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The Adobe Experience Manager SDK

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/*
 * 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.
 */
package org.apache.felix.webconsole;

import org.apache.felix.webconsole.servlet.RequestVariableResolver;
import org.osgi.annotation.versioning.ConsumerType;

/**
 * The VariableResolver interface defines the API for an object
 * which may be provided by plugins to provide replacement values for
 * variables in the generated content.
 * 
 * Plugins should call the
 * {@link WebConsoleUtil#setVariableResolver(javax.servlet.ServletRequest, VariableResolver)}
 * method to provide their implementation for variable resolution.
 * 

 * The main use of such a variable resolver is when a plugin is using a static
 * template which provides slots to place dynamically generated content
 * parts.
 * 
 * Note: The variable resolver must be set in the request before
 * the response writer is retrieved calling the
 * ServletRequest.getWriter() method. Otherwise the variable
 * resolver will not be used for resolving variables.
 *
 * @see WebConsoleUtil#getVariableResolver(javax.servlet.ServletRequest)
 * @see WebConsoleUtil#setVariableResolver(javax.servlet.ServletRequest, VariableResolver)
 * @deprecated Use {@link RequestVariableResolver} instead.
 */
@ConsumerType
@Deprecated
public interface VariableResolver {

    /**
     * Returns a replacement value for the named variable or null
     * if no replacement is available.
     *
     * @param variable The name of the variable for which to return a
     *      replacement.
     * @return The replacement value or null if no replacement is
     *      available.
     */
    String resolve( String variable );
}