001: /*
002: * The Apache Software License, Version 1.1
003: *
004: * Copyright (c) 1999 The Apache Software Foundation. All rights
005: * reserved.
006: *
007: * Redistribution and use in source and binary forms, with or without
008: * modification, are permitted provided that the following conditions
009: * are met:
010: *
011: * 1. Redistributions of source code must retain the above copyright
012: * notice, this list of conditions and the following disclaimer.
013: *
014: * 2. Redistributions in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * 3. The end-user documentation included with the redistribution, if
020: * any, must include the following acknowlegement:
021: * "This product includes software developed by the
022: * Apache Software Foundation (http://www.apache.org/)."
023: * Alternately, this acknowlegement may appear in the software itself,
024: * if and wherever such third-party acknowlegements normally appear.
025: *
026: * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
027: * Foundation" must not be used to endorse or promote products derived
028: * from this software without prior written permission. For written
029: * permission, please contact apache@apache.org.
030: *
031: * 5. Products derived from this software may not be called "Apache"
032: * nor may "Apache" appear in their names without prior written
033: * permission of the Apache Group.
034: *
035: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
036: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046: * SUCH DAMAGE.
047: * ====================================================================
048: *
049: * This software consists of voluntary contributions made by many
050: * individuals on behalf of the Apache Software Foundation. For more
051: * information on the Apache Software Foundation, please see
052: * <http://www.apache.org/>.
053: *
054: */
055:
056: package org.apache.commons.el;
057:
058: import javax.servlet.jsp.PageContext;
059: import javax.servlet.jsp.el.VariableResolver;
060: import javax.servlet.jsp.el.ELException;
061:
062: /**
063: *
064: * <p>This is the JSTL-specific implementation of VariableResolver.
065: * It looks up variable references in the PageContext, and also
066: * recognizes references to implicit objects.
067: *
068: * @author Nathan Abramson - Art Technology Group
069: * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
070: **/
071:
072: public class VariableResolverImpl implements VariableResolver {
073: //-------------------------------------
074: // Member variables
075: //-------------------------------------
076:
077: private PageContext mCtx;
078:
079: //-------------------------------------
080: /**
081: *
082: * Constructor
083: **/
084: public VariableResolverImpl(PageContext pCtx) {
085: mCtx = pCtx;
086: }
087:
088: //-------------------------------------
089: /**
090: *
091: * Resolves the specified variable within the given context.
092: * Returns null if the variable is not found.
093: **/
094: public Object resolveVariable(String pName) throws ELException {
095: // Check for implicit objects
096: if ("pageContext".equals(pName)) {
097: return mCtx;
098: } else if ("pageScope".equals(pName)) {
099: return ImplicitObjects.getImplicitObjects(mCtx)
100: .getPageScopeMap();
101: } else if ("requestScope".equals(pName)) {
102: return ImplicitObjects.getImplicitObjects(mCtx)
103: .getRequestScopeMap();
104: } else if ("sessionScope".equals(pName)) {
105: return ImplicitObjects.getImplicitObjects(mCtx)
106: .getSessionScopeMap();
107: } else if ("applicationScope".equals(pName)) {
108: return ImplicitObjects.getImplicitObjects(mCtx)
109: .getApplicationScopeMap();
110: } else if ("param".equals(pName)) {
111: return ImplicitObjects.getImplicitObjects(mCtx)
112: .getParamMap();
113: } else if ("paramValues".equals(pName)) {
114: return ImplicitObjects.getImplicitObjects(mCtx)
115: .getParamsMap();
116: } else if ("header".equals(pName)) {
117: return ImplicitObjects.getImplicitObjects(mCtx)
118: .getHeaderMap();
119: } else if ("headerValues".equals(pName)) {
120: return ImplicitObjects.getImplicitObjects(mCtx)
121: .getHeadersMap();
122: } else if ("initParam".equals(pName)) {
123: return ImplicitObjects.getImplicitObjects(mCtx)
124: .getInitParamMap();
125: } else if ("cookie".equals(pName)) {
126: return ImplicitObjects.getImplicitObjects(mCtx)
127: .getCookieMap();
128: }
129:
130: // Otherwise, just look it up in the page context
131: else {
132: return mCtx.findAttribute(pName);
133: }
134: }
135:
136: //-------------------------------------
137: }
|