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Valter was created to test beans using JSR303 validation.

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package pl.oakfusion.valter;

import com.rits.cloning.Cloner;

import java.lang.reflect.Field;

import static java.lang.String.format;
import static org.junit.Assert.fail;

public class FieldModifier {
	private static final Cloner CLONER = new Cloner();
	private static final String NO_SUCH_FIELD_FAIL_MESSAGE_FORMAT = "Maybe, probably field: '%s' was not found.";
	private static final String CAN_NOT_ACCESS_FIELD_MESSAGE_FORMAT = "Can not access field: '%s'";
	private static final String CAN_NOT_SET_FIELD_MESSAGE_FORMAT = "Can not set field '%s', type mismatch.";
	private final CaseBuilder caseBuilder;
	private final ViolationCase violationsCase;

	public FieldModifier(ViolationCase violationsCase, CaseBuilder caseBuilder) {
		this.violationsCase = violationsCase;
		this.caseBuilder = caseBuilder;
	}

	public CaseAppender when(Object value) {

		T bean = CLONER.deepClone(caseBuilder.getBean());

		modifyFieldValue(value, bean, violationsCase.getFieldName());

		return new CaseAppender<>(violationsCase, caseBuilder, bean);
	}

	private void modifyFieldValue(Object value, T bean, String fieldName) {
		try {
			Class c = bean.getClass();
			Field field = c.getDeclaredField(fieldName);
			field.setAccessible(true);
			field.set(bean, value);
		} catch (NoSuchFieldException e) {
			fail(format(NO_SUCH_FIELD_FAIL_MESSAGE_FORMAT, fieldName));
		} catch (IllegalAccessException e) {
			fail(format(CAN_NOT_ACCESS_FIELD_MESSAGE_FORMAT, fieldName));
		} catch (IllegalArgumentException e) {
			fail(format(CAN_NOT_SET_FIELD_MESSAGE_FORMAT, fieldName));
		}
	}
}