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package org.apache.maven.configuration;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

/**
 * A request to configure a bean from some configuration in the POM or similar.
 * 
 * @author Benjamin Bentmann
 */
public interface BeanConfigurationRequest
{

    /**
     * Gets the bean to configure. Eventually, a valid request must have a bean set.
     * 
     * @return The bean to configure, or {@code null} if none.
     */
    Object getBean();

    /**
     * Sets the bean to configure. Eventually, a valid request must have a bean set.
     * 
     * @param bean The bean to configure, may be {@code null}.
     * @return This request for chaining, never {@code null}.
     */
    BeanConfigurationRequest setBean( Object bean );

    /**
     * Gets the configuration to unmarshal into the bean.
     * 
     * @return The configuration to unmarshal into the bean or {@code null} if none.
     */
    Object getConfiguration();

    /**
     * Sets the configuration to unmarshal into the bean. The configuration should be taken from
     * {@link org.apache.maven.model.ConfigurationContainer#getConfiguration()} or a similar source.
     * Fully equivalent to {@code setConfiguration(configuration, null)}.
     * 
     * @param configuration The configuration to unmarshal, may be {@code null}.
     * @return This request for chaining, never {@code null}.
     */
    BeanConfigurationRequest setConfiguration( Object configuration );

    /**
     * Sets the configuration to unmarshal into the bean. The configuration should be taken from
     * {@link org.apache.maven.model.ConfigurationContainer#getConfiguration()} or a similar source.
     * If {@code element} is not {@code null}, child configuration element with the specified name will 
     * be unmarshaled.
     * 
     * @param configuration The configuration to unmarshal, may be {@code null}.
     * @param element Configuration element name to unmarshal or {@code null} to unmarshal entire configuration.
     * @return This request for chaining, never {@code null}.
     */
    BeanConfigurationRequest setConfiguration( Object configuration, String element );

    /**
     * Returns configuration element name or {@code null}. 
     * 
     * @see {@link #setConfiguration(Object, String)}
     * 
     * @return Configuration element name or {@code null}
     */
    String getConfigurationElement();

    /**
     * Gets the class loader from which to load any types referenced by the configuration. If unset, the class loader of
     * the bean class will be used.
     * 
     * @return The class loader to load referenced types from or {@code null} if unset.
     */
    ClassLoader getClassLoader();

    /**
     * Sets the class loader from which to load any types referenced by the configuration. If unset, the class loader of
     * the bean class will be used.
     * 
     * @param classLoader The class loader to load referenced types from, may be {@code null}.
     * @return This request for chaining, never {@code null}.
     */
    BeanConfigurationRequest setClassLoader( ClassLoader classLoader );

    /**
     * Gets the optional preprocessor for configuration values.
     * 
     * @return The preprocessor for configuration values or {@code null} if none.
     */
    BeanConfigurationValuePreprocessor getValuePreprocessor();

    /**
     * Sets the optional preprocessor for configuration values.
     * 
     * @param valuePreprocessor The preprocessor for configuration values, may be {@code null} if unneeded.
     * @return This request for chaining, never {@code null}.
     */
    BeanConfigurationRequest setValuePreprocessor( BeanConfigurationValuePreprocessor valuePreprocessor );

    /**
     * Gets the optional path translator for configuration values unmarshalled to files.
     * 
     * @return The path translator for files or {@code null} if none.
     */
    BeanConfigurationPathTranslator getPathTranslator();

    /**
     * Sets the optional path translator for configuration values unmarshalled to files.
     * 
     * @param pathTranslator The path translator for files, may be {@code null} if unneeded.
     * @return This request for chaining, never {@code null}.
     */
    BeanConfigurationRequest setPathTranslator( BeanConfigurationPathTranslator pathTranslator );

}