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();
+ }
+}
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