add SubPageProcessor #86

webmagic-extension/src/main/java/us/codecraft/webmagic/handler/CompositePageProcessor.java

+package us.codecraft.webmagic.handler;
+
+import us.codecraft.webmagic.Page;
+import us.codecraft.webmagic.Site;
+import us.codecraft.webmagic.processor.PageProcessor;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author code4crafter@gmail.com
+ * @date 14-4-5
+ */
+public class CompositePageProcessor implements PageProcessor {
+
+    private Site site;
+
+    private List<SubPageProcessor> subPageProcessors;
+
+    @Override
+    public void process(Page page) {
+        for (SubPageProcessor subPageProcessor : subPageProcessors) {
+            if (subPageProcessor.match(page)) {
+                SubPageProcessor.MatchOtherProcessor matchOtherProcessorProcessor = subPageProcessor.process(page);
+                if (matchOtherProcessorProcessor == null || matchOtherProcessorProcessor != SubPageProcessor.MatchOtherProcessor.YES) {
+                    return;
+                }
+            }
+        }
+    }
+
+    public CompositePageProcessor setSite(Site site) {
+        this.site = site;
+        return this;
+    }
+
+    public CompositePageProcessor setSubPageProcessors(SubPageProcessor... subPageProcessors) {
+        this.subPageProcessors = new ArrayList<SubPageProcessor>();
+        for (SubPageProcessor subPageProcessor : subPageProcessors) {
+            this.subPageProcessors.add(subPageProcessor);
+        }
+        return this;
+    }
+
+    @Override
+    public Site getSite() {
+        return site;
+    }
+}

webmagic-extension/src/main/java/us/codecraft/webmagic/handler/SubPageProcessor.java

+package us.codecraft.webmagic.handler;
+
+import us.codecraft.webmagic.Page;
+
+/**
+ * @author code4crafter@gmail.com
+ * @date 14-4-5
+ */
+public interface SubPageProcessor {
+
+    /**
+     * Check whether the SubPageProcessor can process the page.<br></br>
+     * Please DO NOT change page status in this method.
+     *
+     * @param page
+     * @return
+     */
+    public boolean match(Page page);
+
+    /**
+     *
+     * process the page, extract urls to fetch, extract the data and store
+     *
+     * @param page
+     * @return whether continue to match
+     */
+    public MatchOtherProcessor process(Page page);
+
+    public enum MatchOtherProcessor {
+        YES, NO;
+    }
+
+}