2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2016-2018 Ericsson. All rights reserved.
4 * Modifications Copyright (C) 2020-2021 Nordix Foundation.
5 * ================================================================================
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 * SPDX-License-Identifier: Apache-2.0
19 * ============LICENSE_END=========================================================
22 package org.onap.policy.gui.editors.apex.rest.handling.bean;
24 import java.lang.reflect.Field;
25 import java.lang.reflect.Method;
28 * The base class for Beans.
30 public abstract class BeanBase {
31 // Recurring string constants
32 private static final String PROBLEM_RETRIEVING_FIELD_PREFIX = "Problem retrieving field called ('";
33 private static final String JSON_BEAN_SUFFIX = "') from JSON bean ";
36 private static final int GET_LENGTH = 3;
39 * Gets a named field from the bean.
41 * @param field the field name
42 * @return the value for the field
44 public String get(final String field) {
45 // use getter preferably
46 for (final Method method : this.getClass().getMethods()) {
47 if (method.getName().startsWith("get") && method.getName().length() == (field.length() + GET_LENGTH)
48 && method.getName().toLowerCase().endsWith(field.toLowerCase())) {
49 return invokeGetterMethod(field, method);
56 final Field f = this.getClass().getDeclaredField(field);
58 return (String) (f.get(this));
59 } catch (final Exception e) {
60 throw new IllegalArgumentException(PROBLEM_RETRIEVING_FIELD_PREFIX + field + JSON_BEAN_SUFFIX + this,
64 throw new IllegalArgumentException(PROBLEM_RETRIEVING_FIELD_PREFIX + field + JSON_BEAN_SUFFIX + this);
68 * Invoke a getter method on a bean.
70 * @param field the field that the getter gets a value for
71 * @param method the method to invoke
73 private String invokeGetterMethod(final String field, final Method method) {
75 return (String) method.invoke(this);
76 } catch (final Exception e) {
77 throw new IllegalArgumentException(PROBLEM_RETRIEVING_FIELD_PREFIX + field + JSON_BEAN_SUFFIX + this, e);