graphql.annotations.dataFetchers.RelayMutationMethodDataFetcher Maven / Gradle / Ivy

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/**
 * Copyright 2016 Yurii Rashkovskii
 *
 * 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
 */
package graphql.annotations.dataFetchers;

import graphql.schema.*;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class RelayMutationMethodDataFetcher implements DataFetcher {
    private final Method method;
    private final List args;
    private final GraphQLInputType input;
    private final GraphQLOutputType type;
    private final int envIndex;

    public RelayMutationMethodDataFetcher(Method method, List args, GraphQLInputType input, GraphQLOutputType type) {
        this.method = method;
        this.args = args;
        this.input = input;
        this.type = type;
        List> parameterTypes = Arrays.asList(method.getParameters()).stream().
                map(Parameter::getType).
                collect(Collectors.toList());
        envIndex = parameterTypes.indexOf(DataFetchingEnvironment.class);
    }

    @Override
    public Object get(DataFetchingEnvironment environment) {
        if (environment.getSource() == null) return null;
        try {
            Map input = environment.getArgument("input");
            List