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package graphql.execution.instrumentation;

import graphql.ExecutionResult;
import graphql.PublicApi;
import graphql.execution.instrumentation.parameters.InstrumentationExecuteOperationParameters;
import graphql.execution.instrumentation.parameters.InstrumentationExecutionParameters;
import graphql.execution.instrumentation.parameters.InstrumentationExecutionStrategyParameters;
import graphql.execution.instrumentation.parameters.InstrumentationFieldFetchParameters;
import graphql.execution.instrumentation.parameters.InstrumentationFieldParameters;
import graphql.execution.instrumentation.parameters.InstrumentationValidationParameters;
import graphql.language.Document;
import graphql.validation.ValidationError;

import java.util.List;
import java.util.concurrent.CompletableFuture;

/**
 * An implementation of {@link graphql.execution.instrumentation.Instrumentation} that does nothing.  It can be used
 * as a base for derived classes where you only implement the methods you want to
 */
@PublicApi
public class SimpleInstrumentation implements Instrumentation {

    /**
     * A singleton instance of a {@link graphql.execution.instrumentation.Instrumentation} that does nothing
     */
    public static final SimpleInstrumentation INSTANCE = new SimpleInstrumentation();

    @Override
    public InstrumentationContext beginExecution(InstrumentationExecutionParameters parameters) {
        return SimpleInstrumentationContext.noOp();
    }

    @Override
    public InstrumentationContext beginParse(InstrumentationExecutionParameters parameters) {
        return SimpleInstrumentationContext.noOp();
    }

    @Override
    public InstrumentationContext> beginValidation(InstrumentationValidationParameters parameters) {
        return SimpleInstrumentationContext.noOp();
    }

    @Override
    public ExecutionStrategyInstrumentationContext beginExecutionStrategy(InstrumentationExecutionStrategyParameters parameters) {
        return new ExecutionStrategyInstrumentationContext() {
            @Override
            public void onDispatched(CompletableFuture result) {

            }

            @Override
            public void onCompleted(ExecutionResult result, Throwable t) {

            }
        };
    }

    @Override
    public InstrumentationContext beginExecuteOperation(InstrumentationExecuteOperationParameters parameters) {
        return SimpleInstrumentationContext.noOp();
    }

    @Override
    public InstrumentationContext beginField(InstrumentationFieldParameters parameters) {
        return SimpleInstrumentationContext.noOp();
    }

    @Override
    public InstrumentationContext