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package graphql;

import graphql.language.SourceLocation;

import java.util.Collections;

import java.util.List;

import java.util.Map;

/**

* A base class for graphql runtime exceptions that also implement {@link graphql.GraphQLError} and can be used

* in a general sense direct or have specialisations made of it.

* <p>

* This is aimed amongst other reasons at Kotlin consumers due to https://github.com/graphql-java/graphql-java/issues/1690

* as well as being a way to share common code.

*/

@PublicApi

public class GraphqlErrorException extends GraphQLException implements GraphQLError {

private final List<SourceLocation> locations;

private final Map<String, Object> extensions;

private final List<Object> path;

private final ErrorClassification errorClassification;

protected GraphqlErrorException(BuilderBase<?, ?> builder) {

super(builder.message, builder.cause);

this.locations = builder.sourceLocations;

this.extensions = builder.extensions;

this.path = builder.path;

this.errorClassification = builder.errorClassification;

}

@Override

public List<SourceLocation> getLocations() {

return locations;

}

@Override

public ErrorClassification getErrorType() {

return errorClassification;

}

@Override

public List<Object> getPath() {

return path;

}

@Override

public Map<String, Object> getExtensions() {

return extensions;

}

public static Builder newErrorException() {

return new Builder();

}

public static class Builder extends BuilderBase<Builder, GraphqlErrorException> {

public GraphqlErrorException build() {

return new GraphqlErrorException(this);

}

}

/**

* A trait like base class that contains the properties that GraphqlErrorException handles and can

* be used by other classes to derive their own builders.

*

* @param <T> the derived class

* @param <B> the class to be built

*/

protected abstract static class BuilderBase<T extends BuilderBase<T, B>, B extends GraphqlErrorException> {

protected String message;

protected Throwable cause;

protected ErrorClassification errorClassification = ErrorType.DataFetchingException;

protected List<SourceLocation> sourceLocations;

protected Map<String, Object> extensions;

protected List<Object> path;

private T asDerivedType() {

//noinspection unchecked

return (T) this;

}

public T message(String message) {

this.message = message;

return asDerivedType();

}

public T cause(Throwable cause) {

this.cause = cause;

return asDerivedType();

}

public T sourceLocation(SourceLocation sourceLocation) {

return sourceLocations(sourceLocation == null ? null : Collections.singletonList(sourceLocation));

}

public T sourceLocations(List<SourceLocation> sourceLocations) {

this.sourceLocations = sourceLocations;

return asDerivedType();

}

public T errorClassification(ErrorClassification errorClassification) {

this.errorClassification = errorClassification;

return asDerivedType();

}

public T path(List<Object> path) {

this.path = path;

return asDerivedType();

}

public T extensions(Map<String, Object> extensions) {

this.extensions = extensions;

return asDerivedType();

}

public abstract B build();

}

}