tomcat-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From jboy...@apache.org
Subject svn commit: r1026717 - /tomcat/taglibs/standard/trunk/impl/src/main/java/org/apache/taglibs/standard/util/ExpressionUtil.java
Date Sun, 24 Oct 2010 00:37:59 GMT
Author: jboynes
Date: Sun Oct 24 00:37:58 2010
New Revision: 1026717

URL: http://svn.apache.org/viewvc?rev=1026717&view=rev
Log:
Add helper class for working with javax.el expressions

Added:
    tomcat/taglibs/standard/trunk/impl/src/main/java/org/apache/taglibs/standard/util/ExpressionUtil.java

Added: tomcat/taglibs/standard/trunk/impl/src/main/java/org/apache/taglibs/standard/util/ExpressionUtil.java
URL: http://svn.apache.org/viewvc/tomcat/taglibs/standard/trunk/impl/src/main/java/org/apache/taglibs/standard/util/ExpressionUtil.java?rev=1026717&view=auto
==============================================================================
--- tomcat/taglibs/standard/trunk/impl/src/main/java/org/apache/taglibs/standard/util/ExpressionUtil.java
(added)
+++ tomcat/taglibs/standard/trunk/impl/src/main/java/org/apache/taglibs/standard/util/ExpressionUtil.java
Sun Oct 24 00:37:58 2010
@@ -0,0 +1,53 @@
+/*
+ * 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.taglibs.standard.util;
+
+import javax.el.ExpressionFactory;
+import javax.el.ValueExpression;
+import javax.servlet.jsp.JspApplicationContext;
+import javax.servlet.jsp.JspFactory;
+import javax.servlet.jsp.PageContext;
+
+/**
+ * Helper functions for working with EL expressions.
+ */
+public class ExpressionUtil {
+
+    /**
+     * Create a value expression.
+     *
+     * @param pageContext the context in which the expression will be parsed
+     * @param expression the expression
+     * @param expectedType the expected type of result
+     * @return a parsed expression
+     */
+    public static ValueExpression createValueExpression(PageContext pageContext, String expression,
Class<?> expectedType) {
+        ExpressionFactory factory = getExpressionFactory(pageContext);
+        return factory.createValueExpression(pageContext.getELContext(), expression, expectedType);
+    }
+
+    /**
+     * Return the JSP's ExpressionFactory.
+     *
+     * @param pageContext the context for the JSP
+     * @return the ExpressionFactory to use for EL expressions in that JSP
+     */
+    public static ExpressionFactory getExpressionFactory(PageContext pageContext) {
+        JspApplicationContext appContext = JspFactory.getDefaultFactory().getJspApplicationContext(pageContext.getServletContext());
+        return appContext.getExpressionFactory();
+    }
+}



---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@tomcat.apache.org
For additional commands, e-mail: dev-help@tomcat.apache.org


Mime
View raw message