PropertySimpleValueConverter.java

/*
* RHQ Management Platform
* Copyright (C) 2005-2008 Red Hat, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation, and/or the GNU Lesser
* General Public License, version 2.1, also as published by the Free
* Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License and the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* and the GNU Lesser General Public License along with this program;
* if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.rhq.core.gui.converter;

import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;

import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.component.UIInput;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.validator.Validator;
import javax.faces.validator.ValidatorException;

import org.rhq.core.gui.configuration.AbstractConfigurationComponent;
import org.rhq.core.template.TemplateEngine;

/**
 * @author Ian Springer
 */

public class PropertySimpleValueConverter implements Converter , Serializable{

    TemplateEngine engine = null;

    
    public void setEngine(TemplateEngine engine) {
        this.engine = engine;
    }

    public PropertySimpleValueConverter(TemplateEngine engine ) {
        this.engine = engine;
    }

    /**
     * A special value for an input that tells the server-side that the corresponding value should be set to null.
     */
    public static final String NULL_INPUT_VALUE = " ";

    public Object getAsObject(FacesContext context, UIComponent component, String string) {

        if ((engine != null) && (string != null)) {
            string = engine.replaceTokens(string);
        }
        //noinspection UnnecessaryLocalVariable
        Object object = NULL_INPUT_VALUE.equals(string) ? null : string;

        validateEmptyString(context, component, string);
        return object;
    }

    public String getAsString(FacesContext facesContext, UIComponent component, Object object) {
        //noinspection UnnecessaryLocalVariable
        String string = (String) object;
        return string;
    }

    private static void validateEmptyString(FacesContext context, UIComponent component, String string) {
        UIInput input = (UIInput) component;
        if (input.isValid() && string != null && string.length() == 0) {
            if (input.getValidators() != null) {
                for (Validator validator : input.getValidators()) {
                    try {
                        validator.validate(context, input, string);
                    } catch (ValidatorException ve) {
                        // If the validator throws an exception, we're
                        // invalid, and we need to add a message
                        input.setValid(false);
                        FacesMessage message;
                        String validatorMessageString = input.getValidatorMessage();
                        if (null != validatorMessageString) {
                            message = new FacesMessage(FacesMessage.SEVERITY_ERROR, validatorMessageString,
                                validatorMessageString);
                            message.setSeverity(FacesMessage.SEVERITY_ERROR);
                        } else {
                            message = ve.getFacesMessage();
                        }
                        if (message != null) {
                            context.addMessage(input.getClientId(context), message);
                        }
                    }
                }
            }
        }
    }
}