patroncodevalidator.java

Enjoy Web Dev With Tapestry 一书的源代码

package com.ttdev.postage;

import org.apache.tapestry.*;
import org.apache.tapestry.form.*;
import org.apache.tapestry.form.validator.*;
import org.apache.tapestry.valid.*;

public class PatronCodeValidator implements Validator {

	private KnownPatrons knownPatrons;

	public void setKnownPatrons(KnownPatrons knownPatrons) {
		this.knownPatrons = knownPatrons;
	}
	public void validate(IFormComponent field, ValidationMessages messages, Object object) throws ValidatorException {
		String patronId = (String) object;
		if (!knownPatrons.isKnown(patronId)) {
			throw new ValidatorException("Patron not found", null);
		}
	}

	public boolean getAcceptsNull() {
		return false;
	}

	public void renderContribution(IMarkupWriter writer, IRequestCycle cycle, FormComponentContributorContext context, IFormComponent field) {
	}
	public boolean isRequired() {
		return false;
	}

}