com.unboundid.scim2.common.utils.JsonRefBeanSerializer.java Source code

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Here is the source code for com.unboundid.scim2.common.utils.JsonRefBeanSerializer.java

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/*
 * Copyright 2015-2017 UnboundID Corp.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (GPLv2 only)
 * or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses>.
 */

package com.unboundid.scim2.common.utils;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.unboundid.scim2.common.types.JsonReference;

import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.io.IOException;
import java.lang.reflect.Field;
import java.util.Collection;

/**
 * Serializes classes that are beans, but the underlying structure holding
 * the attribute values is a JsonReference object.  This will preserve those
 * values, so that if a value was explicitly set to null, we will know that,
 * but if not, we will know it was never set.  During serialization, we will
 * serialize "{@code null}" values, but not serialize never set values.
 */
public class JsonRefBeanSerializer extends JsonSerializer<Object> {
    /**
     * {@inheritDoc}
     */
    @Override
    public void serialize(final Object value, final JsonGenerator gen, final SerializerProvider serializers)
            throws IOException {
        Class<?> clazz = value.getClass();
        try {
            gen.writeStartObject();
            Collection<PropertyDescriptor> propertyDescriptors = SchemaUtils.getPropertyDescriptors(clazz);
            for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
                Field field = SchemaUtils.findField(clazz, propertyDescriptor.getName());
                if (field == null) {
                    continue;
                }
                field.setAccessible(true);
                Object obj = field.get(value);
                if (obj instanceof JsonReference) {
                    JsonReference<?> reference = (JsonReference<?>) obj;
                    if (reference.isSet()) {
                        gen.writeFieldName(field.getName());
                        serializers.defaultSerializeValue(reference.getObj(), gen);
                    }
                }
            }
            gen.writeEndObject();
        } catch (IntrospectionException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }

    }
}