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/*
 * $Id$
 *
 * 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.struts.mock;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import javax.servlet.RequestDispatcher;
import javax.servlet.Servlet;
import javax.servlet.ServletContext;

import java.io.InputStream;

import java.net.URL;

import java.util.Enumeration;
import java.util.HashMap;
import java.util.Set;

/**
 * Mock ServletContext object for low-level unit tests of
 * Struts controller components.  Coarser grained tests should be implemented
 * in terms of the Cactus framework, instead of the mock object classes.
 *
 * WARNING - Only the minimal set of methods needed to
 * create unit tests is provided, plus additional methods to configure this
 * object as necessary.  Methods for unsupported operations will throw
 * UnsupportedOperationException.
 *
 * WARNING - Because unit tests operate in a single
 * threaded environment, no synchronization is performed.
 *
 * @version $Rev$ $Date: 2005-05-07 12:11:38 -0400 (Sat, 07 May 2005)
 *          $
 */
public class MockServletContext implements ServletContext {
    // ----------------------------------------------------- Instance Variables

    /**
     *  The set of servlet context attributes. 
     */
    protected HashMap attributes = new HashMap();

    /**
     *  Default destination for LOG() output. 
     */
    protected Log log = LogFactory.getLog(MockServletContext.class);

    /**
     *  The set of context initialization parameters. 
     */
    protected HashMap parameters = new HashMap();

    // --------------------------------------------------------- Public Methods
    public void addInitParameter(String name, String value) {
        parameters.put(name, value);
    }

    public void setLog(Log log) {
        this.log = log;
    }

    // ------------------------------------------------- ServletContext Methods
    public Object getAttribute(String name) {
        return (attributes.get(name));
    }

    public Enumeration getAttributeNames() {
        return (new MockEnumeration(attributes.keySet().iterator()));
    }

    public ServletContext getContext(String uripath) {
        throw new UnsupportedOperationException();
    }

    public String getInitParameter(String name) {
        return ((String) parameters.get(name));
    }

    public Enumeration getInitParameterNames() {
        return (new MockEnumeration(parameters.keySet().iterator()));
    }

    public int getMajorVersion() {
        return (2);
    }

    public String getMimeType(String file) {
        throw new UnsupportedOperationException();
    }

    public int getMinorVersion() {
        return (3);
    }

    public RequestDispatcher getNamedDispatcher(String name) {
        throw new UnsupportedOperationException();
    }

    public String getRealPath(String path) {
        throw new UnsupportedOperationException();
    }

    public RequestDispatcher getRequestDispatcher(String path) {
        throw new UnsupportedOperationException();
    }

    public URL getResource(String path) {
        return this.getClass().getResource(path);

        //throw new UnsupportedOperationException();
    }

    public InputStream getResourceAsStream(String path) {
        return this.getClass().getResourceAsStream(path);

        //throw new UnsupportedOperationException();
    }

    public Set getResourcePaths(String path) {
        throw new UnsupportedOperationException();
    }

    public String getServerInfo() {
        return ("MockServletContext/$Version$");
    }

    public Servlet getServlet(String name) {
        throw new UnsupportedOperationException();
    }

    public String getServletContextName() {
        return (getServerInfo());
    }

    public Enumeration getServletNames() {
        throw new UnsupportedOperationException();
    }

    public Enumeration getServlets() {
        throw new UnsupportedOperationException();
    }

    public void log(Exception exception, String message) {
        log(message, exception);
    }

    public void log(String message) {
        log.info(message);
    }

    public void log(String message, Throwable throwable) {
        log.error(message, throwable);
    }

    public void removeAttribute(String name) {
        attributes.remove(name);
    }

    public void setAttribute(String name, Object value) {
        if (value == null) {
            attributes.remove(name);
        } else {
            attributes.put(name, value);
        }
    }
}