io.gsonfire.gson.HooksInvoker Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of gson-fire Show documentation

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!

There is a newer version: 1.9.0

Show newest version

package io.gsonfire.gson;

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import io.gsonfire.annotations.PostDeserialize;
import io.gsonfire.annotations.PreSerialize;
import io.gsonfire.util.reflection.AbstractMethodInspector;
import io.gsonfire.util.reflection.MethodInvoker;

import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

/**
 * @autor: julio
 */
public final class HooksInvoker {

    private static final Set SUPPORTED_TYPES = new HashSet(Arrays.asList(
        JsonElement.class,
        Gson.class
    ));

    private AbstractMethodInspector inspector = new AbstractMethodInspector() {
        @Override
        protected MethodInvoker map(Method member) {
            return new MethodInvoker(member, SUPPORTED_TYPES) ;
        }
    };

    public HooksInvoker(){

    }

    public void preSerialize(Object obj){
        invokeAll(obj, PreSerialize.class, null, null);
    }

    public void postDeserialize(Object obj, JsonElement jsonElement, Gson gson){
        invokeAll(obj, PostDeserialize.class, jsonElement, gson);
    }

    private void invokeAll(Object obj, Class annotation, JsonElement jsonElement, Gson gson){
        if(obj != null) {
            for (MethodInvoker m : inspector.getAnnotatedMembers(obj.getClass(), annotation)) {
                try {
                    m.invoke(obj, new HooksInvokerValueSupplier(jsonElement, gson));
                } catch (IllegalAccessException e) {
                    throw new HookInvocationException("Exception during hook invocation: " + annotation.getSimpleName(), e);
                } catch (InvocationTargetException e) {
                    throw new HookInvocationException("Exception during hook invocation: " + annotation.getSimpleName(), e.getTargetException());
                }
            }
        }
    }

    private static class HooksInvokerValueSupplier implements MethodInvoker.ValueSupplier {

        private final JsonElement jsonElement;
        private final Gson gson;

        private HooksInvokerValueSupplier(JsonElement jsonElement, Gson gson) {
            this.jsonElement = jsonElement;
            this.gson = gson;
        }

        @Override
        public Object getValueForType(Class type) {
            if(type == JsonElement.class) {
                return jsonElement;
            } else if (type == Gson.class) {
                return gson;
            } else {
                return null;
            }
        }
    }

}