/*
* 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.el;
import com.caucho.el.Expr;
import com.caucho.vfs.WriteStream;
import javax.el.ELContext;
import javax.el.ELException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.JspContext;
import javax.servlet.jsp.PageContext;
import java.io.IOException;
import java.util.*;
public class ImplicitFieldExpr extends Expr {
private int _index;
private Expr _field;
public ImplicitFieldExpr(int index, Expr field)
{
_index = index;
_field = field;
}
/**
* Evaluate the expr as an object.
*
* @param env the page context
*/
@Override
public Object getValue(ELContext env)
throws ELException
{
PageContext page = (PageContext) env.getContext(JspContext.class);
if (page == null)
return null;
Object fieldValue = _field.evalObject(env);
if (fieldValue == null)
return null;
String fieldString = toString(fieldValue, env);
switch (_index) {
case ImplicitObjectExpr.APPLICATION_SCOPE:
return page.getServletContext().getAttribute(fieldString);
case ImplicitObjectExpr.SESSION_SCOPE:
{
HttpSession session = page.getSession();
if (session != null) {
return session.getAttribute(fieldString);
}
else
return null;
}
case ImplicitObjectExpr.REQUEST_SCOPE:
{
return page.getRequest().getAttribute(fieldString);
}
case ImplicitObjectExpr.PAGE_SCOPE:
return page.getAttribute(fieldString);
case ImplicitObjectExpr.PARAM:
return page.getRequest().getParameter(fieldString);
case ImplicitObjectExpr.PARAM_VALUES:
return page.getRequest().getParameterValues(fieldString);
case ImplicitObjectExpr.HEADER:
return ((HttpServletRequest) page.getRequest()).getHeader(fieldString);
case ImplicitObjectExpr.HEADER_VALUES: {
Enumeration e =
((HttpServletRequest) page.getRequest()).getHeaders(fieldString);
if (e == null)
return null;
if (! e.hasMoreElements())
return null;
ArrayList<String> list = new ArrayList<String>();
while (e.hasMoreElements())
list.add((String) e.nextElement());
return list.toArray(new String[list.size()]);
}
case ImplicitObjectExpr.INIT_PARAM:
return page.getServletContext().getInitParameter(fieldString);
case ImplicitObjectExpr.COOKIE: {
Cookie []cookies = ((HttpServletRequest) page.getRequest()).getCookies();
if (cookies == null)
return null;
for (int i = 0; i < cookies.length; i++) {
if (cookies[i].getName().equals(fieldString))
return cookies[i];
}
return null;
}
}
throw new UnsupportedOperationException();
}
public String toString()
{
return "implicit_" + _index + "[" + _field + "]";
}
/**
* Prints the code to create an IdExpr.
*/
@Override
public void printCreate(WriteStream os)
throws IOException
{
os.print("new com.caucho.jsp.el.ImplicitFieldExpr(");
os.print(_index);
os.print(", ");
_field.printCreate(os);
os.print(")");
}
public static class AttributeMap extends AbstractMap {
private PageContext _pageContext;
private int _scope;
AttributeMap(PageContext pageContext, int scope)
{
_pageContext = pageContext;
_scope = scope;
}
public Object get(Object key)
{
return _pageContext.getAttribute((String) key, _scope);
}
public Object put(Object key, Object value)
{
_pageContext.setAttribute((String) key, value, _scope);
return null;
}
private EntrySet _entrySet;
public Set entrySet()
{
if (_entrySet == null)
_entrySet = new EntrySet();
return _entrySet;
}
public class EntrySet extends AbstractSet {
public int size()
{
Enumeration e = _pageContext.getAttributeNamesInScope(_scope);
int i = 0;
while (e.hasMoreElements()) {
e.nextElement();
i++;
}
return i;
}
public Iterator iterator()
{
return new EntryIterator();
}
}
public class EntryIterator implements Iterator, Map.Entry {
Enumeration _e;
String _name;
Object _value;
EntryIterator()
{
_e = _pageContext.getAttributeNamesInScope(_scope);
}
public boolean hasNext()
{
return _e.hasMoreElements();
}
public Object next()
{
_name = (String) _e.nextElement();
_value = _pageContext.getAttribute(_name, _scope);
return this;
}
public void remove()
{
throw new UnsupportedOperationException();
}
public Object getKey()
{
return _name;
}
public Object getValue()
{
return _value;
}
public Object setValue(Object value)
{
_pageContext.setAttribute(_name, value, _scope);
Object oldValue = _value;
_value = value;
return oldValue;
}
public int hashCode()
{
return _name.hashCode();
}
public boolean equals(Object obj)
{
if (! (obj instanceof EntryIterator))
return false;
EntryIterator entry = (EntryIterator) obj;
return (_name.equals(entry._name) &&
(_value == null && entry._value == null ||
_value != null && _value.equals(entry._value)));
}
}
}
}