/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.jsp.jsf;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.tagext.*;
import javax.el.*;
import javax.faces.application.*;
import javax.faces.context.*;
import javax.faces.component.*;
import javax.faces.component.html.*;
import javax.faces.webapp.*;
import com.caucho.util.*;
/**
* Utilities for JsfTags
*/
public class JsfTagUtil {
private static final L10N L = new L10N(JsfTagUtil.class);
public static UIViewRoot findRoot(FacesContext context,
ServletRequest req,
Object etag)
throws Exception
{
if (context == null)
context = FacesContext.getCurrentInstance();
UIViewRoot root = context.getViewRoot();
if (root == null)
throw new NullPointerException(L.l("f:view can't find current in FacesContext"));
Object oldETag = root.getAttributes().get("caucho.etag");
if (oldETag != null && ! oldETag.equals(etag)) {
// clear view on JSP change
root.getChildren().clear();
root.getFacets().clear();
}
root.getAttributes().put("caucho.etag", etag);
return root;
}
public static void afterRoot(FacesContext context,
HttpServletRequest req,
HttpServletResponse res)
{
HttpSession session = ((HttpServletRequest) req).getSession(false);
if (session != null)
session.setAttribute(ViewHandler.CHARACTER_ENCODING_KEY,
res.getCharacterEncoding());
}
public static UIComponent addTransient(FacesContext context,
ServletRequest req,
UIComponent parent,
String prevId,
Class childClass)
throws Exception
{
if (context == null)
context = FacesContext.getCurrentInstance();
if (parent == null) {
UIComponentClassicTagBase parentTag
= (UIComponentClassicTagBase) req.getAttribute("caucho.jsf.parent");
parent = parentTag.getComponentInstance();
BodyContent body = parentTag.getBodyContent();
if (body != null)
addVerbatim(parent, body);
}
UIComponent child = null;;
if (child == null)
child = (UIComponent) childClass.newInstance();
child.setTransient(true);
addChild(parent, prevId, child);
return child;
}
public static UIComponent addVerbatim(UIComponent parent,
String prevId,
String text)
throws Exception
{
HtmlOutputText verbatim = new HtmlOutputText();
verbatim.setTransient(true);
verbatim.setValue(text);
verbatim.setEscape(false);
addChild(parent, prevId, verbatim);
return verbatim;
}
public static UIComponent addVerbatim(UIComponent parent,
String text)
throws Exception
{
HtmlOutputText verbatim = new HtmlOutputText();
verbatim.setTransient(true);
verbatim.setValue(text);
verbatim.setEscape(false);
parent.getChildren().add(verbatim);
return verbatim;
}
private static void addChild(UIComponent parent,
String prevId,
UIComponent child)
{
if (parent != null) {
List<UIComponent> children = parent.getChildren();
int size = children.size();
boolean hasPrev = prevId == null;
int i = 0;
for (; i < size; i++) {
UIComponent oldChild = children.get(i);
if (hasPrev && oldChild.getId() != null) {
children.add(i, child);
return;
}
else if (prevId != null && prevId.equals(oldChild.getId()))
hasPrev = true;
}
parent.getChildren().add(child);
}
}
public static UIComponent findPersistent(FacesContext context,
ServletRequest req,
UIComponent parent,
String id)
throws Exception
{
if (context == null)
context = FacesContext.getCurrentInstance();
BodyContent body = null;
if (parent == null) {
UIComponentClassicTagBase parentTag
= (UIComponentClassicTagBase) req.getAttribute("caucho.jsf.parent");
parent = parentTag.getComponentInstance();
body = parentTag.getBodyContent();
}
if (parent != null) {
List<UIComponent> children = parent.getChildren();
int size = children.size();
String prevId = null;
for (int i = 0; i < size; i++) {
UIComponent child = children.get(i);
if (id.equals(child.getId())) {
if (body != null)
addVerbatim(parent, prevId, body);
return child;
}
if (child.getId() != null)
prevId = child.getId();
}
}
return null;
}
public static UIComponent addPersistent(FacesContext context,
ServletRequest req,
UIComponent parent,
ValueExpression binding,
Class childClass)
throws Exception
{
if (context == null)
context = FacesContext.getCurrentInstance();
if (parent == null) {
UIComponentClassicTagBase parentTag
= (UIComponentClassicTagBase) req.getAttribute("caucho.jsf.parent");
parent = parentTag.getComponentInstance();
BodyContent body = parentTag.getBodyContent();
addVerbatim(parent, body);
}
UIComponent child = null;
if (binding != null)
child = (UIComponent) binding.getValue(context.getELContext());
if (child == null) {
child = (UIComponent) childClass.newInstance();
// jsf/3251
if (binding != null)
binding.setValue(context.getELContext(), child);
}
if (parent != null)
parent.getChildren().add(child);
return child;
}
public static UIComponent addVerbatim(UIComponent parent,
String prevId,
BodyContent body)
throws Exception
{
String value = body.getString();
body.clear();
if (! isWhitespace(value))
return addVerbatim(parent, prevId, value);
else
return null;
}
public static UIComponent addVerbatim(UIComponent parent,
BodyContent body)
throws Exception
{
String value = body.getString();
body.clear();
if (! isWhitespace(value))
return addVerbatim(parent, value);
else
return null;
}
private static boolean isWhitespace(String text)
{
if (text == null)
return true;
boolean isWhitespace = true;
for (int i = text.length() - 1; i >= 0; i--) {
char ch = text.charAt(i);
if (! Character.isWhitespace(ch)) {
// check for comment
if (ch == '>' && text.indexOf("-->") + 2 == i) {
int head = text.indexOf("<!--");
if (head >= 0) {
for (int j = 0; j < head; j++) {
if (! Character.isWhitespace(text.charAt(j))) {
return false;
}
}
return true;
}
}
return false;
}
}
return true;
}
public static UIComponent findFacet(FacesContext context,
ServletRequest req,
UIComponent parent,
String facetName)
throws Exception
{
if (context == null)
FacesContext.getCurrentInstance();
if (parent == null) {
UIComponentClassicTagBase parentTag
= (UIComponentClassicTagBase) req.getAttribute("caucho.jsf.parent");
parent = parentTag.getComponentInstance();
}
if (parent != null)
return parent.getFacet(facetName);
else
return null;
}
public static UIComponent addFacet(FacesContext context,
ServletRequest req,
UIComponent parent,
String facetName,
ValueExpression binding,
Class childClass)
throws Exception
{
if (context == null)
context = FacesContext.getCurrentInstance();
if (parent == null) {
UIComponentClassicTagBase parentTag
= (UIComponentClassicTagBase) req.getAttribute("caucho.jsf.parent");
parent = parentTag.getComponentInstance();
}
UIComponent child = null;
if (binding != null)
child = (UIComponent) binding.getValue(context.getELContext());
if (child == null)
child = (UIComponent) childClass.newInstance();
if (parent != null)
parent.getFacets().put(facetName, child);
if (binding != null)
binding.setValue(context.getELContext(), child);
return child;
}
}