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java/javax/el/MethodExpression.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;
+
+public abstract class MethodExpression extends Expression {
+
+    private static final long serialVersionUID = 8163925562047324656L;
+
+    /**
+     * @param context The EL context for this evaluation
+     *
+     * @return Information about the method that this expression resolves to
+     *
+     * @throws NullPointerException
+     *              If the supplied context is <code>null</code>
+     * @throws PropertyNotFoundException
+     *              If a property/variable resolution failed because no match
+     *              was found or a match was found but was not readable
+     * @throws MethodNotFoundException
+     *              If no matching method can be found
+     * @throws ELException
+     *              Wraps any exception throw whilst resolving the property
+     */
+    public abstract MethodInfo getMethodInfo(ELContext context);
+
+    /**
+     * @param context The EL context for this evaluation
+     * @param params  The parameters with which to invoke this method expression
+     *
+     * @return The result of invoking this method expression
+     *
+     * @throws NullPointerException
+     *              If the supplied context is <code>null</code>
+     * @throws PropertyNotFoundException
+     *              If a property/variable resolution failed because no match
+     *              was found or a match was found but was not readable
+     * @throws MethodNotFoundException
+     *              If no matching method can be found
+     * @throws ELException
+     *              Wraps any exception throw whilst resolving the property or
+     *              coercion of the result to the expected return type fails
+     */
+    public abstract Object invoke(ELContext context, Object[] params);
+
+    /**
+     * @return This default implementation always returns <code>false</code>
+     * @since EL 3.0
+     */
+    public boolean isParametersProvided() {
+        // Expected to be over-ridden by implementation
+        return false;
+    }
+
+    /**
+     * @since EL 2.2
+     *
+     * Note: The spelling mistake is deliberate.
+     * isParmetersProvided()  - Specification definition
+     * isParametersProvided() - Corrected spelling
+     *
+     * @return Always <code>false</code>
+     *
+     * @deprecated  Use {@link #isParametersProvided()}
+     */
+    @Deprecated
+    public boolean isParmetersProvided() {
+        // Expected to be over-ridden by implementation
+        return false;
+    }
+}