refactor in selectors

webmagic-core/src/main/java/us/codecraft/webmagic/selector/Html.java

 package us.codecraft.webmagic.selector;
 
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+
 import java.util.ArrayList;
 import java.util.List;
 
@@ -11,12 +14,23 @@ import java.util.List;
  */
 public class Html extends PlainText {
 
+    /**
+     * Store parsed document for better performance when only one text exist.
+     */
+    private Document document;
+
     public Html(List<String> strings) {
         super(strings);
     }
 
     public Html(String text) {
         super(text);
+        this.document = Jsoup.parse(text);
+    }
+
+    public Html(Document document) {
+        super(document.html());
+        this.document = document;
     }
 
     public static Html create(String text) {
@@ -53,38 +67,34 @@ public class Html extends PlainText {
 
     @Override
     public Selectable links() {
-        XsoupSelector xpathSelector = new XsoupSelector("//a/@href");
-        return selectList(xpathSelector, strings);
+        return xpath("//a/@href");
     }
 
     @Override
     public Selectable xpath(String xpath) {
-        XsoupSelector xpathSelector = new XsoupSelector(xpath);
-        return selectList(xpathSelector, strings);
+        XsoupSelector xsoupSelector = new XsoupSelector(xpath);
+        if (document!=null){
+            return new Html(xsoupSelector.selectList(document));
+        }
+        return selectList(xsoupSelector, strings);
     }
 
     @Override
     public Selectable $(String selector) {
         CssSelector cssSelector = Selectors.$(selector);
+        if (document!=null){
+            return new Html(cssSelector.selectList(document));
+        }
         return selectList(cssSelector, strings);
     }
 
     @Override
     public Selectable $(String selector, String attrName) {
         CssSelector cssSelector = Selectors.$(selector, attrName);
-        return selectList(cssSelector, strings);
-    }
-
-    @Override
-    public Selectable text() {
-        TextContentSelector selector = Selectors.text();
-        return select(selector, strings);
+        if (document!=null){
+            return new Html(cssSelector.selectList(document));
         }
-
-    @Override
-    public Selectable text(String newlineSeparator) {
-        TextContentSelector selector = Selectors.text(newlineSeparator);
-        return select(selector, strings);
+        return selectList(cssSelector, strings);
     }
 
 }

webmagic-core/src/main/java/us/codecraft/webmagic/selector/PlainText.java

@@ -89,7 +89,7 @@ public class PlainText implements Selectable {
 
     @Override
     public Selectable replace(String regex, String replacement) {
-        ReplaceSelector replaceSelector = SelectorFactory.getInstatnce().newReplaceSelector(regex, replacement);
+        ReplaceSelector replaceSelector = new ReplaceSelector(regex,replacement);
         return select(replaceSelector, strings);
     }
 
@@ -107,18 +107,6 @@ public class PlainText implements Selectable {
         }
     }
 
-    @Override
-    public Selectable text() {
-        //do nothing
-        return this;
-    }
-
-    @Override
-    public Selectable text(String newlineSeparator) {
-        //do nothing
-        return this;
-    }
-
     @Override
     public boolean match() {
         return strings != null && strings.size() > 0;

webmagic-core/src/main/java/us/codecraft/webmagic/selector/Selectable.java

@@ -82,20 +82,6 @@ public interface Selectable {
      */
     public String toString();
 
-    /**
-     * select text content of html
-     *
-     * @return text
-     */
-    public Selectable text();
-
-    /**
-     * select text content of html
-     *
-     * @return text
-     */
-    public Selectable text(String newlineSeparator);
-
     /**
      * if result exist for select
      *

webmagic-core/src/main/java/us/codecraft/webmagic/selector/SelectorFactory.java

-package us.codecraft.webmagic.selector;
-
-import org.apache.commons.lang3.StringUtils;
-
-import java.lang.reflect.Constructor;
-import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
-
-/**
- * Selector factory with some inner cache.<br>
- *
- * @author code4crafter@gmail.com <br>
- * @since 0.1.0
- */
-public class SelectorFactory {
-
-    private Map<String, Selector> innerCache = new ConcurrentHashMap<String, Selector>();
-
-    private static final SelectorFactory INSTATNCE = new SelectorFactory();
-
-    public static SelectorFactory getInstatnce() {
-        return INSTATNCE;
-    }
-
-    public RegexSelector newRegexSelector(String regex) {
-        return newSelector(RegexSelector.class, regex);
-    }
-
-    public RegexSelector newRegexSelector(String regex, int group) {
-        String cacheKey = getCacheKey(RegexSelector.class, regex, String.valueOf(group));
-        if (innerCache.get(cacheKey) != null) {
-            return (RegexSelector) innerCache.get(cacheKey);
-        }
-        return new RegexSelector(regex, group);
-    }
-
-    public ReplaceSelector newReplaceSelector(String regex, String replacement) {
-        return newSelector(ReplaceSelector.class, regex, replacement);
-    }
-
-    public XpathSelector newXpathSelector(String xpath) {
-        return newSelector(XpathSelector.class, xpath);
-    }
-
-    public SmartContentSelector newSmartContentSelector() {
-        return newSelector(SmartContentSelector.class);
-    }
-
-    public <T extends Selector> T newAndCacheSelector(Class<T> clazz, String... param) {
-        String cacheKey = getCacheKey(RegexSelector.class, param);
-        if (innerCache.get(cacheKey) != null) {
-            return (T) innerCache.get(cacheKey);
-        }
-        T selector = newSelector(clazz, param);
-        if (selector != null) {
-            innerCache.put(cacheKey, selector);
-        }
-        return selector;
-
-    }
-
-    public <T extends Selector> T newSelector(Class<T> clazz, String... param) {
-        try {
-            if (param.length == 0) {
-                Constructor<T> constructor
-                        = clazz.getConstructor();
-                T selector = constructor.newInstance();
-                return selector;
-            } else if (param.length == 1) {
-                Constructor<T> constructor
-                        = clazz.getConstructor(String.class);
-                T selector = constructor.newInstance(param[0]);
-                return selector;
-            } else if (param.length == 2) {
-                Constructor<T> constructor
-                        = clazz.getConstructor(String.class, String.class);
-                T selector = constructor.newInstance(param[0], param[1]);
-                return selector;
-            } else {
-                throw new UnsupportedOperationException();
-            }
-        } catch (Exception e) {
-            throw new IllegalArgumentException("init object error", e);
-        }
-    }
-
-    private String getCacheKey(Class<?> clazz, String... param) {
-        return clazz.toString() + "_" + StringUtils.join(param, "_");
-    }
-
-}

webmagic-core/src/main/java/us/codecraft/webmagic/selector/Selectors.java

@@ -9,15 +9,15 @@ package us.codecraft.webmagic.selector;
 public abstract class Selectors {
 
     public static RegexSelector regex(String expr) {
-        return SelectorFactory.getInstatnce().newRegexSelector(expr);
+        return new RegexSelector(expr);
     }
 
     public static RegexSelector regex(String expr, int group) {
-        return SelectorFactory.getInstatnce().newRegexSelector(expr, group);
+        return new RegexSelector(expr,group);
     }
 
     public static SmartContentSelector smartContent() {
-        return SelectorFactory.getInstatnce().newSmartContentSelector();
+        return new SmartContentSelector();
     }
 
     public static CssSelector $(String expr) {
@@ -29,7 +29,11 @@ public abstract class Selectors {
     }
 
     public static XpathSelector xpath(String expr) {
-        return SelectorFactory.getInstatnce().newXpathSelector(expr);
+        return new XpathSelector(expr);
+    }
+
+    public static XsoupSelector xsoup(String expr) {
+        return new XsoupSelector(expr);
     }
 
     public static AndSelector and(Selector... selectors) {
@@ -40,14 +44,6 @@ public abstract class Selectors {
         return new OrSelector(selectors);
     }
 
-    public static TextContentSelector text() {
-        return new TextContentSelector();
-    }
-
-    public static TextContentSelector text(String newlineSeperator) {
-        return new TextContentSelector(newlineSeperator);
-    }
-
     public static void main(String[] args) {
         String s = "a";
         or(regex("<title>(.*)</title>"), xpath("//title"), $("title")).select(s);

webmagic-core/src/main/java/us/codecraft/webmagic/selector/TextContentSelector.java

-package us.codecraft.webmagic.selector;
-
-import org.jsoup.Jsoup;
-import org.jsoup.nodes.Document;
-import org.jsoup.nodes.Element;
-
-import java.util.Arrays;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Set;
-
-/**
- * Extract text content in html.<br>
- * Algorithm from <a href="http://www.elias.cn/En/ExtMainText">http://www.elias.cn/En/ExtMainText</a>. <br>
- *
- * @author code4crafter@gmail.com <br>
- * @since 0.2.2
- */
-public class TextContentSelector implements Selector {
-
-    private String newLineSeperator = "\n";
-
-    public TextContentSelector() {
-    }
-
-    public TextContentSelector(String newLineSeperator) {
-        this.newLineSeperator = newLineSeperator;
-    }
-
-    private final static Set<String> TAGS_IN_NEWLINE = new HashSet<String>();
-
-    private final static Set<String> TAGS_TO_IGNORE = new HashSet<String>();
-
-    static {
-        TAGS_IN_NEWLINE.addAll(Arrays.asList(new String[]{"p", "div", "h1", "h2", "h3", "h4", "h5", "h6", "br", "li"}));
-        TAGS_TO_IGNORE.addAll(Arrays.asList(new String[]{"head", "style", "script", "noscript", "option"}));
-    }
-
-    @Override
-    public String select(String text) {
-        Document doc = Jsoup.parse(text);
-        return select0(doc);
-    }
-
-    protected String select0(Element element) {
-        String tagName = element.tagName().toLowerCase();
-        if (TAGS_TO_IGNORE.contains(tagName)) {
-            return "";
-        }
-        StringBuilder textBuilder = new StringBuilder();
-        textBuilder.append(element.text());
-        if (element.children() != null) {
-            for (Element child : element.children()) {
-                textBuilder.append(select0(child));
-            }
-        }
-        if (TAGS_IN_NEWLINE.contains(tagName)) {
-            textBuilder.append(newLineSeperator);
-        }
-        return textBuilder.toString();
-    }
-
-    @Override
-    public List<String> selectList(String text) {
-        throw new UnsupportedOperationException();
-    }
-
-}

webmagic-core/src/test/java/us/codecraft/webmagic/selector/TextContentSelectorTest.java

-package us.codecraft.webmagic.selector;
-
-import junit.framework.Assert;
-import org.junit.Ignore;
-import org.junit.Test;
-import us.codecraft.webmagic.downloader.HttpClientDownloader;
-
-/**
- * @author code4crafter@gmail.com <br>
- * @since 0.2.2
- */
-public class TextContentSelectorTest {
-
-    @Test
-    public void test() {
-        String html = "<div class=\"edit-comment-hide\">\n" +
-                "            <div class=\"js-comment-body comment-body markdown-body markdown-format\">\n" +
-                "                <p>Add more powerful selector for content text extract refered to <a href=\"http://www.elias.cn/En/ExtMainText\">http://www.elias.cn/En/ExtMainText</a></p>\n" +
-                "            </div>\n" +
-                "          </div>";
-        TextContentSelector textContentSelector = new TextContentSelector("<br>");
-        String text = textContentSelector.select(html);
-        Assert.assertNotNull(text);
-    }
-
-    @Ignore("takes long time")
-    @Test
-    public void testDownload() {
-        String s = new HttpClientDownloader().download("http://blog.codecraft.us/blog/2013/08/18/ti-yan-dao-liao-open-sourcede-mei-li/", "utf-8")
-                .smartContent().text().toString();
-        Assert.assertNotNull(s);
-    }
-
-}