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complete formatter refactor by ObjectFormatterBuilder #586

master
yihua.huang 2017-06-03 22:07:53 +08:00
parent b1ef61b278
commit a6f8ed5476
5 changed files with 69 additions and 59 deletions
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51
webmagic-extension/src/main/java/us/codecraft/webmagic/model/PageModelExtractor.java
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@ -5,9 +5,8 @@ import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import us.codecraft.webmagic.Page;
import us.codecraft.webmagic.model.annotation.*;
import us.codecraft.webmagic.model.formatter.BasicTypeFormatter;
import us.codecraft.webmagic.model.formatter.ObjectFormatter;
import us.codecraft.webmagic.model.formatter.ObjectFormatters;
import us.codecraft.webmagic.model.formatter.ObjectFormatterBuilder;
import us.codecraft.webmagic.selector.*;
import us.codecraft.webmagic.utils.ClassUtils;
import us.codecraft.webmagic.utils.ExtractorUtils;
@ -70,58 +69,12 @@ class PageModelExtractor {
fieldExtractor = fieldExtractorTmp;
}
if (fieldExtractor != null) {
checkFormat(field, fieldExtractor);
fieldExtractor.setObjectFormatter(new ObjectFormatterBuilder().setField(field).build());
fieldExtractors.add(fieldExtractor);
}
}
}
private void checkFormat(Field field, FieldExtractor fieldExtractor) {
//check custom formatter
Formatter formatter = field.getAnnotation(Formatter.class);
if (formatter == null) {
return;
}
if (!formatter.formatter().equals(Formatter.DEFAULT_FORMATTER)) {
ObjectFormatter objectFormatter = initFormatter(formatter.formatter(), formatter.value());
fieldExtractor.setObjectFormatter(objectFormatter);
return;
}
if (!fieldExtractor.isMulti() && !String.class.isAssignableFrom(field.getType())) {
Class<?> fieldClazz = BasicTypeFormatter.detectBasicClass(field.getType());
ObjectFormatter objectFormatter = initFormatter(ObjectFormatters.get(fieldClazz), formatter.value());
if (objectFormatter == null) {
throw new IllegalStateException("Can't find formatter for field " + field.getName() + " of type " + fieldClazz);
} else {
fieldExtractor.setObjectFormatter(objectFormatter);
}
} else if (fieldExtractor.isMulti()) {
if (!List.class.isAssignableFrom(field.getType())) {
throw new IllegalStateException("Field " + field.getName() + " must be list");
}
if (!formatter.subClazz().equals(Void.class)) {
ObjectFormatter objectFormatter = initFormatter(ObjectFormatters.get(formatter.subClazz()), formatter.value());
if (objectFormatter == null) {
throw new IllegalStateException("Can't find formatter for field " + field.getName() + " of type " + formatter.subClazz());
} else {
fieldExtractor.setObjectFormatter(objectFormatter);
}
}
}
}
private ObjectFormatter initFormatter(Class<? extends ObjectFormatter> formatterClazz, String[] params) {
try {
ObjectFormatter objectFormatter = formatterClazz.newInstance();
objectFormatter.initParam(params);
return objectFormatter;
} catch (InstantiationException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
private FieldExtractor getAnnotationExtractByUrl(Class clazz, Field field) {
FieldExtractor fieldExtractor = null;
ExtractByUrl extractByUrl = field.getAnnotation(ExtractByUrl.class);

56
webmagic-extension/src/main/java/us/codecraft/webmagic/model/formatter/ObjectFormatterBuilder.java 100644
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@ -0,0 +1,56 @@
package us.codecraft.webmagic.model.formatter;
import us.codecraft.webmagic.model.annotation.Formatter;
import java.lang.reflect.Field;
import java.util.List;
/**
* @author code4crafter@gmail.com
* @since 0.7.0
* Date: 2017/6/3
*/
public class ObjectFormatterBuilder {
private Field field;
public ObjectFormatterBuilder setField(Field field) {
this.field = field;
return this;
}
private ObjectFormatter initFormatterForType(Class<?> fieldClazz, String[] params) {
if (fieldClazz.equals(String.class) || List.class.isAssignableFrom(fieldClazz)){
return null;
}
Class<? extends ObjectFormatter> formatterClass = ObjectFormatters.get(BasicTypeFormatter.detectBasicClass(fieldClazz));
if (formatterClass == null) {
throw new IllegalStateException("Can't find formatter for field " + field.getName() + " of type " + fieldClazz);
}
return initFormatter(formatterClass, params);
}
private ObjectFormatter initFormatter(Class<? extends ObjectFormatter> formatterClazz, String[] params) {
try {
ObjectFormatter objectFormatter = formatterClazz.newInstance();
objectFormatter.initParam(params);
return objectFormatter;
} catch (InstantiationException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
public ObjectFormatter build() {
Formatter formatter = field.getAnnotation(Formatter.class);
if (formatter != null && !formatter.formatter().equals(Formatter.DEFAULT_FORMATTER)) {
return initFormatter(formatter.formatter(), formatter.value());
}
if (formatter == null || formatter.subClazz().equals(Void.class)) {
return initFormatterForType(field.getType(), formatter != null ? formatter.value() : null);
} else {
return initFormatterForType(formatter.subClazz(), formatter.value());
}
}
}

4
webmagic-extension/src/main/java/us/codecraft/webmagic/model/formatter/ObjectFormatters.java
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@ -22,9 +22,9 @@ public class ObjectFormatters {
try {
formatterMap.put(objectFormatter.newInstance().clazz(), objectFormatter);
} catch (InstantiationException e) {
e.printStackTrace();
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}

9
webmagic-extension/src/test/java/us/codecraft/webmagic/model/PageModelExtractorTest.java
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@ -1,6 +1,7 @@
package us.codecraft.webmagic.model;
import org.apache.commons.lang3.time.DateFormatUtils;
import org.apache.commons.lang3.time.DateUtils;
import org.junit.Test;
import us.codecraft.webmagic.model.annotation.ExtractBy;
import us.codecraft.webmagic.model.annotation.Formatter;
@ -44,7 +45,7 @@ public class PageModelExtractorTest {
public static class ModelStringList {
@ExtractBy("//a/@href")
@ExtractBy("//li[@class='list']/a/@href")
private List<String> links;
}
@ -86,18 +87,18 @@ public class PageModelExtractorTest {
@Test
public void testExtractList() throws Exception {
ModelStringList modelDate = (ModelStringList) PageModelExtractor.create(ModelStringList.class).process(pageMocker.getMockPage());
assertThat(modelDate.links).hasSize(8);
assertThat(modelDate.links).containsExactly("http://webmagic.io/list/1","http://webmagic.io/list/2","http://webmagic.io/list/3","http://webmagic.io/list/4");
}
@Test
public void testExtractIntList() throws Exception {
ModelIntList modelDate = (ModelIntList) PageModelExtractor.create(ModelIntList.class).process(pageMocker.getMockPage());
assertThat(modelDate.numbers).hasSize(4);
assertThat(modelDate.numbers).containsExactly(1,2,3,4);
}
@Test
public void testExtractDateList() throws Exception {
ModelDateList modelDate = (ModelDateList) PageModelExtractor.create(ModelDateList.class).process(pageMocker.getMockPage());
assertThat(modelDate.dates).hasSize(4);
assertThat(modelDate.dates).containsExactly(DateUtils.parseDate("20170601", "yyyyMMdd"), DateUtils.parseDate("20170602", "yyyyMMdd"), DateUtils.parseDate("20170603", "yyyyMMdd"), DateUtils.parseDate("20170604", "yyyyMMdd"));
}
}

8
webmagic-extension/src/test/resources/html/mock-webmagic.html
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@ -10,14 +10,14 @@
<ul>
<li class="list"><a href="http://webmagic.io/list/1"></a></li>
<li class="list"><a href="http://webmagic.io/list/2"></a></li>
<li class="list"><a href="http://webmagic.io/post/3"></a></li>
<li class="list"><a href="http://webmagic.io/post/4"></a></li>
<li class="list"><a href="http://webmagic.io/list/3"></a></li>
<li class="list"><a href="http://webmagic.io/list/4"></a></li>
</ul>
<ul>
<li class="post"><a href="http://webmagic.io/post/1"></a></li>
<li class="post"><a href="http://webmagic.io/post/2"></a></li>
<li class="post"><a href="http://webmagic.io/list/3"></a></li>
<li class="post"><a href="http://webmagic.io/list/4"></a></li>
<li class="post"><a href="http://webmagic.io/post/3"></a></li>
<li class="post"><a href="http://webmagic.io/post/4"></a></li>
</ul>
<ul>
<li class="numbers">1</li>