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package javax.faces.view.facelets;

import java.io.IOException;
import java.net.URL;

import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.el.FunctionMapper;
import javax.el.VariableMapper;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;

/**
 * Context representative of a single
 * request from a Facelet.  This instance is passed to nearly every
 * method call in this API.
 *
 * @since 2.0
 */
public abstract class FaceletContext extends ELContext {
    
    // The key in the FacesContext attribute map
    // for the FaceletContext instance.
    public static final String FACELET_CONTEXT_KEY = 
            "javax.faces.FACELET_CONTEXT".intern();

    /**
     * The current FacesContext bound to
     * this "request".  Must not be null.
     * 
     * @return The current FacesContext bound to this "request".
     * 
     * @since 2.0
     */
    public abstract FacesContext getFacesContext();

    /**
     * Generate a unique ID for the passed
     * String
     * 
     * @param base the string from which to generate the ID.
     *
     * @return the generated id
     * 
     * @since 2.0
     */
    public abstract String generateUniqueId(String base);

    /**
     * The ExpressionFactory to use within
     * the Facelet this context is executing upon.  Must not be
     * null.
     * 
     * @return the {@code ExpressionFactory} for this Facelet.
     * 
     * @since 2.0
     */

    public abstract ExpressionFactory getExpressionFactory();

    /**
     * Set the VariableMapper to use in EL
     * evaluation/creation.
     * 
     * @param varMapper the new VariableMapper
     *
     * @since 2.0
     */
    public abstract void setVariableMapper(VariableMapper varMapper);

    /**
     * Set the FunctionMapper to use in EL
     * evaluation/creation.
     * 
     * @param fnMapper the new FunctionMapper
     *
     * @since 2.0
     */
    public abstract void setFunctionMapper(FunctionMapper fnMapper);

    /**
     * Support method which is backed by
     * the current VariableMapper.
     * 
     * @param name the name of the attribute
     * @param value the value of the attribute
     *
     * @since 2.0
     */
    public abstract void setAttribute(String name, Object value);

    /**
     * Return an attribute set by a
     * previous call to {@link #setAttribute}.  Support method which is
     * backed by the current VariableMapper
     * 
     * @param name the name of the attribute to return.
     * 
     * @return the value of the named attribute
     * 
     * @since 2.0
     */
    public abstract Object getAttribute(String name);

    /**
     * Include another Facelet defined at
     * some path, relative to the executing context, not the current
     * Facelet (same as include directive in JSP)
     * 
     * @param parent the UIComponent that will be the
     * parent of any components in the included facelet.
     * @param relativePath the path of the resource containing the
     * facelet markup, relative to the current markup

     * @throws IOException if unable to load relativePath

     * @throws FaceletException if unable to parse the markup loaded from relativePath

     * @throws javax.faces.FacesException if unable to create child UIComponent instances

     * @throws javax.el.ELException if any of the expressions in the markup
     * loaded from relativePath fail
     *
     * @since 2.0
     */
    public abstract void includeFacelet(UIComponent parent, String relativePath)
    throws IOException;

    /**
     * Include another Facelet defined at
     * some path, absolute to this ClassLoader/OS
     * 
     * @param parent the UIComponent that will be the
     * parent of any components in the included facelet.

     * @param absolutePath the absolute path to the resource containing
     * the facelet markup

     * @throws IOException if unable to load relativePath

     * @throws FaceletException if unable to parse the markup loaded from relativePath

     * @throws javax.faces.FacesException if unable to create child UIComponent instances

     * @throws javax.el.ELException if any of the expressions in the markup
     * loaded from relativePath fail

     */
    public abstract void includeFacelet(UIComponent parent, URL absolutePath)
    throws IOException;

}