public void AddEntityType <T>(ITargetUrlsExtractor targetUrlsExtractor, IDataHandler <T> dataHandler, string tableName) where T : ISpiderEntity
{
CheckIfRunning();
EntityProcessor <T> processor = new EntityProcessor <T>(targetUrlsExtractor, dataHandler, tableName);
AddPageProcessor(processor);
}
/// <summary>
/// 添加爬虫实体类
/// </summary>
/// <typeparam name="T">爬虫实体类的类型, 必须继承自 ISpiderEntity</typeparam>
/// <param name="targetUrlsExtractor">目标链接的解析、筛选器</param>
/// <param name="dataHandler">对解析的结果进一步加工操作</param>
public void AddEntityType <T>(ITargetUrlsExtractor targetUrlsExtractor, IDataHandler dataHandler) where T : new()
{
CheckIfRunning();
var processor = new EntityProcessor <T>(UseEntityModelExtrator ? null : new ModelExtractor(), targetUrlsExtractor, dataHandler);
AddPageProcessors(processor);
}
/// <summary>
/// 构造方法
/// </summary>
/// <param name="extractor">爬虫实体的解析器</param>
/// <param name="targetUrlsExtractor">目标链接的解析、筛选器</param>
/// <param name="dataHandler">对解析的结果进一步加工操作</param>
/// <param name="tableName">实体在数据库中的表名, 此优先级高于EntitySelector中的定义</param>
public EntityProcessor(IEntityExtractor <T> extractor, ITargetUrlsExtractor targetUrlsExtractor, IDataHandler <T> dataHandler, string tableName)
{
if (extractor == null)
{
Extractor = new EntityExtractor <T>(dataHandler, tableName);
}
else
{
Extractor = extractor;
}
if (targetUrlsExtractor != null)
{
TargetUrlsExtractor = targetUrlsExtractor;
}
RegionAndPatternTargetUrlsExtractor regionAndPatternTargetUrlsExtractor;
if (TargetUrlsExtractor == null)
{
regionAndPatternTargetUrlsExtractor = new RegionAndPatternTargetUrlsExtractor();
TargetUrlsExtractor = regionAndPatternTargetUrlsExtractor;
}
else
{
regionAndPatternTargetUrlsExtractor = TargetUrlsExtractor as RegionAndPatternTargetUrlsExtractor;
}
if (regionAndPatternTargetUrlsExtractor == null)
{
return;
}
if (Extractor.EntityDefine.TargetUrlsSelectors != null && Extractor.EntityDefine.TargetUrlsSelectors.Count > 0)
{
foreach (var targetUrlsSelector in Extractor.EntityDefine.TargetUrlsSelectors)
{
var patterns = targetUrlsSelector.Patterns?.Select(x => x?.Trim()).Distinct().ToArray();
var xpaths = targetUrlsSelector.XPaths?.Select(x => x?.Trim()).Distinct().ToList();
if (xpaths == null && patterns == null)
{
throw new SpiderException("Region xpath and patterns should not be null both");
}
if (xpaths != null && xpaths.Count > 0)
{
foreach (var xpath in xpaths)
{
regionAndPatternTargetUrlsExtractor.AddTargetUrlExtractor(xpath, patterns);
}
}
else
{
if (patterns != null && patterns.Length > 0)
{
regionAndPatternTargetUrlsExtractor.AddTargetUrlExtractor(null, patterns);
}
}
}
}
}
/// <summary>
/// Construct a <see cref="TargetUrlsHandler"/> instance.
/// </summary>
/// <summary xml:lang="zh-CN">
/// 构造方法
/// </summary>
/// <param name="targetUrlsExtractor">目标链接解析器 <see cref="ITargetUrlsExtractor"/></param>
/// <param name="extractByProcessor">Processor是否还需要执行目标链接解析工作(Should <see cref="IPageProcessor"/> continue to execute <see cref="ITargetUrlsExtractor"/>)</param>
public TargetUrlsHandler(ITargetUrlsExtractor targetUrlsExtractor, bool extractByProcessor = false)
{
_targetUrlsExtractor = targetUrlsExtractor;
if (targetUrlsExtractor == null)
{
throw new ArgumentNullException(nameof(targetUrlsExtractor));
}
_extractByProcessor = extractByProcessor;
}
public bool IsTermination(Page page, ITargetUrlsExtractor creator)
{
if (TotalPageSelector == null || CurrenctPageSelector == null)
{
throw new SpiderException("Total page selector or current page selector should not be null.");
}
if (string.IsNullOrEmpty(page?.Content))
{
return(false);
}
var totalStr = GetSelectorValue(page, TotalPageSelector);
var currentStr = GetSelectorValue(page, CurrenctPageSelector);
return(currentStr == totalStr);
}
public void AddEntityType <T>(ITargetUrlsExtractor targetUrlsExtractor, IDataHandler <T> dataHandler) where T : ISpiderEntity
{
AddEntityType(targetUrlsExtractor, dataHandler, null);
}
public void AddEntityType <T>(ITargetUrlsExtractor targetUrlsExtractor) where T : ISpiderEntity
{
AddEntityType <T>(targetUrlsExtractor, null, null);
}
/// <summary>
/// 添加爬虫实体类
/// </summary>
/// <typeparam name="T">爬虫实体类的类型, 必须继承自 ISpiderEntity</typeparam>
/// <param name="targetUrlsExtractor">目标链接的解析、筛选器</param>
public void AddEntityType <T>(ITargetUrlsExtractor targetUrlsExtractor) where T : new()
{
AddEntityType <T>(targetUrlsExtractor, null);
}
/// <summary>
/// 构造方法
/// </summary>
/// <param name="extractor">爬虫实体的解析器</param>
/// <param name="targetUrlsExtractor">目标链接的解析、筛选器</param>
/// <param name="dataHandlers">对解析的结果进一步加工操作</param>
public EntityProcessor(IModelExtractor extractor = null, ITargetUrlsExtractor targetUrlsExtractor = null, params IDataHandler[] dataHandlers)
: base(new ModelDefine <T>(), extractor ?? new ModelExtractor <T>(), targetUrlsExtractor, dataHandlers)
{
}
/// <summary>
/// 构造方法
/// </summary>
/// <param name="targetUrlsExtractor">目标链接的解析、筛选器</param>
/// <param name="dataHandler">对解析的结果进一步加工操作</param>
/// <param name="tableName">实体在数据库中的表名, 此优先级高于EntitySelector中的定义</param>
public EntityProcessor(ITargetUrlsExtractor targetUrlsExtractor, IDataHandler <T> dataHandler, string tableName) : this(null, targetUrlsExtractor, dataHandler, tableName)
{
}
/// <summary>
/// 构造方法
/// </summary>
/// <param name="targetUrlsExtractor">目标链接的解析、筛选器</param>
public EntityProcessor(ITargetUrlsExtractor targetUrlsExtractor) : this(null, targetUrlsExtractor, null, null)
{
}
/// <summary>
/// 构造方法
/// </summary>
/// <param name="extractor">爬虫实体的解析器</param>
/// <param name="targetUrlsExtractor">目标链接的解析、筛选器</param>
/// <param name="dataHandler">对解析的结果进一步加工操作</param>
/// <param name="tableName">实体在数据库中的表名, 此优先级高于EntitySelector中的定义</param>
public ModelProcessor(IModel model, IModelExtractor extractor = null, ITargetUrlsExtractor targetUrlsExtractor = null, params IDataHandler[] dataHandlers)
{
Model = model ?? throw new ArgumentNullException($"{nameof(model)} should not be null.");
Extractor = extractor ?? new ModelExtractor();
if (targetUrlsExtractor != null)
{
TargetUrlsExtractor = targetUrlsExtractor;
}
RegionAndPatternTargetUrlsExtractor regionAndPatternTargetUrlsExtractor;
if (TargetUrlsExtractor == null)
{
regionAndPatternTargetUrlsExtractor = new RegionAndPatternTargetUrlsExtractor();
TargetUrlsExtractor = regionAndPatternTargetUrlsExtractor;
}
else
{
regionAndPatternTargetUrlsExtractor = TargetUrlsExtractor as RegionAndPatternTargetUrlsExtractor;
}
if (regionAndPatternTargetUrlsExtractor == null)
{
return;
}
if (Model.TargetUrlsSelectors != null && Model.TargetUrlsSelectors.Count() > 0)
{
foreach (var targetUrlsSelector in Model.TargetUrlsSelectors)
{
var patterns = targetUrlsSelector.Patterns?.Select(x => x?.Trim()).Distinct().ToArray();
var xpaths = targetUrlsSelector.XPaths?.Select(x => x?.Trim()).Distinct().ToList();
if (xpaths == null && patterns == null)
{
throw new SpiderException("Region xpath and patterns should not be null both");
}
if (xpaths != null && xpaths.Count > 0)
{
foreach (var xpath in xpaths)
{
regionAndPatternTargetUrlsExtractor.AddTargetUrlExtractor(xpath, patterns);
}
}
else
{
if (patterns != null && patterns.Length > 0)
{
regionAndPatternTargetUrlsExtractor.AddTargetUrlExtractor(null, patterns);
}
}
}
}
if (dataHandlers != null)
{
foreach (var datahandler in dataHandlers)
{
if (datahandler != null)
{
_dataHandlers.Add(datahandler);
}
}
}
}