ModelValidatingForm.java

package fr.openwide.core.wicket.more.markup.html.form;

import java.util.List;

import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.FormComponent;
import org.apache.wicket.model.IModel;
import org.apache.wicket.util.lang.Args;

import com.google.common.collect.Lists;

import fr.openwide.core.wicket.more.markup.html.form.validation.IFormModelValidator;
import fr.openwide.core.wicket.more.util.model.Detachables;

public class ModelValidatingForm<E> extends Form<E> {

	private static final long serialVersionUID = 214102105248521648L;

	private final List<IFormModelValidator> formModelValidators = Lists.newArrayList();

	public ModelValidatingForm(String id) {
		super(id);
	}

	public ModelValidatingForm(String id, IModel<E> model) {
		super(id, model);
	}

	@Override
	protected void onValidateModelObjects() {
		super.onValidateModelObjects();

		for (IFormModelValidator formModelValidator : formModelValidators) {
			validateFormModelValidator(formModelValidator);
		}
	}

	private void validateFormModelValidator(IFormModelValidator validator) {
		Args.notNull(validator, "validator");

		final FormComponent<?>[] dependents = validator.getDependentFormComponents();

		boolean validate = true;

		if (dependents != null) {
			for (final FormComponent<?> dependent : dependents) {
				if (!dependent.isValid() || !dependent.isVisibleInHierarchy()) {
					validate = false;
					break;
				}
			}
		}

		if (validate) {
			validator.validate(this);
		}
	}

	public ModelValidatingForm<E> add(IFormModelValidator firstFormModelValidator, IFormModelValidator... otherFormModelValidators) {
		formModelValidators.addAll(Lists.asList(firstFormModelValidator, otherFormModelValidators));
		return this;
	}
	
	@Override
	protected void onDetach() {
		super.onDetach();
		Detachables.detach(formModelValidators);
	}

}