// $Id: ConfigurationState.java 17620 2009-10-04 19:19:28Z hardy.ferentschik $
/*
* JBoss, Home of Professional Open Source
* Copyright 2009, Red Hat, Inc. and/or its affiliates, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package javax.validation.spi;

import java.util.Map;
import java.util.Set;
import javax.validation.ConstraintValidatorFactory;
import javax.validation.MessageInterpolator;
import javax.validation.TraversableResolver;

/**
 * Contract between a <code>Configuration</code> and a
 * </code>ValidatorProvider</code> to create a <code>ValidatorFactory</code>.
 * The configuration artifacts defined in the XML configuration and provided to the
 * <code>Configuration</code> are merged and passed along via
 * <code>ConfigurationState</code>.
 *
 * @author Emmanuel Bernard
 * @author Hardy Ferentschik
 */
public interface ConfigurationState {

  /**
   * Returns true if Configuration.ignoreXMLConfiguration() has been called
   * In this case, the ValidatorFactory must ignore META-INF/validation.xml
   *
   * @return {@code true} if META-INF/validation.xml should be ignored
   */
  boolean isIgnoreXmlConfiguration();

  /**
   * Returns the message interpolator of this configuration.
   * Message interpolator is defined in the following decreasing priority:
   * <ul>
   * <li>set via the <code>Configuration</code> programmatic API</li>
   * <li>defined in META-INF/validation.xml provided that ignoreXmlConfiguration
   * is false. In this case the instance is created via its no-arg constructor.</li>
   * <li>{@code null} if undefined.</li>
   * </ul>
   *
   * @return message provider instance or null if not defined
   */
  MessageInterpolator getMessageInterpolator();

  /**
   * Returns a set of configuration streams.
   * The streams are defined by:
   * <ul>
   * <li>mapping XML streams passed programmatically in <code>Configuration</code></li>
   * <li>mapping XML stream located in the resources defined in</li>
   * META-INF/validation.xml (constraint-mapping element)
   * </ul>
   * Streams represented in the XML configuration and opened by the
   * <code>Configuration</code> implementation must be closed by the
   * <code>Configuration</code> implementation after the <code>ValidatorFactory</code>
   * creation (or if an exception occurs).
   * 
   * <p/>
   * GWT change:  Rerturn a set of Strings intest of a InputStream.
   *
   * @return set of Strings (was input stream)
   */
  Set<String> getMappingStreams();

  /**
   * Returns the constraint validator factory of this configuration.
   * The {@code ConstraintValidatorFactory} implementation is defined in the following
   * decreasing priority:
   * <ul>
   * <li>set via the <code>Configuration</code> programmatic API</li>
   * <li>defined in META-INF/validation.xml provided that ignoredXmlConfiguration
   * is false. In this case the instance is created via its no-arg constructor.</li>
   * <li>{@code null} if undefined.</li>
   * </ul>
   *
   * @return factory instance or {@code null} if not defined
   */
  ConstraintValidatorFactory getConstraintValidatorFactory();

  /**
   * Returns the traversable resolver for this configuration.
   * <code>TraversableResolver</code> is defined in the following decreasing priority:
   * <ul>
   * <li>set via the <code>Configuration</code> programmatic API</li>
   * <li>defined in META-INF/validation.xml provided that ignoredXmlConfiguration
   * is false. In this case the instance is created via its no-arg constructor.</li>
   * <li>{@code null} if undefined.</li>
   * </ul>
   *
   * @return traversable provider instance or {@code null} if not defined
   */
  TraversableResolver getTraversableResolver();

  /**
   * Returns a map of non type-safe custom properties.
   * Properties defined via:
   * <ul>
   * <li>Configuration.addProperty(String, String)</li>
   * <li>META-INF/validation.xml provided that ignoredXmlConfiguration</li>
   * is false.
   * </ul>
   * If a property is defined both programmatically and in XML,
   * the value defined programmatically has priority
   *
   * @return Map whose key is the property key and the value the property value
   */
  Map<String, String> getProperties();
}