/*
 * Copyright 2005 the original author or authors.
 * 
 * Licensed 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.wamblee.crawler;

import java.io.IOException;

import javax.xml.transform.TransformerException;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.w3c.dom.Document;

/**
 * Gets a page by issueing a get request.
 */
public class GetPageRequest extends AbstractPageRequest {

    /**
     * Constructs the request.
     * @param aMaxTries Maximum number of retries. 
     * @param aMaxDelay Maximum delay before executing the request.
     * @param aParams Request parameters to use. 
     * @param aXslt XSLT to use. 
     */
    public GetPageRequest(int aMaxTries, int aMaxDelay, NameValuePair[] aParams, String aXslt) {
        super(aMaxTries, aMaxDelay, aParams, aXslt);
    }
    
    /*
     * (non-Javadoc)
     * 
     * @see org.wamblee.crawler.PageRequest#getPage(org.apache.commons.httpclient.HttpClient)
     */
    public Document execute(String aUrl, HttpClient aClient)
            throws PageException {
        HttpMethod method = new GetMethod(aUrl);
        if (getParameters().length > 0) {
            String oldQueryString = method.getQueryString();
            method.setQueryString(getParameters());
            String queryString = method.getQueryString();
            if (oldQueryString.length() > 0) {
                queryString = queryString + '&' + oldQueryString;
                method.setQueryString(queryString);
            }
        }
        try {
            return executeMethod(aClient, method);
        } catch (TransformerException e) {
            throw new PageException(e.getMessage(), e);
        } catch (IOException e) { 
            throw new PageException(e.getMessage(), e);
        }
    }

}