org.zkoss.util.resource
Class Labels

java.lang.Object
  org.zkoss.util.resource.Labels

public class Labels
extends java.lang.Object

Utilities to access labels. A label is a Locale-dependent string that is stored in a Locale-dependent file (*.properties).

Specify the library property of org.zkoss.util.resource.LabelLoader.class in zk.xml to provide a customized label loader for debugging purpose. (since 7.0.1)

Author:

tomyeh

Method Summary

static java.lang.String	getLabel(java.lang.String key) Returns the label of the specified key based on the current Locale, or null if no found.
static java.lang.String	getLabel(java.lang.String key, java.lang.Object[] args) Returns the label of the specified key and formats it with the specified argument, or null if not found.
static java.lang.String	getLabel(java.lang.String key, java.lang.String defValue) Returns the label of the specified key based on the current Locale, or the default value if no found.
static java.lang.String	getLabel(java.lang.String key, java.lang.String defValue, java.lang.Object[] args) Returns the label of the specified key and formats it with the specified argument, or the default value if not found.
static java.lang.String	getRequiredLabel(java.lang.String key) Returns the label of the specified key based on the current locale.
static java.lang.String	getRequiredLabel(java.lang.String key, java.lang.Object[] args) Returns the label of the specified key and formats it with the specified argument, or null if not found.
static java.util.Map<java.lang.String,java.lang.Object>	getSegmentedLabels() Returns the label or a map of labels associated with the key.
static void	register(LabelLocator locator) Registers a locator which is used to load the Locale-dependent labels from other resource, such as servlet contexts.
static void	register(LabelLocator2 locator) Registers a locator which is used to load the Locale-dependent labels from other resource, such as database.
static void	reset() Resets all cached labels and next call to getLabel(String) will cause re-loading the Locale dependent files.
static VariableResolver	setVariableResolver(VariableResolver resolv) Sets the variable resolver, which is used if an EL expression is specified.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getLabel

public static final java.lang.String getLabel(java.lang.String key)

Returns the label of the specified key based on the current Locale, or null if no found.

The current locale is given by Locales.getCurrent().

See Also:

getSegmentedLabels()

getLabel

public static final java.lang.String getLabel(java.lang.String key,
                                              java.lang.Object[] args)

Returns the label of the specified key and formats it with the specified argument, or null if not found.

It first uses getLabel(String) to load the label. Then, it, if not null, invokes MessageFormats.format(java.lang.String, java.lang.Object[], java.util.Locale) to format it.

The current locale is given by Locales.getCurrent().

Since:

3.0.6

getLabel

public static final java.lang.String getLabel(java.lang.String key,
                                              java.lang.String defValue)

Returns the label of the specified key based on the current Locale, or the default value if no found.

The current locale is given by Locales.getCurrent().

Parameters:

defValue - the value being returned if the key is not found

Since:

3.6.0

getLabel

public static final java.lang.String getLabel(java.lang.String key,
                                              java.lang.String defValue,
                                              java.lang.Object[] args)

Returns the label of the specified key and formats it with the specified argument, or the default value if not found.

It first uses getLabel(String, String) to load the label. Then, it, if not null, invokes MessageFormats.format(java.lang.String, java.lang.Object[], java.util.Locale) to format it.

The current locale is given by Locales.getCurrent().

Parameters:

defValue - the value being returned if the key is not found

Since:

3.6.0

getSegmentedLabels

public static final java.util.Map<java.lang.String,java.lang.Object> getSegmentedLabels()

Returns the label or a map of labels associated with the key. Unlike getLabel(java.lang.String), if a key of the label contains dot, it will be split into multiple keys and then grouped into map. For example, the following property file will parsed into a couple of maps, and getSegmentedLabels() returns a map containing a single entry. The entry's key is "a" and the value is another map with two entries "b" and "c". And, the value for "b" is another two-entries map (containing "c" and "d").

 a.b.c=1
 a.b.d=2
 a.e=3

This method is designed to make labels easier to be accessed in EL expressions.

On the other hand, getLabel(java.lang.String) does not split them, and you could access them by, say, getLabel("a.b.d").

Since:

5.0.7

getRequiredLabel

public static final java.lang.String getRequiredLabel(java.lang.String key)
                                               throws SystemException

Returns the label of the specified key based on the current locale. Unlike getLabel(String), it throws an exception if not found.

Throws:

SystemException - if no such label

Since:

3.0.6

getRequiredLabel

public static final java.lang.String getRequiredLabel(java.lang.String key,
                                                      java.lang.Object[] args)

Returns the label of the specified key and formats it with the specified argument, or null if not found. Unlike getLabel(String, Object[]), it throws an exception if not found.

The current locale is given by Locales.getCurrent().

Throws:

SystemException - if no such label

Since:

3.0.6

reset

public static final void reset()

Resets all cached labels and next call to getLabel(String) will cause re-loading the Locale dependent files.

setVariableResolver

public static final VariableResolver setVariableResolver(VariableResolver resolv)

Sets the variable resolver, which is used if an EL expression is specified.

Default: no resolver at all.

Returns:

the previous resolver, or null if no resolver.

register

public static final void register(LabelLocator locator)

Registers a locator which is used to load the Locale-dependent labels from other resource, such as servlet contexts.

register

public static final void register(LabelLocator2 locator)

Registers a locator which is used to load the Locale-dependent labels from other resource, such as database.

Since:

5.0.5