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package graphql.validation.rules;

import graphql.Internal;
import graphql.language.OperationDefinition;
import graphql.language.VariableDefinition;
import graphql.validation.AbstractRule;
import graphql.validation.ValidationContext;
import graphql.validation.ValidationErrorCollector;

import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import static graphql.validation.ValidationErrorType.DuplicateVariableName;

/**
 * Unique variable names
 * 

* A GraphQL operation is only valid if all its variables are uniquely named. */ @Internal public class UniqueVariableNames extends AbstractRule { public UniqueVariableNames(ValidationContext validationContext, ValidationErrorCollector validationErrorCollector) { super(validationContext, validationErrorCollector); } @Override public void checkOperationDefinition(OperationDefinition operationDefinition) { List variableDefinitions = operationDefinition.getVariableDefinitions(); if (variableDefinitions == null || variableDefinitions.size() <= 1) { return; } Set variableNameList = new LinkedHashSet<>(variableDefinitions.size()); for (VariableDefinition variableDefinition : variableDefinitions) { if (variableNameList.contains(variableDefinition.getName())) { String message = i18n(DuplicateVariableName, "UniqueVariableNames.oneVariable", variableDefinition.getName()); addError(DuplicateVariableName, variableDefinition.getSourceLocation(), message); } else { variableNameList.add(variableDefinition.getName()); } } } }





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