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 * CruiseControl, a Continuous Integration Toolkit
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package net.sourceforge.cruisecontrol.dashboard.web.validator;

import java.io.ByteArrayInputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import net.sourceforge.cruisecontrol.dashboard.web.command.ConfigurationCommand;

import org.springframework.validation.Errors;
import org.springframework.validation.Validator;

public class ConfigXmlContentValidator implements Validator {

    private final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

    public boolean supports(Class aClass) {
        return ConfigurationCommand.class.isAssignableFrom(aClass);
    }

    public void validate(Object object, Errors errors) {
        ConfigurationCommand cmd = (ConfigurationCommand) object;
        String configFileContent = cmd.getConfigFileContent();
        factory.setNamespaceAware(true);

        try {
            DocumentBuilder builder = factory.newDocumentBuilder();
            builder.parse(new ByteArrayInputStream(configFileContent.getBytes()));
        } catch (Exception spe) {
            errors.rejectValue("configFileContent", "configFileContents.format.error",
                    "The configuration file is not valid XML: " + spe.getMessage());
        }
    }
}