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This library offers components that facilitate validation of arbitrary objects and how they are serialized towards a client. It focuses on the wiring of the proposed patterns and does not contain any concrete validator implementations.

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package com.lotaris.jee.validation.preprocessing;

import com.lotaris.jee.validation.IValidationContext;
import com.lotaris.jee.validation.IValidator;

/**
 * Applies all validators returned by {@link IPreprocessingConfig#getValidators()} to the processed
 * object. If the object is invalid, errors are collected into the {@link ApiErrorResponse}
 * returned by {@link IPreprocessingConfig#getErrors()}.
 *
 * Note that the validators are guaranteed to be executed in order.
 *
 * @author Simon Oulevay ([email protected])
 */
public class ValidationPreprocessor implements IPreprocessor {

	@Override
	@SuppressWarnings("unchecked")
	public boolean process(Object object, IPreprocessingConfig config) {

		// build an initial validation context (its current location is the root of the JSON document)
		final IValidationContext context = config.getValidationContext();

		// collect errors for each validator
		for (IValidator validator : config.getValidators()) {
			validator.collectErrors(object, context);
		}

		return true;
	}
}