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package com.sun.jersey.spi.template;

import com.sun.jersey.api.view.Viewable;
import javax.ws.rs.core.UriInfo;

/**
 * The context for resolving an instance of {@link Viewable} to
 * an instance of {@link ResolvedViewable}.
 * 
 * @author [email protected]
 */
public interface TemplateContext {
    
    /**
     * Resolve a {@link Viewable}.
     * 
     * If the template name of the viewable is not absolute then the resolving
     * class of the viewable is utilized to resolve the relative template name
     * into an absolute template name. 
     * 
     * If the resolving class is not set (a null value) then the class of the
     * model is utilized as the resolving class.
     *
     * If the model is not set (a null value) then a {@link TemplateContextException}
     * is thrown.
     *
     * @param v the viewable
     * @return the resolved viewable
     * @throws TemplateContextException if the viewable cannot be resolved.
     */
    ResolvedViewable resolveViewable(Viewable v) throws TemplateContextException;

    /**
     * Resolve a {@link Viewable}.
     * 

     * If the template name of the viewable is not absolute then the resolving
     * class of the viewable is utilized to resolve the relative template name
     * into an absolute template name.
     *
     * If the resolving class is not set (a null value) 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 resoruces then a {@link TemplateContextException}
     * is thrown.
     *
     * @param v the viewable
     * @param ui
     * @return the resolved viewable
     * @throws TemplateContextException if the viewable cannot be resolved.
     */
    ResolvedViewable resolveViewable(Viewable v, UriInfo ui) throws TemplateContextException;

    /**
     * Resolve a {@link Viewable} given a resolving class.
     * 
     * If the template name of the viewable is not absolute then the resolving
     * class of the viewable is utilized to resolve the relative template name
     * into an absolute template name.
     *
     * If the resolving class is not set (a null value) then the class of the
     * resolvingClass parameter is utilized as the resolving class.
     *
     * If the resolvingClass parameter is null then a
     * {@link TemplateContextException} is thrown.
     *
     * @param v the viewable.
     * @param resolvingClass the resolving class to use if the resolving
     *        class of the viewable is not set.
     * @return the resolved viewable.
     * @throws TemplateContextException if the viewable cannot be resolved.
     */
    ResolvedViewable resolveViewable(Viewable v, Class resolvingClass) throws TemplateContextException;
}