?? httpmidfetchunchangedfilter.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.5.0_07) on Sun May 06 17:59:55 GMT 2007 --><TITLE>HTTPMidFetchUnchangedFilter (Heritrix 1.12.1)</TITLE><META NAME="keywords" CONTENT="org.archive.crawler.filter.HTTPMidFetchUnchangedFilter class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="HTTPMidFetchUnchangedFilter (Heritrix 1.12.1)";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/HTTPMidFetchUnchangedFilter.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../org/archive/crawler/filter/HopsFilter.html" title="class in org.archive.crawler.filter"><B>PREV CLASS</B></A> <A HREF="../../../../org/archive/crawler/filter/OrFilter.html" title="class in org.archive.crawler.filter"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html?org/archive/crawler/filter/HTTPMidFetchUnchangedFilter.html" target="_top"><B>FRAMES</B></A> <A HREF="HTTPMidFetchUnchangedFilter.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: <A HREF="#nested_classes_inherited_from_class_org.archive.crawler.settings.ComplexType">NESTED</A> | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">org.archive.crawler.filter</FONT><BR>Class HTTPMidFetchUnchangedFilter</H2><PRE>java.lang.Object <IMG SRC="../../../../resources/inherit.gif" ALT="extended by ">javax.management.Attribute <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../org/archive/crawler/settings/Type.html" title="class in org.archive.crawler.settings">org.archive.crawler.settings.Type</A> <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../org/archive/crawler/settings/ComplexType.html" title="class in org.archive.crawler.settings">org.archive.crawler.settings.ComplexType</A> <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../org/archive/crawler/settings/ModuleType.html" title="class in org.archive.crawler.settings">org.archive.crawler.settings.ModuleType</A> <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../org/archive/crawler/framework/Filter.html" title="class in org.archive.crawler.framework">org.archive.crawler.framework.Filter</A> <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.archive.crawler.filter.HTTPMidFetchUnchangedFilter</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD>java.io.Serializable, javax.management.DynamicMBean, <A HREF="../../../../org/archive/crawler/datamodel/CoreAttributeConstants.html" title="interface in org.archive.crawler.datamodel">CoreAttributeConstants</A>, <A HREF="../../../../org/archive/crawler/frontier/AdaptiveRevisitAttributeConstants.html" title="interface in org.archive.crawler.frontier">AdaptiveRevisitAttributeConstants</A></DD></DL><HR><DL><DT><PRE>public class <B>HTTPMidFetchUnchangedFilter</B><DT>extends <A HREF="../../../../org/archive/crawler/framework/Filter.html" title="class in org.archive.crawler.framework">Filter</A><DT>implements <A HREF="../../../../org/archive/crawler/frontier/AdaptiveRevisitAttributeConstants.html" title="interface in org.archive.crawler.frontier">AdaptiveRevisitAttributeConstants</A></DL></PRE><P>A mid fetch filter for HTTP fetcher processors. It will evaluate the HTTP header to try and predict if the document has changed since it last passed through this filter. It does this by comparing the last-modified and etag values with the same values stored during the last processing of the URI. <p> If both values are present, they must agree on predicting no change, otherwise a change is predicted (return true). <p> If only one of the values is present, it alone is used to predict if a change has occured. <p> If neither value is present the filter will return true (predict change)<P><P><DL><DT><B>Author:</B></DT> <DD>Kristinn Sigurdsson</DD><DT><B>See Also:</B><DD><A HREF="../../../../serialized-form.html#org.archive.crawler.filter.HTTPMidFetchUnchangedFilter">Serialized Form</A></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><A NAME="nested_class_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Nested Class Summary</B></FONT></TH></TR></TABLE> <A NAME="nested_classes_inherited_from_class_org.archive.crawler.settings.ComplexType"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TH ALIGN="left"><B>Nested classes/interfaces inherited from class org.archive.crawler.settings.<A HREF="../../../../org/archive/crawler/settings/ComplexType.html" title="class in org.archive.crawler.settings">ComplexType</A></B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../../org/archive/crawler/settings/ComplexType.MBeanAttributeInfoIterator.html" title="class in org.archive.crawler.settings">ComplexType.MBeanAttributeInfoIterator</A></CODE></TD></TR></TABLE> <!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Field Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/archive/crawler/filter/HTTPMidFetchUnchangedFilter.html#HEADER_PREDICTS_CHANGED">HEADER_PREDICTS_CHANGED</A></B></CODE>?? 快捷鍵說明
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