com.division.jsonrpc.api.SuperclassExclusionStrategy.java Source code

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Here is the source code for com.division.jsonrpc.api.SuperclassExclusionStrategy.java

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/*
 *Copyright 2014 Evan Cleary.
 *
 *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 com.division.jsonrpc.api;

import com.google.gson.ExclusionStrategy;
import com.google.gson.FieldAttributes;

import java.lang.reflect.Field;

/**
 * Allows for classes to override their superclass'
 * fields and be properly output by the GSON engine.
 */
public class SuperclassExclusionStrategy implements ExclusionStrategy {
    public boolean shouldSkipClass(Class<?> arg0) {
        return false;
    }

    public boolean shouldSkipField(FieldAttributes fieldAttributes) {
        String fieldName = fieldAttributes.getName();
        Class<?> theClass = fieldAttributes.getDeclaringClass();

        return isFieldInSuperclass(theClass, fieldName);
    }

    private boolean isFieldInSuperclass(Class<?> subclass, String fieldName) {
        Class<?> superclass = subclass.getSuperclass();
        Field field;

        while (superclass != null) {
            field = getField(superclass, fieldName);

            if (field != null)
                return true;

            superclass = superclass.getSuperclass();
        }

        return false;
    }

    private Field getField(Class<?> theClass, String fieldName) {
        try {
            return theClass.getDeclaredField(fieldName);
        } catch (Exception e) {
            return null;
        }
    }
}