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/*
	Milyn - Copyright (C) 2006 - 2010

	This library is free software; you can redistribute it and/or
	modify it under the terms of the GNU Lesser General Public
	License (version 2.1) as published by the Free Software
	Foundation.

	This library 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 Lesser General Public License for more details:
	http://www.gnu.org/licenses/lgpl.txt
*/
package org.milyn.validation;

import org.milyn.rules.RuleEvalResult;
import org.milyn.rules.regex.RegexRuleEvalResult;
import org.milyn.rules.regex.RegexProvider;

import java.util.Locale;
import java.util.ResourceBundle;

/**
 * {@link OnFail} result.
 * 
 * Contains details of a validation rule failure.
 *
 * 
Localized Messages
 * Every rule source file (no mater what the provider type) can have associated
 * Validation message files ({@link ResourceBundle ResourceBundles}).
 * 
 * The base bundle name is derived from the rules src.  The Validation message base bundle name for
 * a rules source "/a/b/c/rulesX.xml" would be "a/b/c/i18n/rulesX", which means that localized
 * {@link ResourceBundle} files would need to be supplied on the classpath/filesystem as "/a/b/c/i18n/rulesX.properties",
 * "/a/b/c/i18n/rulesX_en.properties", "/a/b/c/i18n/rulesX_de.properties" etc.  The message property
 * names are based on the rule property names e.g. the message bundle property name for rule "orderId"
 * would also need to be "orderId".
 * 

 * The validation cartridge supports application of FreeMarker templates on the localized messages,
 * allowing the messages to contain contextual data from the bean context, as well as data about the actual
 * rule failure.  FreeMarker based messages must be prefixed with "ftl:" and the contextual data is references
 * using the normal FreeMarker notation.  The beans from the bean context can be referenced directly, while the
 * {@link RuleEvalResult} and rule failure path can be referenced through the "ruleResult" and "path"
 * beans.
 * 

 * Example message using {@link RegexProvider} rules:

 * 
 * customerId=ftl:Invalid customer number '${{@link RegexRuleEvalResult#getText() ruleResult.text}}' at '${path}'.  Customer number must match pattern '${{@link RegexRuleEvalResult#getPattern() ruleResult.pattern}}'.
 * 
 * 
 *
 * @author [email protected]
 */
public interface OnFailResult {

    /**
     * Maximum failures global param key.
     */
    public static final String MAX_FAILS = "validation.maxFails";

    /**
     * Get the path to the fragment on which the validation rule failure
     * occured.
     * @return The path to the fragment on which the validation rule failure
     * occured.
     */
    String getFailFragmentPath();

    /**
     * Get the validation failure {@link RuleEvalResult}.
     * @return The validation failure {@link RuleEvalResult}.
     */
    RuleEvalResult getFailRuleResult();

    /**
     * Get a localized message for the validation failure.
     * 
     * Uses the default {@link Locale}.
     * 

     * See Localized Messages.
     *
     * @return A localized message for the validation failure.
     */
    String getMessage();

    /**
     * Get a localized message for the validation failure.
     * 
     * See Localized Messages.
     *
     * @return A localized message for the validation failure.
     */
    String getMessage(Locale locale);
}