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package org.apache.jasper.runtime;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;
import javax.el.ELException;
import javax.el.ELContext;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.JspContext;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.tagext.VariableInfo;
import javax.servlet.jsp.el.VariableResolver;
import javax.servlet.jsp.el.ExpressionEvaluator;
import org.apache.jasper.compiler.Localizer;
/**
* Implementation of a JSP Context Wrapper.
*
* The JSP Context Wrapper is a JspContext created and maintained by a tag
* handler implementation. It wraps the Invoking JSP Context, that is, the
* JspContext instance passed to the tag handler by the invoking page via
* setJspContext().
*
* @author Kin-man Chung
* @author Jan Luehe
*/
public class JspContextWrapper extends PageContext {
// Invoking JSP context
private PageContext invokingJspCtxt;
private Hashtable pageAttributes;
// ArrayList of NESTED scripting variables
private ArrayList nestedVars;
// ArrayList of AT_BEGIN scripting variables
private ArrayList atBeginVars;
// ArrayList of AT_END scripting variables
private ArrayList atEndVars;
private Map aliases;
private HashMap originalNestedVars;
private ELContext elContext;
public JspContextWrapper(JspContext jspContext,
ArrayList nestedVars,
ArrayList atBeginVars,
ArrayList atEndVars,
Map aliases) {
this.invokingJspCtxt = (PageContext) jspContext;
this.nestedVars = nestedVars;
this.atBeginVars = atBeginVars;
this.atEndVars = atEndVars;
this.pageAttributes = new Hashtable(16);
this.aliases = aliases;
if (nestedVars != null) {
this.originalNestedVars =
new HashMap(nestedVars.size());
}
syncBeginTagFile();
}
public void initialize(Servlet servlet, ServletRequest request,
ServletResponse response, String errorPageURL,
boolean needsSession, int bufferSize,
boolean autoFlush)
throws IOException, IllegalStateException, IllegalArgumentException
{
}
public Object getAttribute(String name) {
if (name == null) {
throw new NullPointerException(
Localizer.getMessage("jsp.error.attribute.null_name"));
}
return pageAttributes.get(name);
}
public Object getAttribute(String name, int scope) {
if (name == null) {
throw new NullPointerException(
Localizer.getMessage("jsp.error.attribute.null_name"));
}
if (scope == PAGE_SCOPE) {
return pageAttributes.get(name);
}
return invokingJspCtxt.getAttribute(name, scope);
}
public void setAttribute(String name, Object value) {
if (name == null) {
throw new NullPointerException(
Localizer.getMessage("jsp.error.attribute.null_name"));
}
if (value != null) {
pageAttributes.put(name, value);
} else {
removeAttribute(name, PAGE_SCOPE);
}
}
public void setAttribute(String name, Object value, int scope) {
if (name == null) {
throw new NullPointerException(
Localizer.getMessage("jsp.error.attribute.null_name"));
}
if (scope == PAGE_SCOPE) {
if (value != null) {
pageAttributes.put(name, value);
} else {
removeAttribute(name, PAGE_SCOPE);
}
} else {
invokingJspCtxt.setAttribute(name, value, scope);
}
}
public Object findAttribute(String name) {
if (name == null) {
throw new NullPointerException(
Localizer.getMessage("jsp.error.attribute.null_name"));
}
Object o = pageAttributes.get(name);
if (o == null) {
o = invokingJspCtxt.getAttribute(name, REQUEST_SCOPE);
if (o == null) {
if (getSession() != null) {
o = invokingJspCtxt.getAttribute(name, SESSION_SCOPE);
}
if (o == null) {
o = invokingJspCtxt.getAttribute(name, APPLICATION_SCOPE);
}
}
}
return o;
}
public void removeAttribute(String name) {
if (name == null) {
throw new NullPointerException(
Localizer.getMessage("jsp.error.attribute.null_name"));
}
pageAttributes.remove(name);
invokingJspCtxt.removeAttribute(name, REQUEST_SCOPE);
if (getSession() != null) {
invokingJspCtxt.removeAttribute(name, SESSION_SCOPE);
}
invokingJspCtxt.removeAttribute(name, APPLICATION_SCOPE);
}
public void removeAttribute(String name, int scope) {
if (name == null) {
throw new NullPointerException(
Localizer.getMessage("jsp.error.attribute.null_name"));
}
if (scope == PAGE_SCOPE){
pageAttributes.remove(name);
} else {
invokingJspCtxt.removeAttribute(name, scope);
}
}
public int getAttributesScope(String name) {
if (name == null) {
throw new NullPointerException(
Localizer.getMessage("jsp.error.attribute.null_name"));
}
if (pageAttributes.get(name) != null) {
return PAGE_SCOPE;
} else {
return invokingJspCtxt.getAttributesScope(name);
}
}
public Enumeration getAttributeNamesInScope(int scope) {
if (scope == PAGE_SCOPE) {
return pageAttributes.keys();
}
return invokingJspCtxt.getAttributeNamesInScope(scope);
}
public void release() {
invokingJspCtxt.release();
}
public JspWriter getOut() {
return invokingJspCtxt.getOut();
}
public HttpSession getSession() {
return invokingJspCtxt.getSession();
}
public Object getPage() {
return invokingJspCtxt.getPage();
}
public ServletRequest getRequest() {
return invokingJspCtxt.getRequest();
}
public ServletResponse getResponse() {
return invokingJspCtxt.getResponse();
}
public Exception getException() {
return invokingJspCtxt.getException();
}
public ServletConfig getServletConfig() {
return invokingJspCtxt.getServletConfig();
}
public ServletContext getServletContext() {
return invokingJspCtxt.getServletContext();
}
static public PageContext getRootPageContext(PageContext pc) {
while (pc instanceof JspContextWrapper) {
pc = ((JspContextWrapper)pc).invokingJspCtxt;
}
return pc;
}
public ELContext getELContext() {
if (elContext == null) {
PageContext pc = invokingJspCtxt;
while (pc instanceof JspContextWrapper) {
pc = ((JspContextWrapper)pc).invokingJspCtxt;
}
PageContextImpl pci = (PageContextImpl) pc;
elContext = pci.getJspApplicationContext().createELContext(
invokingJspCtxt.getELContext().getELResolver());
elContext.putContext(javax.servlet.jsp.JspContext.class, this);
((ELContextImpl)elContext).setVariableMapper(
new VariableMapperImpl());
}
return elContext;
}
public void forward(String relativeUrlPath)
throws ServletException, IOException
{
invokingJspCtxt.forward(relativeUrlPath);
}
public void include(String relativeUrlPath)
throws ServletException, IOException
{
invokingJspCtxt.include(relativeUrlPath);
}
public void include(String relativeUrlPath, boolean flush)
throws ServletException, IOException {
invokingJspCtxt.include(relativeUrlPath, flush);
}
public VariableResolver getVariableResolver() {
return null;
}
public BodyContent pushBody() {
return invokingJspCtxt.pushBody();
}
public JspWriter pushBody(Writer writer) {
return invokingJspCtxt.pushBody(writer);
}
public JspWriter popBody() {
return invokingJspCtxt.popBody();
}
public ExpressionEvaluator getExpressionEvaluator() {
return invokingJspCtxt.getExpressionEvaluator();
}
public void handlePageException(Exception ex)
throws IOException, ServletException
{
// Should never be called since handleException() called with a
// Throwable in the generated servlet.
handlePageException((Throwable) ex);
}
public void handlePageException(Throwable t)
throws IOException, ServletException
{
invokingJspCtxt.handlePageException(t);
}
/**
* Synchronize variables at begin of tag file
*/
public void syncBeginTagFile() {
saveNestedVariables();
}
/**
* Synchronize variables before fragment invokation
*/
public void syncBeforeInvoke() {
copyTagToPageScope(VariableInfo.NESTED);
copyTagToPageScope(VariableInfo.AT_BEGIN);
}
/**
* Synchronize variables at end of tag file
*/
public void syncEndTagFile() {
copyTagToPageScope(VariableInfo.AT_BEGIN);
copyTagToPageScope(VariableInfo.AT_END);
restoreNestedVariables();
}
/**
* Copies the variables of the given scope from the virtual page scope of
* this JSP context wrapper to the page scope of the invoking JSP context.
*
* @param scope variable scope (one of NESTED, AT_BEGIN, or AT_END)
*/
private void copyTagToPageScope(int scope) {
Iterator iter = null;
switch (scope) {
case VariableInfo.NESTED:
if (nestedVars != null) {
iter = nestedVars.iterator();
}
break;
case VariableInfo.AT_BEGIN:
if (atBeginVars != null) {
iter = atBeginVars.iterator();
}
break;
case VariableInfo.AT_END:
if (atEndVars != null) {
iter = atEndVars.iterator();
}
break;
}
while ((iter != null) && iter.hasNext()) {
String varName = iter.next();
Object obj = getAttribute(varName);
varName = findAlias(varName);
if (obj != null) {
invokingJspCtxt.setAttribute(varName, obj);
} else {
invokingJspCtxt.removeAttribute(varName, PAGE_SCOPE);
}
}
}
/**
* Saves the values of any NESTED variables that are present in
* the invoking JSP context, so they can later be restored.
*/
private void saveNestedVariables() {
if (nestedVars != null) {
Iterator iter = nestedVars.iterator();
while (iter.hasNext()) {
String varName = iter.next();
varName = findAlias(varName);
Object obj = invokingJspCtxt.getAttribute(varName);
if (obj != null) {
originalNestedVars.put(varName, obj);
}
}
}
}
/**
* Restores the values of any NESTED variables in the invoking JSP
* context.
*/
private void restoreNestedVariables() {
if (nestedVars != null) {
Iterator iter = nestedVars.iterator();
while (iter.hasNext()) {
String varName = iter.next();
varName = findAlias(varName);
Object obj = originalNestedVars.get(varName);
if (obj != null) {
invokingJspCtxt.setAttribute(varName, obj);
} else {
invokingJspCtxt.removeAttribute(varName, PAGE_SCOPE);
}
}
}
}
/**
* Checks to see if the given variable name is used as an alias, and if so,
* returns the variable name for which it is used as an alias.
*
* @param varName The variable name to check
* @return The variable name for which varName is used as an alias, or
* varName if it is not being used as an alias
*/
private String findAlias(String varName) {
if (aliases == null)
return varName;
String alias = aliases.get(varName);
if (alias == null) {
return varName;
}
return alias;
}
}
