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java/javax/servlet/jsp/JspContext.java
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282
java/javax/servlet/jsp/JspContext.java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package javax.servlet.jsp;
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import java.util.Enumeration;
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import javax.el.ELContext;
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/**
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* <p>
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* <code>JspContext</code> serves as the base class for the
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* PageContext class and abstracts all information that is not specific
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* to servlets. This allows for Simple Tag Extensions to be used
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* outside of the context of a request/response Servlet.
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* <p>
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* The JspContext provides a number of facilities to the
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* page/component author and page implementor, including:
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* <ul>
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* <li>a single API to manage the various scoped namespaces
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* <li>a mechanism to obtain the JspWriter for output
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* <li>a mechanism to expose page directive attributes to the
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* scripting environment
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* </ul>
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*
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* <p><B>Methods Intended for Container Generated Code</B>
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* <p>
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* The following methods enable the <B>management of nested</B> JspWriter
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* streams to implement Tag Extensions: <code>pushBody()</code> and
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* <code>popBody()</code>
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*
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* <p><B>Methods Intended for JSP authors</B>
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* <p>
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* Some methods provide <B>uniform access</B> to the diverse objects
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* representing scopes.
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* The implementation must use the underlying machinery
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* corresponding to that scope, so information can be passed back and
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* forth between the underlying environment (e.g. Servlets) and JSP pages.
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* The methods are:
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* <code>setAttribute()</code>, <code>getAttribute()</code>,
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* <code>findAttribute()</code>, <code>removeAttribute()</code>,
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* <code>getAttributesScope()</code> and
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* <code>getAttributeNamesInScope()</code>.
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*
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* <p>
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* The following methods provide <B>convenient access</B> to implicit objects:
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* <code>getOut()</code>
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*
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* <p>
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* The following methods provide <B>programmatic access</b> to the
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* Expression Language evaluator:
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* <code>getExpressionEvaluator()</code>, <code>getVariableResolver()</code>
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*
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* @since 2.0
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*/
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public abstract class JspContext {
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/**
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* Sole constructor. (For invocation by subclass constructors,
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* typically implicit.)
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*/
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public JspContext() {
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// NOOP by default
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}
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/**
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* Register the name and value specified with page scope semantics.
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* If the value passed in is <code>null</code>, this has the same
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* effect as calling
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* <code>removeAttribute( name, PageContext.PAGE_SCOPE )</code>.
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*
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* @param name the name of the attribute to set
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* @param value the value to associate with the name, or null if the
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* attribute is to be removed from the page scope.
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* @throws NullPointerException if the name is null
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*/
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public abstract void setAttribute(String name, Object value);
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/**
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* Register the name and value specified with appropriate
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* scope semantics. If the value passed in is <code>null</code>,
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* this has the same effect as calling
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* <code>removeAttribute( name, scope )</code>.
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*
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* @param name the name of the attribute to set
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* @param value the object to associate with the name, or null if
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* the attribute is to be removed from the specified scope.
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* @param scope the scope with which to associate the name/object
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*
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* @throws NullPointerException if the name is null
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* @throws IllegalArgumentException if the scope is invalid
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* @throws IllegalStateException if the scope is
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* PageContext.SESSION_SCOPE but the page that was requested
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* does not participate in a session or the session has been
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* invalidated.
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*/
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public abstract void setAttribute(String name, Object value, int scope);
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/**
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* Returns the object associated with the name in the page scope or null
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* if not found.
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*
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* @param name the name of the attribute to get
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* @return the object associated with the name in the page scope
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* or null if not found.
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*
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* @throws NullPointerException if the name is null
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*/
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public abstract Object getAttribute(String name);
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/**
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* Return the object associated with the name in the specified
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* scope or null if not found.
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*
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* @param name the name of the attribute to set
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* @param scope the scope with which to associate the name/object
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* @return the object associated with the name in the specified
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* scope or null if not found.
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*
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* @throws NullPointerException if the name is null
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* @throws IllegalArgumentException if the scope is invalid
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* @throws IllegalStateException if the scope is
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* PageContext.SESSION_SCOPE but the page that was requested
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* does not participate in a session or the session has been
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* invalidated.
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*/
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public abstract Object getAttribute(String name, int scope);
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/**
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* Searches for the named attribute in page, request, session (if valid),
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* and application scope(s) in order and returns the value associated or
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* null.
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*
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* @param name the name of the attribute to search for
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* @return the value associated or null
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* @throws NullPointerException if the name is null
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*/
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public abstract Object findAttribute(String name);
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/**
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* Remove the object reference associated with the given name
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* from all scopes. Does nothing if there is no such object.
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*
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* @param name The name of the object to remove.
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* @throws NullPointerException if the name is null
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*/
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public abstract void removeAttribute(String name);
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/**
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* Remove the object reference associated with the specified name
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* in the given scope. Does nothing if there is no such object.
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*
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* @param name The name of the object to remove.
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* @param scope The scope where to look.
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* @throws IllegalArgumentException if the scope is invalid
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* @throws IllegalStateException if the scope is
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* PageContext.SESSION_SCOPE but the page that was requested
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* does not participate in a session or the session has been
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* invalidated.
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* @throws NullPointerException if the name is null
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*/
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public abstract void removeAttribute(String name, int scope);
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/**
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* Get the scope where a given attribute is defined.
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*
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* @param name the name of the attribute to return the scope for
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* @return the scope of the object associated with the name specified or 0
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* @throws NullPointerException if the name is null
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*/
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public abstract int getAttributesScope(String name);
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/**
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* Enumerate all the attributes in a given scope.
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*
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* @param scope the scope to enumerate all the attributes for
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* @return an enumeration of names (java.lang.String) of all the
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* attributes the specified scope
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* @throws IllegalArgumentException if the scope is invalid
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* @throws IllegalStateException if the scope is
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* PageContext.SESSION_SCOPE but the page that was requested
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* does not participate in a session or the session has been
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* invalidated.
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*/
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public abstract Enumeration<String> getAttributeNamesInScope(int scope);
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/**
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* The current value of the out object (a JspWriter).
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*
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* @return the current JspWriter stream being used for client response
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*/
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public abstract JspWriter getOut();
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/**
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* Provides programmatic access to the ExpressionEvaluator.
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* The JSP Container must return a valid instance of an
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* ExpressionEvaluator that can parse EL expressions.
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*
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* @return A valid instance of an ExpressionEvaluator.
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* @since 2.0
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* @deprecated As of JSP 2.1, replaced by
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* JspApplicationContext.getExpressionFactory()
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*/
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@SuppressWarnings("dep-ann") // TCK signature test fails with annotation
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public abstract javax.servlet.jsp.el.ExpressionEvaluator getExpressionEvaluator();
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public abstract ELContext getELContext();
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/**
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* Returns an instance of a VariableResolver that provides access to the
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* implicit objects specified in the JSP specification using this JspContext
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* as the context object.
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*
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* @return A valid instance of a VariableResolver.
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* @since 2.0
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* @deprecated As of JSP 2.1,
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* replaced by javax.el.ELContext.getELResolver()
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* which can be obtained by
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* jspContext.getELContext().getELResolver()
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*/
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@SuppressWarnings("dep-ann") // TCK signature test fails with annotation
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public abstract javax.servlet.jsp.el.VariableResolver getVariableResolver();
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/**
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* Return a new JspWriter object that sends output to the
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* provided Writer. Saves the current "out" JspWriter,
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* and updates the value of the "out" attribute in the
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* page scope attribute namespace of the JspContext.
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* <p>The returned JspWriter must implement all methods and
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* behave as though it were unbuffered. More specifically:
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* </p>
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* <ul>
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* <li>clear() must throw an IOException</li>
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* <li>clearBuffer() does nothing</li>
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* <li>getBufferSize() always returns 0</li>
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* <li>getRemaining() always returns 0</li>
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* </ul>
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*
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* @param writer The Writer for the returned JspWriter to send
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* output to.
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* @return a new JspWriter that writes to the given Writer.
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* @since 2.0
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*/
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public JspWriter pushBody( java.io.Writer writer ) {
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return null; // XXX to implement
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}
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/**
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* Return the previous JspWriter "out" saved by the matching
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* pushBody(), and update the value of the "out" attribute in
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* the page scope attribute namespace of the JspContext.
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*
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* @return the saved JspWriter.
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*/
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public JspWriter popBody() {
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return null; // XXX to implement
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}
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}
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