org.jasig.portlet.announcements.controller.UserAgentViewNameSelector.java Source code

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Here is the source code for org.jasig.portlet.announcements.controller.UserAgentViewNameSelector.java

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/**
 * Licensed to Apereo under one or more contributor license
 * agreements. See the NOTICE file distributed with this work
 * for additional information regarding copyright ownership.
 * Apereo 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 the following location:
 *
 *   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.jasig.portlet.announcements.controller;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;

import javax.portlet.PortletRequest;

import org.springframework.beans.factory.InitializingBean;

public class UserAgentViewNameSelector implements IViewNameSelector, InitializingBean {

    private Map<String, String> userAgentMappings;
    private final Map<Pattern, String> patterns = new HashMap<Pattern, String>();

    public void afterPropertiesSet() {
        // Compile our patterns
        for (Map.Entry<String, String> y : userAgentMappings.entrySet()) {
            patterns.put(Pattern.compile(y.getKey()), y.getValue());
        }
    }

    public String select(PortletRequest req, String baseViewName) {

        // Assertions.
        if (req == null) {
            String msg = "Argument 'req' cannot be null";
            throw new IllegalArgumentException(msg);
        }

        StringBuilder rslt = new StringBuilder(baseViewName);

        String userAgent = req.getProperty("user-agent");
        if (userAgent != null && patterns.size() != 0) {
            for (Map.Entry<Pattern, String> y : patterns.entrySet()) {
                if (y.getKey().matcher(userAgent).matches()) {
                    rslt.append(y.getValue());
                    break;
                }
            }
        }

        return rslt.toString();

    }

    public void setUserAgentMappings(Map<String, String> userAgentMappings) {
        this.userAgentMappings = Collections.unmodifiableMap(userAgentMappings);
    }

}