org.hibernate.validator.internal.constraintvalidators.ScriptAssertValidator Maven / Gradle / Ivy

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package org.hibernate.validator.internal.constraintvalidators;

import javax.script.ScriptException;
import javax.validation.ConstraintDeclarationException;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

import org.hibernate.validator.constraints.ScriptAssert;
import org.hibernate.validator.internal.util.Contracts;
import org.hibernate.validator.internal.util.logging.Log;
import org.hibernate.validator.internal.util.logging.LoggerFactory;
import org.hibernate.validator.internal.util.scriptengine.ScriptEvaluator;
import org.hibernate.validator.internal.util.scriptengine.ScriptEvaluatorFactory;

import static org.hibernate.validator.internal.util.logging.Messages.MESSAGES;

/**
 * Validator for the {@link ScriptAssert} constraint annotation.
 *
 * @author Gunnar Morling
 * @author Hardy Ferentschik
 * @author Kevin Pollet  (C) 2011 SERLI
 */
public class ScriptAssertValidator implements ConstraintValidator {

	private static final Log log = LoggerFactory.make();

	private String script;
	private String languageName;
	private String alias;

	public void initialize(ScriptAssert constraintAnnotation) {
		validateParameters( constraintAnnotation );

		this.script = constraintAnnotation.script();
		this.languageName = constraintAnnotation.lang();
		this.alias = constraintAnnotation.alias();
	}

	public boolean isValid(Object value, ConstraintValidatorContext constraintValidatorContext) {

		Object evaluationResult;
		ScriptEvaluator scriptEvaluator;

		try {
			ScriptEvaluatorFactory evaluatorFactory = ScriptEvaluatorFactory.getInstance();
			scriptEvaluator = evaluatorFactory.getScriptEvaluatorByLanguageName( languageName );
		}
		catch ( ScriptException e ) {
			throw new ConstraintDeclarationException( e );
		}

		try {
			evaluationResult = scriptEvaluator.evaluate( script, value, alias );
		}
		catch ( ScriptException e ) {
			throw log.getErrorDuringScriptExecutionException( script, e );
		}

		if ( evaluationResult == null ) {
			throw log.getScriptMustReturnTrueOrFalseException( script );
		}
		if ( !( evaluationResult instanceof Boolean ) ) {
			throw log.getScriptMustReturnTrueOrFalseException(
					script,
					evaluationResult,
					evaluationResult.getClass().getCanonicalName()
			);
		}

		return Boolean.TRUE.equals( evaluationResult );
	}

	private void validateParameters(ScriptAssert constraintAnnotation) {
		Contracts.assertNotEmpty( constraintAnnotation.script(), MESSAGES.parameterMustNotBeEmpty( "script" ) );
		Contracts.assertNotEmpty( constraintAnnotation.lang(), MESSAGES.parameterMustNotBeEmpty( "lang" ) );
		Contracts.assertNotEmpty( constraintAnnotation.alias(), MESSAGES.parameterMustNotBeEmpty( "alias" ) );
	}
}