package org.geoserver.web;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.logging.Logger;
import org.apache.wicket.Application;
import org.apache.wicket.Component;
import org.apache.wicket.MarkupContainer;
import org.apache.wicket.Page;
import org.apache.wicket.markup.html.WebComponent;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.WebPage;
import org.apache.wicket.resource.IPropertiesFactory;
import org.apache.wicket.resource.Properties;
import org.apache.wicket.resource.loader.ComponentStringResourceLoader;
import org.apache.wicket.resource.loader.IStringResourceLoader;
import org.apache.wicket.util.resource.locator.ResourceNameIterator;
import org.geotools.util.logging.Logging;
/**
* A custom localizer, heavily inspired by {@link ComponentStringResourceLoader},
* which considers two peculiarities of the GeoServer i18n subsystem:
* <ul>
* <li>All resources are loaded in GeoServer*.properties files located in the root of each jar</li>
* <li>Component resources are qualified by component or by page name</li>
* @author Andrea Aime - OpenGeo
* @author Justin Deoliveria - OpenGeo
*/
public class GeoServerStringResourceLoader implements IStringResourceLoader
{
/** Log. */
private static final Logger log = Logging.getLogger(GeoServerStringResourceLoader.class);
/**
* Create and initialize the resource loader.
*/
public GeoServerStringResourceLoader()
{
}
/**
* Get the string resource for the given combination of class, key, locale and style. The
* information is obtained from a resource bundle associated with the provided Class (or one of
* its super classes).
*
* @param clazz
* The Class to find resources to be loaded (might be null if we want a context-less search)
* @param key
* The key to obtain the string for
* @param locale
* The locale identifying the resource set to select the strings from
* @param style
* The (optional) style identifying the resource set to select the strings from (see
* {@link org.apache.wicket.Session})
* @return The string resource value or null if resource not found
*/
public String loadStringResource(Class clazz, final String key, final Locale locale,
final String style)
{
// Load the properties associated with the path
IPropertiesFactory propertiesFactory = Application.get().getResourceSettings()
.getPropertiesFactory();
// All GeoServer releated resources are loaded into a GeoServerApplication*.properties file
String path = "/GeoServerApplication";
while (true)
{
// Iterator over all the combinations
ResourceNameIterator iter = new ResourceNameIterator(path, style, locale,
"properties,xml");
while (iter.hasNext())
{
String newPath = (String)iter.next();
final Properties props = propertiesFactory.load(clazz, newPath);
if (props != null)
{
// Lookup the qualified key
String qualifiedKey = clazz != null ? clazz.getSimpleName() + "." + key : key;
String value = props.getString(qualifiedKey);
if (value != null)
return value;
}
}
// Didn't find the key yet, continue searching if possible
if (isStopResourceSearch(clazz))
{
break;
}
// Move to the next superclass
clazz = clazz.getSuperclass();
if (clazz == null)
{
// nothing more to search, done
break;
}
}
// not found
return null;
}
/**
*
* @see org.apache.wicket.resource.loader.IStringResourceLoader#loadStringResource(org.apache.wicket.Component,
* java.lang.String)
*/
public String loadStringResource(final Component component, final String key)
{
if (component == null)
{
return null;
}
// The return value
String string = null;
Locale locale = component.getLocale();
String style = component.getStyle();
// The reason why we need to create that stack is because we need to
// walk it downwards starting with Page down to the Component
List containmentStack = getComponentStack(component);
// Walk the component hierarchy down from page to the component
for (int i = containmentStack.size() - 1; (i >= 0) && (string == null); i--)
{
Class clazz = (Class)containmentStack.get(i);
// First, try the fully qualified resource name relative to the
// component on the path from page down.
string = loadStringResource(clazz, key, locale, style);
}
// If not found, than check if a property with the 'key' provided by
// the user can be found.
if (string == null)
{
string = loadStringResource(null, key, locale, style);
}
return string;
}
/**
* Traverse the component hierarchy up to the Page and add each component class to the list
* (stack) returned
*
* @param component
* The component to evaluate
* @return The stack of classes
*/
private List getComponentStack(final Component component)
{
// Build the search stack
final List searchStack = new ArrayList();
searchStack.add(component.getClass());
if (!(component instanceof Page))
{
// Add all the component on the way to the Page
MarkupContainer container = component.getParent();
while (container != null)
{
searchStack.add(container.getClass());
if (container instanceof Page)
{
break;
}
container = container.getParent();
}
}
return searchStack;
}
/**
* Check the supplied class to see if it is one that we shouldn't bother further searches up the
* class hierarchy for properties.
*
* @param clazz
* The class to check
* @return Whether to stop the search
*/
protected boolean isStopResourceSearch(final Class clazz)
{
if (clazz == null || clazz.equals(Object.class) || clazz.equals(Application.class))
{
return true;
}
// Stop at all html markup base classes
if (clazz.equals(WebPage.class) || clazz.equals(WebMarkupContainer.class) ||
clazz.equals(WebComponent.class))
{
return true;
}
// Stop at all wicket base classes
return clazz.equals(Page.class) || clazz.equals(MarkupContainer.class) ||
clazz.equals(Component.class);
}
}