io.gsonfire.postprocessors.methodinvoker.MethodInvokerPostProcessor Maven / Gradle / Ivy

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A java library that adds some very useful features to Gson, like Date serializing to unix timestamp or RFC3339, method (getter) serialization, pre and post processors and many more. Check out the documentation to learn how to use it!

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package io.gsonfire.postprocessors.methodinvoker;

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import io.gsonfire.PostProcessor;
import io.gsonfire.annotations.ExposeMethodResult;
import io.gsonfire.gson.FireExclusionStrategy;
import io.gsonfire.gson.FireExclusionStrategyComposite;

import java.lang.reflect.InvocationTargetException;

/**
 * @autor: julio
 */
public final class MethodInvokerPostProcessor implements PostProcessor {

    private static MappedMethodInspector methodInspector = new MappedMethodInspector();

    private final FireExclusionStrategy serializationExclusionStrategy;

    public MethodInvokerPostProcessor() {
        this(new FireExclusionStrategyComposite());
    }

    public MethodInvokerPostProcessor(FireExclusionStrategy serializationExclusionStrategy) {
        this.serializationExclusionStrategy = serializationExclusionStrategy;
    }

    @Override
    public void postDeserialize(T result, JsonElement src, Gson gson) {
        //nothing here
    }

    @Override
    public void postSerialize(JsonElement result, T src, Gson gson) {
        if(result.isJsonObject()){
            JsonObject jsonObject = result.getAsJsonObject();
            for(MappedMethod m: methodInspector.getAnnotatedMembers(src.getClass(), ExposeMethodResult.class)){
                if(!serializationExclusionStrategy.shouldSkipMethod(m)) {
                    try {
                        if (m.getConflictResolutionStrategy() == ExposeMethodResult.ConflictResolutionStrategy.OVERWRITE || (m.getConflictResolutionStrategy() == ExposeMethodResult.ConflictResolutionStrategy.SKIP && !jsonObject.has(m.getSerializedName()))) {
                            Object value = m.getMethod().invoke(src);
                            jsonObject.add(m.getSerializedName(), gson.toJsonTree(value));
                        }
                    } catch (IllegalAccessException e) {
                        e.printStackTrace();
                    } catch (InvocationTargetException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }

}