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package graphql;

import com.google.common.collect.ImmutableList;

import graphql.collect.ImmutableKit;

import java.util.ArrayList;

import java.util.Collections;

import java.util.LinkedHashMap;

import java.util.List;

import java.util.Map;

import java.util.function.Consumer;

import static graphql.collect.ImmutableKit.map;

@Internal

public class ExecutionResultImpl implements ExecutionResult {

private final List<GraphQLError> errors;

private final Object data;

private final transient Map<Object, Object> extensions;

private final transient boolean dataPresent;

public ExecutionResultImpl(GraphQLError error) {

this(false, null, Collections.singletonList(error), null);

}

public ExecutionResultImpl(List<? extends GraphQLError> errors) {

this(false, null, errors, null);

}

public ExecutionResultImpl(Object data, List<? extends GraphQLError> errors) {

this(true, data, errors, null);

}

public ExecutionResultImpl(Object data, List<? extends GraphQLError> errors, Map<Object, Object> extensions) {

this(true, data, errors, extensions);

}

public ExecutionResultImpl(ExecutionResultImpl other) {

this(other.dataPresent, other.data, other.errors, other.extensions);

}

private ExecutionResultImpl(boolean dataPresent, Object data, List<? extends GraphQLError> errors, Map<Object, Object> extensions) {

this.dataPresent = dataPresent;

this.data = data;

if (errors != null) {

this.errors = ImmutableList.copyOf(errors);

} else {

this.errors = ImmutableKit.emptyList();

}

this.extensions = extensions;

}

public boolean isDataPresent() {

return dataPresent;

}

@Override

public List<GraphQLError> getErrors() {

return errors;

}

@Override

@SuppressWarnings("TypeParameterUnusedInFormals")

public <T> T getData() {

//noinspection unchecked

return (T) data;

}

@Override

public Map<Object, Object> getExtensions() {

return extensions;

}

@Override

public Map<String, Object> toSpecification() {

Map<String, Object> result = new LinkedHashMap<>();

if (errors != null && !errors.isEmpty()) {

result.put("errors", errorsToSpec(errors));

}

if (dataPresent) {

result.put("data", data);

}

if (extensions != null) {

result.put("extensions", extensions);

}

return result;

}

private Object errorsToSpec(List<GraphQLError> errors) {

return map(errors, GraphQLError::toSpecification);

}

@Override

public String toString() {

return "ExecutionResultImpl{" +

"errors=" + errors +

", data=" + data +

", dataPresent=" + dataPresent +

", extensions=" + extensions +

'}';

}

public ExecutionResultImpl transform(Consumer<Builder> builderConsumer) {

Builder builder = newExecutionResult().from(this);

builderConsumer.accept(builder);

return builder.build();

}

public static Builder newExecutionResult() {

return new Builder();

}

public static class Builder {

private boolean dataPresent;

private Object data;

private List<GraphQLError> errors = new ArrayList<>();

private Map<Object, Object> extensions;

public Builder from(ExecutionResult executionResult) {

dataPresent = executionResult.isDataPresent();

data = executionResult.getData();

errors = new ArrayList<>(executionResult.getErrors());

extensions = executionResult.getExtensions();

return this;

}

public Builder data(Object data) {

dataPresent = true;

this.data = data;

return this;

}

public Builder errors(List<GraphQLError> errors) {

this.errors = errors;

return this;

}

public Builder addErrors(List<GraphQLError> errors) {

this.errors.addAll(errors);

return this;

}

public Builder addError(GraphQLError error) {

this.errors.add(error);

return this;

}

public Builder extensions(Map<Object, Object> extensions) {

this.extensions = extensions;

return this;

}

public Builder addExtension(String key, Object value) {

this.extensions = (this.extensions == null ? new LinkedHashMap<>() : this.extensions);

this.extensions.put(key, value);

return this;

}

public ExecutionResultImpl build() {

return new ExecutionResultImpl(dataPresent, data, errors, extensions);

}

}

}