/*
 * 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 org.apache.commons.httpclient.NameValuePair;


/**
 * The object that actually obtains pages based on URL. 
 */
public interface Crawler {

    /**
     * Gets the content for a specific page. 
     * @param aUrl Url of page. 
     * @param aParameters Paremeters to supply. 
     * @return Page to retrieve.
     * @throws PageException In case of problems retrieving the page.
     */
    Page getPage(String aUrl, NameValuePair[] aParameters) throws PageException;
    
    /**
     * Gets the content for a specific page. 
     * @param aUrl Url of page.
     * @param aParameters Parameters to supply. 
     * @param aType Type of page.  
     * @return Page.
     * @throws PageException In case of problems retrieving the page. 
     */
    Page getPage(String aUrl, NameValuePair[] aParameters, PageType aType) throws PageException; 
}