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A web service test double for all occasions - standalone edition

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/*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * 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 com.github.tomakehurst.wiremock.jetty9;

import org.eclipse.jetty.server.Dispatcher;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.server.handler.ErrorHandler;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

import static com.github.tomakehurst.wiremock.common.Exceptions.throwUnchecked;

public class NotFoundHandler extends ErrorHandler {

    private final ErrorHandler DEFAULT_HANDLER = new ErrorHandler();

    private final ContextHandler mockServiceHandler;

    public NotFoundHandler(ContextHandler mockServiceHandler) {
        this.mockServiceHandler = mockServiceHandler;
    }

    @Override
    public boolean errorPageForMethod(String method) {
        return true;
    }

    @Override
    public void handle(String target, final Request baseRequest, final HttpServletRequest request, HttpServletResponse response) throws IOException {
        if (response.getStatus() == 404) {

            ServletContext adminContext = mockServiceHandler.getServletContext().getContext("/__admin");
            Dispatcher requestDispatcher = (Dispatcher) adminContext.getRequestDispatcher("/not-matched");

            try {
                requestDispatcher.error(request, response);
            } catch (ServletException e) {
                throwUnchecked(e);
            }
        } else {
            try {
                DEFAULT_HANDLER.handle(target, baseRequest, request, response);
            } catch (Exception e) {
                if (e instanceof IOException) {
                    throw (IOException) e;
                }

                throwUnchecked(e);
            }
        }
    }
}