com.addthis.codec.jackson.CodecBeanDeserializerModifier.java Source code

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Here is the source code for com.addthis.codec.jackson.CodecBeanDeserializerModifier.java

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/*
 * 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.addthis.codec.jackson;

import java.util.Iterator;

import com.fasterxml.jackson.databind.BeanDescription;
import com.fasterxml.jackson.databind.DeserializationConfig;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.deser.BeanDeserializerBase;
import com.fasterxml.jackson.databind.deser.BeanDeserializerModifier;
import com.fasterxml.jackson.databind.deser.SettableBeanProperty;
import com.fasterxml.jackson.databind.deser.std.EnumDeserializer;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.util.EnumResolver;
import com.typesafe.config.Config;
import com.typesafe.config.ConfigValue;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class CodecBeanDeserializerModifier extends BeanDeserializerModifier {
    private static final Logger log = LoggerFactory.getLogger(CodecBeanDeserializerModifier.class);

    private final Config globalDefaults;
    private final boolean modifyEnum;

    public CodecBeanDeserializerModifier(Config globalDefaults) {
        this.globalDefaults = globalDefaults;
        this.modifyEnum = globalDefaults.getBoolean("addthis.codec.jackson.ignore.enum-case");
    }

    @Override
    public JsonDeserializer<?> modifyDeserializer(DeserializationConfig config, BeanDescription beanDesc,
            JsonDeserializer<?> deserializer) {
        JsonDeserializer<?> delegatee = deserializer.getDelegatee();
        if (delegatee != null) {
            JsonDeserializer<?> replacementDelegatee = modifyDeserializer(config, beanDesc, delegatee);
            return deserializer.replaceDelegatee(replacementDelegatee);
        } else if (deserializer instanceof BeanDeserializerBase) {
            BeanDeserializerBase beanDeserializer = (BeanDeserializerBase) deserializer;
            ObjectNode fieldDefaults = config.getNodeFactory().objectNode();
            Iterator<SettableBeanProperty> propertyIterator = beanDeserializer.properties();
            while (propertyIterator.hasNext()) {
                SettableBeanProperty prop = propertyIterator.next();
                Class<?> declaringClass = prop.getMember().getDeclaringClass();
                String canonicalClassName = declaringClass.getCanonicalName();
                if ((canonicalClassName != null) && globalDefaults.hasPath(canonicalClassName)) {
                    Config declarerDefaults = globalDefaults.getConfig(canonicalClassName);
                    String propertyName = prop.getName();
                    if (declarerDefaults.hasPath(propertyName)) {
                        ConfigValue defaultValue = declarerDefaults.getValue(propertyName);
                        JsonNode fieldDefault = Jackson.configConverter(defaultValue);
                        fieldDefaults.set(propertyName, fieldDefault);
                    }
                }
            }
            return new CodecBeanDeserializer(beanDeserializer, fieldDefaults);
        } else {
            return deserializer;
        }
    }

    @Override
    public JsonDeserializer<?> modifyEnumDeserializer(DeserializationConfig config, JavaType type,
            BeanDescription beanDesc, JsonDeserializer<?> deserializer) {
        JsonDeserializer<?> delegatee = deserializer.getDelegatee();
        if (delegatee != null) {
            JsonDeserializer<?> replacementDelegatee = modifyEnumDeserializer(config, type, beanDesc, delegatee);
            return deserializer.replaceDelegatee(replacementDelegatee);
        } else if (modifyEnum && deserializer.getClass().equals(EnumDeserializer.class)) {
            EnumResolver enumResolver = EnumResolver.constructUnsafe(type.getRawClass(),
                    config.getAnnotationIntrospector());
            return new CaseIgnoringEnumDeserializer(enumResolver);
        } else {
            return deserializer;
        }
    }
}