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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* ================================================================================
* Licensed 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.apex.client.editor.rest.bean;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
/**
* The base class for Beans.
*/
public abstract class BeanBase {
// Recurring string constants
private static final String PROBLEM_RETRIEVING_FIELD_PREFIX = "Problem retrieving field called ('";
private static final String JSON_BEAN_SUFFIX = "') from JSON bean ";
/**
* Gets a named field from the bean.
*
* @param field the field name
* @return the value for the field
*/
public String get(final String field) {
// CHECKSTYLE:OFF: MagicNumber
// use getter preferably
for (final Method method : this.getClass().getMethods()) {
if ((method.getName().startsWith("get")) && (method.getName().length() == (field.length() + 3))) {
if (method.getName().toLowerCase().endsWith(field.toLowerCase())) {
try {
return (String) method.invoke(this);
} catch (final Exception e) {
throw new IllegalArgumentException(
PROBLEM_RETRIEVING_FIELD_PREFIX + field + JSON_BEAN_SUFFIX + this, e);
}
}
}
}
// Use field approach
if (field != null) {
try {
final Field f = this.getClass().getDeclaredField(field);
if (f != null) {
f.setAccessible(true);
return (String) (f.get(this));
}
} catch (final Exception e) {
throw new IllegalArgumentException(
PROBLEM_RETRIEVING_FIELD_PREFIX + field + JSON_BEAN_SUFFIX + this, e);
}
}
throw new IllegalArgumentException(PROBLEM_RETRIEVING_FIELD_PREFIX + field + JSON_BEAN_SUFFIX + this);
}
}
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