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package graphql;
import graphql.execution.Execution;
import graphql.execution.ExecutionId;
import graphql.execution.ExecutionIdProvider;
import graphql.execution.ExecutionStrategy;
import graphql.execution.SimpleExecutionStrategy;
import graphql.language.Document;
import graphql.language.SourceLocation;
import graphql.parser.Parser;
import graphql.schema.GraphQLSchema;
import graphql.validation.ValidationError;
import graphql.validation.Validator;
import org.antlr.v4.runtime.RecognitionException;
import org.antlr.v4.runtime.misc.ParseCancellationException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import static graphql.Assert.assertNotNull;
public class GraphQL {
private static final Logger log = LoggerFactory.getLogger(GraphQL.class);
private static final ExecutionIdProvider DEFAULT_EXECUTION_ID_PROVIDER = new ExecutionIdProvider() {
@Override
public ExecutionId provide(String query, String operationName, Object context) {
return ExecutionId.generate();
}
};
private final GraphQLSchema graphQLSchema;
private final ExecutionStrategy queryStrategy;
private final ExecutionStrategy mutationStrategy;
private final ExecutionIdProvider idProvider;
/**
* A GraphQL object ready to execute queries
*
* @param graphQLSchema the schema to use
*
* @deprecated use the {@link #newGraphQL(GraphQLSchema)} builder instead. This will be removed in a future version.
*/
public GraphQL(GraphQLSchema graphQLSchema) {
//noinspection deprecation
this(graphQLSchema, null, null);
}
/**
* A GraphQL object ready to execute queries
*
* @param graphQLSchema the schema to use
* @param queryStrategy the query execution strategy to use
*
* @deprecated use the {@link #newGraphQL(GraphQLSchema)} builder instead. This will be removed in a future version.
*/
public GraphQL(GraphQLSchema graphQLSchema, ExecutionStrategy queryStrategy) {
//noinspection deprecation
this(graphQLSchema, queryStrategy, null);
}
/**
* A GraphQL object ready to execute queries
*
* @param graphQLSchema the schema to use
* @param queryStrategy the query execution strategy to use
* @param mutationStrategy the mutation execution strategy to use
*
* @deprecated use the {@link #newGraphQL(GraphQLSchema)} builder instead. This will be removed in a future version.
*/
public GraphQL(GraphQLSchema graphQLSchema, ExecutionStrategy queryStrategy, ExecutionStrategy mutationStrategy) {
this(graphQLSchema,queryStrategy,mutationStrategy, DEFAULT_EXECUTION_ID_PROVIDER);
}
private GraphQL(GraphQLSchema graphQLSchema, ExecutionStrategy queryStrategy, ExecutionStrategy mutationStrategy, ExecutionIdProvider idProvider) {
this.graphQLSchema = assertNotNull(graphQLSchema,"queryStrategy must be non null");
this.queryStrategy = assertNotNull(queryStrategy, "queryStrategy must be non null");
this.idProvider = assertNotNull(idProvider, "idProvider must be non null");
this.mutationStrategy = mutationStrategy;
}
/**
* Helps you build a GraphQL object ready to execute queries
*
* @param graphQLSchema the schema to use
*
* @return a builder of GraphQL objects
*/
public static Builder newGraphQL(GraphQLSchema graphQLSchema) {
return new Builder(graphQLSchema);
}
public static class Builder {
private GraphQLSchema graphQLSchema;
private ExecutionStrategy queryExecutionStrategy = new SimpleExecutionStrategy();
private ExecutionStrategy mutationExecutionStrategy = new SimpleExecutionStrategy();
private ExecutionIdProvider idProvider = DEFAULT_EXECUTION_ID_PROVIDER;
public Builder(GraphQLSchema graphQLSchema) {
this.graphQLSchema = graphQLSchema;
}
public Builder schema(GraphQLSchema graphQLSchema) {
this.graphQLSchema = assertNotNull(graphQLSchema, "GraphQLSchema must be non null");
return this;
}
public Builder queryExecutionStrategy(ExecutionStrategy executionStrategy) {
this.queryExecutionStrategy = assertNotNull(executionStrategy, "Query ExecutionStrategy must be non null");
return this;
}
public Builder mutationExecutionStrategy(ExecutionStrategy executionStrategy) {
this.mutationExecutionStrategy = assertNotNull(executionStrategy, "Mutation ExecutionStrategy must be non null");
return this;
}
public Builder executionIdProvider(ExecutionIdProvider executionIdProvider) {
this.idProvider = assertNotNull(executionIdProvider, "ExecutionIdProvider must be non null");
return this;
}
public GraphQL build() {
return new GraphQL(graphQLSchema, queryExecutionStrategy, mutationExecutionStrategy, idProvider);
}
}
public ExecutionResult execute(String requestString) {
return execute(requestString, null);
}
public ExecutionResult execute(String requestString, Object context) {
return execute(requestString, context, Collections.<String, Object>emptyMap());
}
public ExecutionResult execute(String requestString, String operationName, Object context) {
return execute(requestString, operationName, context, Collections.<String, Object>emptyMap());
}
public ExecutionResult execute(String requestString, Object context, Map<String, Object> arguments) {
return execute(requestString, null, context, arguments);
}
public ExecutionResult execute(String requestString, String operationName, Object context, Map<String, Object> arguments) {
assertNotNull(arguments, "arguments can't be null");
log.debug("Executing request. operation name: {}. Request: {} ", operationName, requestString);
Parser parser = new Parser();
Document document;
try {
document = parser.parseDocument(requestString);
} catch (ParseCancellationException e) {
RecognitionException recognitionException = (RecognitionException) e.getCause();
SourceLocation sourceLocation = new SourceLocation(recognitionException.getOffendingToken().getLine(), recognitionException.getOffendingToken().getCharPositionInLine());
InvalidSyntaxError invalidSyntaxError = new InvalidSyntaxError(sourceLocation);
return new ExecutionResultImpl(Collections.singletonList(invalidSyntaxError));
}
Validator validator = new Validator();
List<ValidationError> validationErrors = validator.validateDocument(graphQLSchema, document);
if (validationErrors.size() > 0) {
return new ExecutionResultImpl(validationErrors);
}
ExecutionId executionId = idProvider.provide(requestString, operationName, context);
Execution execution = new Execution(queryStrategy, mutationStrategy);
return execution.execute(executionId, graphQLSchema, context, document, operationName, arguments);
}
}