graphql.validation.constraints.standard.PatternConstraint Maven / Gradle / Ivy

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package graphql.validation.constraints.standard;

import graphql.GraphQLError;
import graphql.Scalars;
import graphql.schema.GraphQLDirective;
import graphql.schema.GraphQLInputType;
import graphql.validation.constraints.AbstractDirectiveConstraint;
import graphql.validation.constraints.Documentation;
import graphql.validation.rules.ValidationEnvironment;

import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import static graphql.schema.GraphQLTypeUtil.isList;
import static java.util.Collections.emptyList;

public class PatternConstraint extends AbstractDirectiveConstraint {

    private final static Map SEEN_PATTERNS = new HashMap<>();

    public PatternConstraint() {
        super("Pattern");
    }

    @Override
    public Documentation getDocumentation() {
        return Documentation.newDocumentation()
                .messageTemplate(getMessageTemplate())

                .description("The String must match the specified regular expression, which follows the Java regular expression conventions.")

                .example("updateDriver( licencePlate : String @Pattern(regexp : \"[A-Z][A-Z][A-Z]-[0-9][0-9][0-9]\") : DriverDetails")

                .applicableTypeNames(Scalars.GraphQLString.getName(), "Lists")

                .directiveSDL("directive @Pattern(regexp : String! =\".*\", message : String = \"%s\") " +
                                "on ARGUMENT_DEFINITION | INPUT_FIELD_DEFINITION",
                        getMessageTemplate())
                .build();
    }

    @Override
    public boolean appliesToType(GraphQLInputType inputType) {
        return isOneOfTheseTypes(inputType,
            Scalars.GraphQLString) || isList(inputType);
    }

    @Override
    protected List runConstraint(ValidationEnvironment validationEnvironment) {
        Object validatedValue = validationEnvironment.getValidatedValue();
        GraphQLInputType argumentType = validationEnvironment.getValidatedType();

        if (validatedValue == null) {
            return emptyList();
        }

        List