org.apache.tiles.servlet.context.ServletInitParamMap Maven / Gradle / Ivy

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Tiles servlet support, to enable use of Tiles inside a Servlet environment.
There is a newer version: 3.0.8
/*
 * $Id: ServletInitParamMap.java 581985 2007-10-04 18:57:15Z apetrelli $
 *
 * 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.tiles.servlet.context;

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;

import javax.servlet.ServletContext;

import org.apache.tiles.context.MapEntry;

/**
 * Private implementation of Map for servlet context
 * init parameters.
 *
 * @version $Rev: 581985 $ $Date: 2007-10-04 20:57:15 +0200 (gio, 04 ott 2007) $
 */

final class ServletInitParamMap implements Map {


    /**
     * Constructor.
     *
     * @param context The servlet context to use.
     */
    public ServletInitParamMap(ServletContext context) {
        this.context = context;
    }


    /**
     * The servlet context to use.
     */
    private ServletContext context = null;


    /** {@inheritDoc} */
    public void clear() {
        throw new UnsupportedOperationException();
    }


    /** {@inheritDoc} */
    public boolean containsKey(Object key) {
        return (context.getInitParameter(key(key)) != null);
    }


    /** {@inheritDoc} */
    public boolean containsValue(Object value) {
        Iterator values = values().iterator();
        while (values.hasNext()) {
            if (value.equals(values.next())) {
                return (true);
            }
        }
        return (false);
    }


    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public Set> entrySet() {
        Set> set = new HashSet>();
        Enumeration keys = context.getInitParameterNames();
        String key;
        while (keys.hasMoreElements()) {
            key = keys.nextElement();
            set.add(new MapEntry(key, context
                    .getInitParameter(key), false));
        }
        return (set);
    }


    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public boolean equals(Object o) {
        ServletContext otherContext = ((ServletInitParamMap) o).context;
        boolean retValue = true;
        synchronized (context) {
            for (Enumeration attribs = context.getInitParameterNames(); attribs
                    .hasMoreElements()
                    && retValue;) {
                String parameterName = attribs.nextElement();
                retValue = context.getInitParameter(parameterName).equals(
                        otherContext.getInitParameter(parameterName));
            }
        }

        return retValue;
    }


    /** {@inheritDoc} */
    public String get(Object key) {
        return (context.getInitParameter(key(key)));
    }


    /** {@inheritDoc} */
    public int hashCode() {
        return (context.hashCode());
    }


    /** {@inheritDoc} */
    public boolean isEmpty() {
        return (size() < 1);
    }


    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public Set keySet() {
        Set set = new HashSet();
        Enumeration keys = context.getInitParameterNames();
        while (keys.hasMoreElements()) {
            set.add(keys.nextElement());
        }
        return (set);
    }


    /** {@inheritDoc} */
    public String put(String key, String value) {
        throw new UnsupportedOperationException();
    }


    /** {@inheritDoc} */
    public void putAll(Map map) {
        throw new UnsupportedOperationException();
    }


    /** {@inheritDoc} */
    public String remove(Object key) {
        throw new UnsupportedOperationException();
    }


    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public int size() {
        int n = 0;
        Enumeration keys = context.getInitParameterNames();
        while (keys.hasMoreElements()) {
            keys.nextElement();
            n++;
        }
        return (n);
    }


    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public Collection values() {
        List list = new ArrayList();
        Enumeration keys = context.getInitParameterNames();
        while (keys.hasMoreElements()) {
            list.add(context.getInitParameter(keys.nextElement()));
        }
        return (list);
    }


    /**
     * Returns the string representation of the key.
     *
     * @param key The key.
     * @return The string representation of the key.
     * @throws IllegalArgumentException If the key is null.
     */
    private String key(Object key) {
        if (key == null) {
            throw new IllegalArgumentException();
        } else if (key instanceof String) {
            return ((String) key);
        } else {
            return (key.toString());
        }
    }


}