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The Apache Sling API defines an extension to the Servlet API 2.4 to provide access to content and unified access to request parameters hiding the differences between the different methods of transferring parameters from client to server. Note that the Apache Sling API bundle does not include the Servlet API but instead requires the API to be provided by the Servlet container in which the Apache Sling framework is running or by another bundle.

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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.sling.api.resource;

import org.apache.sling.api.SlingException;

/**
 * An Exception that causes Sling to return a 404 (NOT FOUND) status code. This
 * exception should not be caught but rather let be handed up the call stack up
 * to the Sling error and exception handling.
 * 
 * The advantage of using this exception over the
 * HttpServletResponse.sendError methods is that the request can
 * be aborted immediately all the way up in the call stack and that in addition
 * to the status code and an optional message a Throwable may be
 * supplied providing more information.
 */
public class ResourceNotFoundException extends SlingException {

    private static final long serialVersionUID = -6684709279554347984L;

    private final String resource;

    public ResourceNotFoundException(String message) {
        this(null, message);
    }

    public ResourceNotFoundException(String resource, String message) {
        super("Resource at '"+ resource + "' not found: " + message);
        this.resource = resource;
    }

    public ResourceNotFoundException(String message, Throwable cause) {
        this(null, message, cause);
    }

    public ResourceNotFoundException(String resource, String message,
            Throwable cause) {
        super(message, cause);
        this.resource = resource;
    }

    public String getResource() {
        return resource;
    }
}