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java/javax/el/BeanNameResolver.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;
+
+/**
+ * Base implementation that provides a minimal default implementation that is
+ * intended to be extended by application developers.
+ *
+ * @since EL 3.0
+ */
+public abstract class BeanNameResolver {
+
+    /**
+     * Can this resolver resolve the given bean name?
+     *
+     * @param beanName The bean name to resolve
+     *
+     * @return This default implementation always returns <code>false</code>
+     */
+    public boolean isNameResolved(String beanName) {
+        return false;
+    }
+
+
+    /**
+     * Returns the named bean.
+     *
+     * @param beanName The bean name to return
+     *
+     * @return This default implementation always returns <code>null</code>
+     */
+    public Object getBean(String beanName) {
+        return null;
+    }
+
+
+    /**
+     * Sets a value of a bean of the given name. If the named bean does not
+     * exist and {@link #canCreateBean} returns <code>true</code> then a bean
+     * is created with the given value.
+     *
+     * @param beanName The name of the bean to be set/create
+     * @param value    The value of the bean to set/create
+     *
+     * @throws PropertyNotWritableException if the bean is read only
+     */
+    public void setBeanValue(String beanName, Object value)
+            throws PropertyNotWritableException {
+        throw new PropertyNotWritableException();
+    }
+
+
+    /**
+     * Is the named bean read-only?
+     *
+     * @param beanName The name of the bean of interest
+     *
+     * @return <code>true</code> if the bean is read only, otherwise
+     *         <code>false</code>
+     */
+    public boolean isReadOnly(String beanName) {
+        return true;
+    }
+
+
+    /**
+     * Is it permitted to create a bean of the given name?
+     *
+     * @param beanName The name of the bean of interest
+     *
+     * @return <code>true</code> if the bean may be created, otherwise
+     *         <code>false</code>
+     */
+    public boolean canCreateBean(String beanName) {
+        return false;
+    }
+}