use if the existing value is null or if Long.parseLong() throws exception during String to long conversion.

Returns:

the long value of the property

getFloatProperty

public float getFloatProperty(String name,
                              float defaultValue)

Gets the value of a property as a float value given its key/name.

Parameters:

name - the key/name of the property to retrieve

defaultValue - the default value to use if the existing value is null or if Float.parseFloat() throws exception during String to float conversion.

Returns:

the float value of the property

getDoubleProperty

public double getDoubleProperty(String name,
                                double defaultValue)

Gets the value of a property as a double value given its key/name.

Parameters:

name - the key/name of the property to retrieve

defaultValue - the default value to use if the existing value is null or if Double.parseDouble() throws exception during String to double conversion.

Returns:

the double value of the property

getStringArrayProperty

public String[] getStringArrayProperty(String name,
                                       String[] defaultValue)

Gets the value of a property as a String array.
The property value should be in one of the following forms:

"@value1value2...", where delim is a one character delimiter.

"value1value2...", where delim is a character from " \t\n\r\f".

Parameters:

name - the key/name of the property to retrieve

defaultValue - the default value to use if the existing value is null or no values could be found in the conversion.

Returns:

a String array

buildArrayFromString

protected static String[] buildArrayFromString(String value,
                                               String[] defaultValue)

Convert a string to a String[] using the following formats:

"@value1value2...", where delim is a one character delimiter.

"value1value2...", where delim is a character from " \t\n\r\f".

Or return the default value if no values were found.

getIntArrayProperty

public int[] getIntArrayProperty(String name,
                                 int[] defaultValue)

Gets the value of a property as a int array. Uses same format of getStringArrayProperty(String, String[]).

Parameters:

name - the key/name of the property to retrieve

defaultValue - the default value to use if the existing value is null or no values could be found in the conversion.

Returns:

an int array

See Also:

getStringArrayProperty(String, String[])

addProperties

public void addProperties(Properties prop)

Add every property of the given Properties to this JProperties.

Parameters:

prop - the properties to be added

addProperties

public void addProperties(JProperties prop)

Add every property of the given JProperties to this JProperties.

Parameters:

prop - the jproperties to be added

getProperties

public JProperties getProperties(String prefix)

Returns a new property set of properties with key matching a given prefix.

Parameters:

prefix - the prefix the properties must match to be added to the returned JProperties instance, if null, all properties are added.

Returns:

a new property set of properties with key matching a given prefix.

getSubProperties

public Map<String,Object> getSubProperties(String prefix)

Returns a map of properties built from those properties and having a given prefix.
Example:
prop:
foo.bar.case1.x: value of x for case1
foo.bar.case1.y: value of y for case1
foo.bar.case2.x: value of x for case2
foo.bar.case2.y: value of y for case2
foo.bar.case2.z.t: value of z for case2

prop.getSubProperties("foo.bar.") returns a Map with the keys case1 and case2.

A JProperties is bound to case1 and it contains the properties:
x: value of x for case1
y: value of y for case1

A JProperties is bound to case2 and it contains the properties:
x: value of x for case2
y: value of y for case2
z.t: value of z for case2

Parameters:

prefix - the prefix

Returns:

a map with string as the key and either String or JProperties as the value.

Since:

jcms-5.7.2

clearProperties

public void clearProperties()

Clear all properties.

load

public void load(File file)
          throws IOException

Reads a property file (key and element pairs) from the given File. The file encoding is assumed to be UTF-8.

Parameters:

file - the file from which to read properties.

Throws:

IOException - if an error occurred when reading from the input stream.

IllegalArgumentException - if the input stream contains a malformed Unicode escape sequence.

See Also:

Properties.load(java.io.InputStream)

load

public void load(File file,
                 String prefix)
          throws IOException

Reads a property file (key and element pairs) from the given File. The file encoding is assumed to be UTF-8.

Parameters:

file - the file from which to read properties.

prefix - a prefix to use add to all properties' name. if null, no prefix is used.

Throws:

IOException - if an error occurred when reading from the input stream.

IllegalArgumentException - if the input stream contains a malformed Unicode escape sequence.

See Also:

Properties.load(java.io.InputStream)

updateAndSave

public void updateAndSave(File file)
                   throws IOException

Updates and save properties. The original layout is preserved for existing properties and comments New properties are appended.

Parameters:

file - the properties File to read and update.

Throws:

IOException