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package com.sun.jersey.api.view;
import com.sun.jersey.spi.template.TemplateContext;
import com.sun.jersey.spi.template.ViewProcessor;
/**
* A viewable type referencing a template by name and a model to be passed
* to the template. Such a type may be returned by a resource method of a
* resource class. In this respect the template is the view and the controller
* is the resource class in the Model View Controller pattern.
*
* The template name may be declared as absolute template name if the name
* begins with a '/', otherwise the template name is declared as a relative
* template name.
*
* A relative template name requires resolving to an absolute template name
* when the viewable type is processed.
*
* If a resolving class is present then that class will be used to resolve the
* relative template name.
*
* If a resolving class is not present then the class of the last matching
* resource obtained from {@link javax.ws.rs.core.UriInfo#getMatchedResources() },
* namely the class obtained from the expression
* uriInfo.getMatchedResources().get(0).getClass(), is utilized
* as the resolving class.
*
* If there are no matching resources then an error will result.
*
*
* The resolving class, and super classes in the inheritence hierarchy, are
* utilized to generate the absolute template name as follows.
*
* The base path starts with '/' character, followed by the fully
* qualified class name of the resolving class, with any '.' and '$' characters
* replaced with a '/' character, followed by a '/' character,
* followed by the relative template name.
*
* If the absolute template name cannot be resolved into a template reference
* (see {@link ViewProcessor} and {@link TemplateContext}) then the super class
* of the resolving class is utilized, and is set as the resolving class.
* Traversal up the inheritence hierarchy proceeds until an absolute template
* name can be resolved into a template reference, or the Object class is
* reached, which means the absolute template name could not be resolved and
* an error will result.
*
* @author [email protected]
*/
public class Viewable {
private final String templateName;
private final Object model;
private final Class resolvingClass;
/**
* Construct a new viewable type with a template name and a model.
*
* @param templateName the template name, shall not be null.
* @param model the model, may be null.
*/
public Viewable(String templateName, Object model) {
this(templateName, model, null);
}
/**
* Construct a new viewable type with a template name, a model
* and a resolving class.
*
* @param templateName the template name, shall not be null.
* @param model the model, may be null.
* @param resolvingClass the class to use to resolve the template name
* if the template is not absolute, if null then the resolving
* class will be obtained from the last matching resource.
* @throws IllegalArgumentException if the template name is null.
*/
public Viewable(String templateName, Object model, Class resolvingClass)
throws IllegalArgumentException {
if (templateName == null)
throw new IllegalArgumentException("The template name MUST not be null");
this.templateName = templateName;
this.model = model;
this.resolvingClass = resolvingClass;
}
/**
* Get the template name.
*
* @return the template name.
*/
public String getTemplateName() {
return templateName;
}
/**
* Get the model.
*
* @return the model.
*/
public Object getModel() {
return model;
}
/**
* Get the resolving class.
*
* @return the resolving class.
*/
public Class getResolvingClass() {
return resolvingClass;
}
/**
*
* @return true if the template name is absolute, and starts with a
* '/' character
*/
public boolean isTemplateNameAbsolute() {
return templateName.length() > 0 && templateName.charAt(0) == '/';
}
}