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/*
* Copyright 2015 Open Networking Laboratory
*
* 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.
*/
package org.onosproject.net.flow.instructions;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
/**
* Abstract implementation of the set/get property methods of ExtensionInstruction.
*/
public abstract class AbstractExtensionInstruction implements ExtensionInstruction {
private static final String INVALID_KEY = "Invalid property key: ";
private static final String INVALID_TYPE = "Given type does not match field type: ";
@Override
public <T> void setPropertyValue(String key, T value) throws ExtensionPropertyException {
Class<?> clazz = this.getClass();
try {
Field field = clazz.getDeclaredField(key);
field.setAccessible(true);
field.set(this, value);
} catch (NoSuchFieldException | IllegalAccessException e) {
throw new ExtensionPropertyException(INVALID_KEY + key);
}
}
@Override
public <T> T getPropertyValue(String key) throws ExtensionPropertyException {
Class<?> clazz = this.getClass();
try {
Field field = clazz.getDeclaredField(key);
field.setAccessible(true);
@SuppressWarnings("unchecked")
T result = (T) field.get(this);
return result;
} catch (NoSuchFieldException | IllegalAccessException e) {
throw new ExtensionPropertyException(INVALID_KEY + key);
} catch (ClassCastException e) {
throw new ExtensionPropertyException(INVALID_TYPE + key);
}
}
@Override
public List<String> getProperties() {
Class<?> clazz = this.getClass();
List<String> fields = new ArrayList<>();
for (Field field : clazz.getDeclaredFields()) {
fields.add(field.getName());
}
return fields;
}
}
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