1 /*
2 * Copyright 2014-2020 the original author or authors.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.springframework.data.spel;
17
18 import org.springframework.expression.EvaluationContext;
19 import org.springframework.expression.spel.support.StandardEvaluationContext;
20
21 /**
22 * Provides a way to access a centrally defined potentially shared {@link StandardEvaluationContext}.
23 *
24 * @author Thomas Darimont
25 * @author Oliver Gierke
26 * @author Christoph Strobl
27 * @since 2.1
28 */
29 public interface EvaluationContextProvider {
30
31 /**
32 * A simple default {@link EvaluationContextProvider} returning a {@link StandardEvaluationContext} with the given
33 * root object.
34 */
35 static EvaluationContextProvider DEFAULT = rootObject -> rootObject == null //
36 ? new StandardEvaluationContext() //
37 : new StandardEvaluationContext(rootObject);
38
39 /**
40 * Returns an {@link EvaluationContext} built using the given parameter values.
41 *
42 * @param rootObject the root object to set in the {@link EvaluationContext}.
43 * @return
44 */
45 EvaluationContext getEvaluationContext(Object rootObject);
46 }
47