AbstractHttpProtocol.java

/**
 * Licensed to DigitalPebble Ltd under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * DigitalPebble 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 com.digitalpebble.storm.crawler.protocol;

import org.apache.commons.lang.StringUtils;

public abstract class AbstractHttpProtocol implements Protocol {

    protected static String getAgentString(String agentName,
            String agentVersion, String agentDesc, String agentURL,
            String agentEmail) {

        StringBuffer buf = new StringBuffer();

        buf.append(agentName);

        if (StringUtils.isNotBlank(agentVersion)) {
            buf.append("/");
            buf.append(agentVersion);
        }

        boolean hasAgentDesc = StringUtils.isNotBlank(agentDesc);
        boolean hasAgentURL = StringUtils.isNotBlank(agentURL);
        boolean hasAgentEmail = StringUtils.isNotBlank(agentEmail);

        if (hasAgentDesc || hasAgentEmail || hasAgentURL) {
            buf.append(" (");

            if (hasAgentDesc) {
                buf.append(agentDesc);
                if (hasAgentURL || hasAgentEmail)
                    buf.append("; ");
            }

            if (hasAgentURL) {
                buf.append(agentURL);
                if (hasAgentEmail)
                    buf.append("; ");
            }

            if (hasAgentEmail) {
                buf.append(agentEmail);
            }

            buf.append(")");
        }

        return buf.toString();
    }

}