/*
* 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.jstl.el;
import com.caucho.el.Expr;
import com.caucho.util.L10N;
import javax.el.ELContext;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.tagext.BodyTagSupport;
public class CoreSetTag extends BodyTagSupport {
private static L10N L = new L10N(CoreSetTag.class);
private Expr valueExpr;
private String var;
private String scope;
private Expr targetExpr;
private Expr propertyExpr;
/**
* Sets the JSP-EL expression value.
*/
public void setValue(Expr value)
{
this.valueExpr = value;
}
/**
* Sets the variable to assign
*/
public void setVar(String var)
{
this.var = var;
}
/**
* Sets the scope of the variable.
*/
public void setScope(String scope)
{
this.scope = scope;
}
/**
* Sets the target to be set.
*/
public void setTarget(Expr target)
{
this.targetExpr = target;
}
/**
* Sets the property to be set.
*/
public void setProperty(Expr property)
{
this.propertyExpr = property;
}
/**
* Process the tag.
*/
public int doStartTag()
throws JspException
{
try {
if (valueExpr == null)
return EVAL_BODY_BUFFERED;
ELContext env = pageContext.getELContext();
Object value = valueExpr.evalObject(env);
if (var != null)
setValue(value);
else
setProperty(value);
return SKIP_BODY;
} catch (Exception e) {
throw new JspException(e);
}
}
public int doEndTag() throws JspException
{
BodyContent body = (BodyContent) getBodyContent();
if (body != null) {
if (var != null)
setValue(body.getString().trim());
else
setProperty(body.getString().trim());
}
return EVAL_PAGE;
}
private void setValue(Object value)
throws JspException
{
if (scope == null) {
if (value != null)
pageContext.setAttribute(var, value);
else
pageContext.removeAttribute(var);
}
else if (scope.equals("page")) {
if (value != null)
pageContext.setAttribute(var, value);
else
pageContext.removeAttribute(var);
}
else if (scope.equals("request")) {
if (value != null)
pageContext.getRequest().setAttribute(var, value);
else
pageContext.getRequest().removeAttribute(var);
}
else if (scope.equals("session")) {
if (value != null)
pageContext.getSession().setAttribute(var, value);
else
pageContext.getSession().removeAttribute(var);
}
else if (scope.equals("application")) {
if (value != null)
pageContext.getServletContext().setAttribute(var, value);
else
pageContext.getServletContext().removeAttribute(var);
}
else
throw new JspException(L.l("illegal scope value {0}", scope));
}
private void setProperty(Object value)
throws JspException
{
try {
ELContext env = pageContext.getELContext();
Object target = targetExpr.evalObject(env);
String property = propertyExpr.evalString(env);
Expr.setProperty(target, property, value);
} catch (Exception e) {
throw new JspException(e);
}
}
public static void setValue(PageContext pageContext,
String var, String scope, Object value)
throws JspException
{
if (var == null) {
}
else if (scope == null || scope.equals("page")) {
if (value != null)
pageContext.setAttribute(var, value);
else
pageContext.removeAttribute(var);
}
else if (scope.equals("request")) {
if (value != null)
pageContext.getRequest().setAttribute(var, value);
else
pageContext.getRequest().removeAttribute(var);
}
else if (scope.equals("session")) {
if (value != null)
pageContext.getSession().setAttribute(var, value);
else
pageContext.getSession().removeAttribute(var);
}
else if (scope.equals("application")) {
if (value != null)
pageContext.getServletContext().setAttribute(var, value);
else
pageContext.getServletContext().removeAttribute(var);
}
else
throw new JspException(L.l("illegal scope value {0}", scope));
}
}