默认情况下,GWT Place URL包含Place的简单类名(如“HelloPlace”),后跟冒号(:)和PlaceTokenizer返回的标记。
我的问题是如何将“:”更改为“/”?
答案 0 :(得分:30)
我刚创建了自己的PlaceHistoryMapper,它直接实现了接口,而不是使用AbstractPlaceHistoryMapper:
public class AppPlaceHistoryMapper implements PlaceHistoryMapper
{
String delimiter = "/";
@Override
public Place getPlace(String token)
{
String[] tokens = token.split(delimiter, 2);
if (tokens[0].equals("HelloPlace"))
...
}
@Override
public String getToken(Place place)
{
if (place instanceof HelloPlace)
{
return "HelloPlace" + delimiter + whatever;
}
else ...
}
}
这肯定是额外的代码编写,但你可以在一个地方控制你的url结构,并使用斜杠而不是冒号!
答案 1 :(得分:7)
Here is how to customize the delimiter,同时使用标准的GWT位置。 (PlaceHistoryMapper)
没有其他东西需要改变;它适用于使用Places和Tokenizers的标准方法。
插入gwt.xml
<generate-with
class="com.google.gwt.place.rebind.CustomPlaceHistoryMapperGenerator">
<when-type-assignable class="com.google.gwt.place.shared.PlaceHistoryMapper" />
</generate-with>
添加CustomAbstractPlaceHistoryMapper
package com.siderakis.client.mvp;
import com.google.gwt.place.impl.AbstractPlaceHistoryMapper;
import com.google.gwt.place.shared.Place;
import com.google.gwt.place.shared.PlaceTokenizer;
public abstract class CustomAbstractPlaceHistoryMapper extends AbstractPlaceHistoryMapper {
public final static String DELIMITER = "/";
public static class CustomPrefixAndToken extends PrefixAndToken {
public CustomPrefixAndToken(String prefix, String token) {
super(prefix, token);
assert prefix != null && !prefix.contains(DELIMITER);
}
@Override
public String toString() {
return (prefix.length() == 0) ? token : prefix + DELIMITER + token;
}
}
@Override
public Place getPlace(String token) {
int colonAt = token.indexOf(DELIMITER);
String initial;
String rest;
if (colonAt >= 0) {
initial = token.substring(0, colonAt);
rest = token.substring(colonAt + 1);
} else {
initial = "";
rest = token;
}
PlaceTokenizer tokenizer = getTokenizer(initial);
if (tokenizer != null) {
return tokenizer.getPlace(rest);
}
return null;
}
}
添加CustomPlaceHistoryMapperGenerator
/*
* Copyright 2010 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.place.rebind;
import java.io.PrintWriter;
import com.siderakis.client.mvp.CustomAbstractPlaceHistoryMapper;
import com.siderakis.client.mvp.CustomAbstractPlaceHistoryMapper.CustomPrefixAndToken;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.ext.Generator;
import com.google.gwt.core.ext.GeneratorContext;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.JMethod;
import com.google.gwt.place.shared.Place;
import com.google.gwt.place.shared.PlaceTokenizer;
import com.google.gwt.user.rebind.ClassSourceFileComposerFactory;
import com.google.gwt.user.rebind.SourceWriter;
/**
* Generates implementations of
* {@link com.google.gwt.place.shared.PlaceHistoryMapper PlaceHistoryMapper}.
*/
public class CustomPlaceHistoryMapperGenerator extends Generator {
private PlaceHistoryGeneratorContext context;
@Override
public String generate(TreeLogger logger, GeneratorContext generatorContext,
String interfaceName) throws UnableToCompleteException {
context = PlaceHistoryGeneratorContext.create(logger,
generatorContext.getTypeOracle(), interfaceName);
if (context == null) {
return null;
}
PrintWriter out = generatorContext.tryCreate(logger, context.packageName,
context.implName);
if (out != null) {
generateOnce(generatorContext, context, out);
}
return context.packageName + "." + context.implName;
}
private void generateOnce(GeneratorContext generatorContext, PlaceHistoryGeneratorContext context,
PrintWriter out) throws UnableToCompleteException {
TreeLogger logger = context.logger.branch(TreeLogger.DEBUG, String.format(
"Generating implementation of %s", context.interfaceType.getName()));
ClassSourceFileComposerFactory f = new ClassSourceFileComposerFactory(
context.packageName, context.implName);
String superClassName = String.format("%s<%s>",
CustomAbstractPlaceHistoryMapper.class.getSimpleName(),
context.factoryType == null ? "Void" : context.factoryType.getName());
f.setSuperclass(superClassName);
f.addImplementedInterface(context.interfaceType.getName());
f.addImport(CustomAbstractPlaceHistoryMapper.class.getName());
f.addImport(context.interfaceType.getQualifiedSourceName());
f.addImport(CustomAbstractPlaceHistoryMapper.class.getCanonicalName());
if (context.factoryType != null) {
f.addImport(context.factoryType.getQualifiedSourceName());
}
f.addImport(Place.class.getCanonicalName());
f.addImport(PlaceTokenizer.class.getCanonicalName());
f.addImport(CustomPrefixAndToken.class.getCanonicalName());
f.addImport(GWT.class.getCanonicalName());
SourceWriter sw = f.createSourceWriter(generatorContext, out);
sw.println();
writeGetPrefixAndToken(context, sw);
sw.println();
writeGetTokenizer(context, sw);
sw.println();
sw.outdent();
sw.println("}");
generatorContext.commit(logger, out);
}
private void writeGetPrefixAndToken(PlaceHistoryGeneratorContext context,
SourceWriter sw) throws UnableToCompleteException {
sw.println("protected CustomPrefixAndToken getPrefixAndToken(Place newPlace) {");
sw.indent();
for (JClassType placeType : context.getPlaceTypes()) {
String placeTypeName = placeType.getQualifiedSourceName();
String prefix = context.getPrefix(placeType);
sw.println("if (newPlace instanceof " + placeTypeName + ") {");
sw.indent();
sw.println(placeTypeName + " place = (" + placeTypeName + ") newPlace;");
JMethod getter = context.getTokenizerGetter(prefix);
if (getter != null) {
sw.println(String.format("return new CustomPrefixAndToken(\"%s\", "
+ "factory.%s().getToken(place));", escape(prefix),
getter.getName()));
} else {
sw.println(String.format(
"PlaceTokenizer<%s> t = GWT.create(%s.class);", placeTypeName,
context.getTokenizerType(prefix).getQualifiedSourceName()));
sw.println(String.format("return new CustomPrefixAndToken(\"%s\", "
+ "t.getToken((%s) place));", escape(prefix), placeTypeName));
}
sw.outdent();
sw.println("}");
}
sw.println("return null;");
sw.outdent();
sw.println("}");
}
private void writeGetTokenizer(PlaceHistoryGeneratorContext context,
SourceWriter sw) throws UnableToCompleteException {
sw.println("protected PlaceTokenizer getTokenizer(String prefix) {");
sw.indent();
for (String prefix : context.getPrefixes()) {
JMethod getter = context.getTokenizerGetter(prefix);
sw.println("if (\"" + escape(prefix) + "\".equals(prefix)) {");
sw.indent();
if (getter != null) {
sw.println("return factory." + getter.getName() + "();");
} else {
sw.println(String.format("return GWT.create(%s.class);",
context.getTokenizerType(prefix).getQualifiedSourceName()));
}
sw.outdent();
sw.println("}");
}
sw.println("return null;");
sw.outdent();
sw.println("}");
sw.outdent();
}
}
答案 2 :(得分:4)
好问题。问题是,这是硬编码到AbstractPlaceHistoryMapper
:
AbstractPlaceHistoryMapper.PrefixAndToken.toString():
return (prefix.length() == 0) ? token : prefix + ":" + token;
AbstractPlaceHistoryMapper.getPlace(String token):
int colonAt = token.indexOf(':');
...
AbstractPlaceHistoryMapper被硬编码到PlaceHistoryMapperGenerator
。
可能可以通过提供自己的模块xml文件来交换生成器,并重新配置绑定,但总的来说,我认为这“基本上不可配置”。 (但是,如果没有声明性的Tokenizer配置,请参阅Riley的答案!)
答案 3 :(得分:2)
)
我非常感谢答案,谢谢你让我优化了我的时间(我在调试器中跟随我的getToken()方法被调用,并且它正在通过听众,处理程序,魔术师和类似的有趣的东西:-) < / p>
因此,想想HistoryMapper是完美的,但是如果你想添加一个爬虫的解决方案要简单得多,因为你只需要添加额外的'!'书签哈希#!
之后所以只需用额外的字符装饰原始结果即可。
public class PlaceHistoryMapperDecorator implements PlaceHistoryMapper {
private static final String CRAWLER_PREFIX = "!";
protected PlaceHistoryMapper delegateHistoryMapper;
public PlaceHistoryMapperDecorator(PlaceHistoryMapper delegateHistoryMapper) {
this.delegateHistoryMapper = delegateHistoryMapper;
}
@Override
public Place getPlace(String token) {
String cleanToken = token;
if (token.startsWith(CRAWLER_PREFIX))
cleanToken = token.substring(CRAWLER_PREFIX.length());
else {
if (token.length() > 0)
System.err.println("there might be an error: can't find crawler prefix in " + token);
}
return delegateHistoryMapper.getPlace(cleanToken);
}
@Override
public String getToken(Place place) {
return CRAWLER_PREFIX + delegateHistoryMapper.getToken(place);
}
}
然后将新实例传递给PlaceHistoryHandler,就是它
PlaceHistoryMapperDecorator historyMapperDecorator = new PlaceHistoryMapperDecorator((PlaceHistoryMapper) GWT.create(AppPlaceHistoryMapper.class));
PlaceHistoryHandler historyHandler = new PlaceHistoryHandler(historyMapperDecorator);
我在发布此消息之前对其进行了测试,它运行正常: - )