web/src/main/java/org/apache/commons/chain2/web/AbstractSetLocaleCommand.java

/*
 * 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.commons.chain2.web;

import org.apache.commons.chain2.Command;
import org.apache.commons.chain2.Context;
import org.apache.commons.chain2.Processing;

import java.util.Locale;

/**
 * <p>Abstract base {@link Command} implementation for setting the
 * response locale for this response to the <code>Locale</code> stored
 * under the context attribute key returned by the <code>localeKey</code>
 * property.</p>
 *
 * @param <C> Type of the context associated with this command
 *
 * @version $Id$
 */
public abstract class AbstractSetLocaleCommand<C extends WebContext<String, Object>>
        implements Command<String, Object, C> {

    // -------------------------------------------------------------- Properties

    /**
     * <p>The context attribute key used to retrieve the <code>Locale</code>.</p>
     */
    private String localeKey = "locale";

    /**
     * <p>Return the context attribute key under which we will retrieve
     * the response <code>Locale</code>.</p>
     *
     * @return The context attribute key of the request <code>Locale</code>.
     */
    public String getLocaleKey() {
        return (this.localeKey);
    }

    /**
     * <p>Set the context attribute key under which we will retrieve
     * the response <code>Locale</code>.</p>
     *
     * @param localeKey The new context attribute key
     */
    public void setLocaleKey(String localeKey) {
        this.localeKey = localeKey;
    }

    // --------------------------------------------------------- Command Methods

    /**
     * <p>Retrieve the <code>Locale</code> stored under the specified
     * context attribute key, and establish it on this response.</p>
     *
     * @param context The {@link Context} we are operating on
     *
     * @return {@link Processing#CONTINUE} so that the processing will continue.
     * @throws org.apache.commons.chain2.ChainException If an error occurs during execution.
     */
    public Processing execute(C context) {
        setLocale(context, (Locale) context.get(getLocaleKey()));
        return Processing.CONTINUE;
    }

    // ------------------------------------------------------- Protected Methods

    /**
     * <p>Establish the specified <code>Locale</code> for this response.</p>
     *
     * @param context The {@link Context} we are operating on.
     * @param locale The Locale for the request.
     */
    protected abstract void setLocale(C context, Locale locale);

}