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java/javax/el/ELManager.java

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+/*
+ * 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 javax.el;
+
+import java.lang.reflect.Method;
+import java.util.Map;
+
+/**
+ * @since EL 3.0
+ */
+public class ELManager {
+
+    private StandardELContext context = null;
+
+    public static ExpressionFactory getExpressionFactory() {
+        return Util.getExpressionFactory();
+    }
+
+    public StandardELContext getELContext() {
+        if (context == null) {
+            context = new StandardELContext(getExpressionFactory());
+        }
+
+        return context;
+    }
+
+    public ELContext setELContext(ELContext context) {
+        StandardELContext oldContext = this.context;
+        this.context = new StandardELContext(context);
+        return oldContext;
+    }
+
+    public void addBeanNameResolver(BeanNameResolver beanNameResolver) {
+        getELContext().addELResolver(new BeanNameELResolver(beanNameResolver));
+    }
+
+    public void addELResolver(ELResolver resolver) {
+        getELContext().addELResolver(resolver);
+    }
+
+    public void mapFunction(String prefix, String function, Method method) {
+        getELContext().getFunctionMapper().mapFunction(
+                prefix, function, method);
+    }
+
+    public void setVariable(String variable, ValueExpression expression) {
+        getELContext().getVariableMapper().setVariable(variable, expression);
+    }
+
+    public void importStatic(String staticMemberName)
+            throws javax.el.ELException {
+        getELContext().getImportHandler().importStatic(staticMemberName);
+    }
+
+    public void importClass(String className) throws javax.el.ELException {
+        getELContext().getImportHandler().importClass(className);
+    }
+
+    public void importPackage(String packageName) {
+        getELContext().getImportHandler().importPackage(packageName);
+    }
+
+    public Object defineBean(String name, Object bean) {
+        Map<String,Object> localBeans = getELContext().getLocalBeans();
+
+        if (bean == null) {
+            return localBeans.remove(name);
+        } else {
+            return localBeans.put(name, bean);
+        }
+    }
+
+    public void addEvaluationListener(EvaluationListener listener) {
+        getELContext().addEvaluationListener(listener);
+    }
+}