/*
 * 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.myfaces.tobago.mock.faces;

import javax.servlet.ServletContext;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

final class MockApplicationMap implements Map {


    public MockApplicationMap(ServletContext context) {
        this.context = context;
    }


    private ServletContext context = null;


    public void clear() {
        Iterator keys = keySet().iterator();
        while (keys.hasNext()) {
            context.removeAttribute((String) keys.next());
        }
    }


    public boolean containsKey(Object key) {
        return (context.getAttribute(key(key)) != null);
    }


    public boolean containsValue(Object value) {
        if (value == null) {
            return (false);
        }
        Enumeration keys = context.getAttributeNames();
        while (keys.hasMoreElements()) {
            Object next = context.getAttribute((String) keys.nextElement());
            if (next == value) {
                return (true);
            }
        }
        return (false);
    }


    public Set entrySet() {
        Set set = new HashSet();
        Enumeration keys = context.getAttributeNames();
        while (keys.hasMoreElements()) {
            set.add(context.getAttribute((String) keys.nextElement()));
        }
        return (set);
    }


    public boolean equals(Object o) {
        return (context.equals(o));
    }


    public Object get(Object key) {
        return (context.getAttribute(key(key)));
    }


    public int hashCode() {
        return (context.hashCode());
    }


    public boolean isEmpty() {
        return (size() < 1);
    }


    public Set keySet() {
        Set set = new HashSet();
        Enumeration keys = context.getAttributeNames();
        while (keys.hasMoreElements()) {
            set.add(keys.nextElement());
        }
        return (set);
    }


    public Object put(Object key, Object value) {
        if (value == null) {
            return (remove(key));
        }
        String skey = key(key);
        Object previous = context.getAttribute(skey);
        context.setAttribute(skey, value);
        return (previous);
    }


    public void putAll(Map map) {
        Iterator keys = map.keySet().iterator();
        while (keys.hasNext()) {
            String key = (String) keys.next();
            context.setAttribute(key, map.get(key));
        }
    }


    public Object remove(Object key) {
        String skey = key(key);
        Object previous = context.getAttribute(skey);
        context.removeAttribute(skey);
        return (previous);
    }


    public int size() {
        int n = 0;
        Enumeration keys = context.getAttributeNames();
        while (keys.hasMoreElements()) {
            keys.nextElement();
            n++;
        }
        return (n);
    }


    public Collection values() {
        List list = new ArrayList();
        Enumeration keys = context.getAttributeNames();
        while (keys.hasMoreElements()) {
            list.add(context.getAttribute((String) keys.nextElement()));
        }
        return (list);
    }


    private String key(Object key) {
        if (key == null) {
            throw new IllegalArgumentException();
        } else if (key instanceof String) {
            return ((String) key);
        } else {
            return (key.toString());
        }
    }


}
