Old JspContextWrapper

JspContextWrapperOld.java (text/plain), 14.28 KB, created by Sheldon Shao on 2012-11-12 05:56:09 UTC

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Description: Old JspContextWrapper

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Creator: Sheldon Shao

Created: 2012-11-12 05:56:09 UTC

Size: 14.28 KB

patch

obsolete

>/* > * Licensed to the Apache Software Foundation (ASF) under one or more > * contributor license agreements. See the NOTICE file distributed with > * this work for additional information regarding copyright ownership. > * The ASF licenses this file to You under the Apache License, Version 2.0 > * (the "License"); you may not use this file except in compliance with > * the License. You may obtain a copy of the License at > * > * http://www.apache.org/licenses/LICENSE-2.0 > * > * Unless required by applicable law or agreed to in writing, software > * distributed under the License is distributed on an "AS IS" BASIS, > * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. > * See the License for the specific language governing permissions and > * limitations under the License. > */ > >package org.apache.jasper.runtime; > >import java.io.IOException; >import java.io.Writer; >import java.util.ArrayList; >import java.util.Collections; >import java.util.Enumeration; >import java.util.HashMap; >import java.util.Iterator; >import java.util.Map; > >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.el.ELException; >import javax.servlet.jsp.el.ExpressionEvaluator; >import javax.servlet.jsp.el.VariableResolver; >import javax.servlet.jsp.tagext.BodyContent; >import javax.servlet.jsp.tagext.VariableInfo; > >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 > * @author Jacob Hookom > */ >public class JspContextWrapperOld extends PageContext implements VariableResolver { > > // Invoking JSP context > private PageContext invokingJspCtxt; > > private transient HashMap<String, Object> pageAttributes; > > // ArrayList of NESTED scripting variables > private ArrayList<String> nestedVars; > > // ArrayList of AT_BEGIN scripting variables > private ArrayList<String> atBeginVars; > > // ArrayList of AT_END scripting variables > private ArrayList<String> atEndVars; > > private Map<String,String> aliases; > > private HashMap<String, Object> originalNestedVars; > > public JspContextWrapperOld(JspContext jspContext, > ArrayList<String> nestedVars, ArrayList<String> atBeginVars, > ArrayList<String> atEndVars, Map<String,String> aliases) { > this.invokingJspCtxt = (PageContext) jspContext; > this.nestedVars = nestedVars; > this.atBeginVars = atBeginVars; > this.atEndVars = atEndVars; > this.pageAttributes = new HashMap<String, Object>(16); > this.aliases = aliases; > > if (nestedVars != null) { > this.originalNestedVars = new HashMap<String, Object>(nestedVars.size()); > } > syncBeginTagFile(); > } > > @Override > public void initialize(Servlet servlet, ServletRequest request, > ServletResponse response, String errorPageURL, > boolean needsSession, int bufferSize, boolean autoFlush) > throws IOException, IllegalStateException, IllegalArgumentException { > } > > @Override > public Object getAttribute(String name) { > > if (name == null) { > throw new NullPointerException(Localizer > .getMessage("jsp.error.attribute.null_name")); > } > > return pageAttributes.get(name); > } > > @Override > 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); > } > > @Override > 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); > } > } > > @Override > 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); > } > } > > @Override > 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; > } > > @Override > 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); > } > > @Override > 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); > } > } > > @Override > 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); > } > } > > @Override > public Enumeration<String> getAttributeNamesInScope(int scope) { > if (scope == PAGE_SCOPE) { > return Collections.enumeration(pageAttributes.keySet()); > } > > return invokingJspCtxt.getAttributeNamesInScope(scope); > } > > @Override > public void release() { > invokingJspCtxt.release(); > } > > @Override > public JspWriter getOut() { > return invokingJspCtxt.getOut(); > } > > @Override > public HttpSession getSession() { > return invokingJspCtxt.getSession(); > } > > @Override > public Object getPage() { > return invokingJspCtxt.getPage(); > } > > @Override > public ServletRequest getRequest() { > return invokingJspCtxt.getRequest(); > } > > @Override > public ServletResponse getResponse() { > return invokingJspCtxt.getResponse(); > } > > @Override > public Exception getException() { > return invokingJspCtxt.getException(); > } > > @Override > public ServletConfig getServletConfig() { > return invokingJspCtxt.getServletConfig(); > } > > @Override > public ServletContext getServletContext() { > return invokingJspCtxt.getServletContext(); > } > > @Override > public void forward(String relativeUrlPath) throws ServletException, > IOException { > invokingJspCtxt.forward(relativeUrlPath); > } > > @Override > public void include(String relativeUrlPath) throws ServletException, > IOException { > invokingJspCtxt.include(relativeUrlPath); > } > > @Override > public void include(String relativeUrlPath, boolean flush) > throws ServletException, IOException { > invokingJspCtxt.include(relativeUrlPath, false); > } > > @Override > @Deprecated > public VariableResolver getVariableResolver() { > return this; > } > > @Override > public BodyContent pushBody() { > return invokingJspCtxt.pushBody(); > } > > @Override > public JspWriter pushBody(Writer writer) { > return invokingJspCtxt.pushBody(writer); > } > > @Override > public JspWriter popBody() { > return invokingJspCtxt.popBody(); > } > > @Override > @Deprecated > public ExpressionEvaluator getExpressionEvaluator() { > return invokingJspCtxt.getExpressionEvaluator(); > } > > @Override > 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); > } > > @Override > public void handlePageException(Throwable t) throws IOException, > ServletException { > invokingJspCtxt.handlePageException(t); > } > > /** > * VariableResolver interface > */ > @Override > @Deprecated > public Object resolveVariable(String pName) throws ELException { > ELContext ctx = this.getELContext(); > return ctx.getELResolver().getValue(ctx, null, pName); > } > > /** > * Synchronize variables at begin of tag file > */ > public void syncBeginTagFile() { > saveNestedVariables(); > } > > /** > * Synchronize variables before fragment invocation > */ > 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<String> 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<String> 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<String> 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; > } > > //private ELContextImpl elContext; > > @Override > public ELContext getELContext() { > // instead decorate!!! > return invokingJspCtxt.getELContext(); > > /* > if (this.elContext != null) { > JspFactory jspFact = JspFactory.getDefaultFactory(); > ServletContext servletContext = this.getServletContext(); > JspApplicationContextImpl jspCtx = (JspApplicationContextImpl) jspFact > .getJspApplicationContext(servletContext); > this.elContext = jspCtx.createELContext(this); > } > return this.elContext; > */ > } >} View Attachment As Raw

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