/*
* Copyright 2008 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.uibinder.rebind;
import com.google.gwt.core.ext.BadPropertyValueException;
import com.google.gwt.core.ext.Generator;
import com.google.gwt.core.ext.GeneratorContext;
import com.google.gwt.core.ext.PropertyOracle;
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.NotFoundException;
import com.google.gwt.core.ext.typeinfo.TypeOracle;
import com.google.gwt.dev.resource.Resource;
import com.google.gwt.dev.resource.ResourceOracle;
import com.google.gwt.dev.util.Util;
import com.google.gwt.uibinder.client.UiTemplate;
import com.google.gwt.uibinder.rebind.messages.MessagesWriter;
import com.google.gwt.uibinder.rebind.model.ImplicitClientBundle;
import org.w3c.dom.Document;
import org.xml.sax.SAXParseException;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
/**
* Generator for implementations of
* {@link com.google.gwt.uibinder.client.UiBinder}.
*/
public class UiBinderGenerator extends Generator {
private static final String BINDER_URI = "urn:ui:com.google.gwt.uibinder";
private static final String TEMPLATE_SUFFIX = ".ui.xml";
private static final String XSS_SAFE_CONFIG_PROPERTY = "UiBinder.useSafeHtmlTemplates";
private static final String LAZY_WIDGET_BUILDERS_PROPERTY = "UiBinder.useLazyWidgetBuilders";
private static boolean gaveSafeHtmlWarning;
private static boolean gaveLazyBuildersWarning;
/**
* Given a UiBinder interface, return the path to its ui.xml file, suitable
* for any classloader to find it as a resource.
*/
private static String deduceTemplateFile(MortalLogger logger,
JClassType interfaceType) throws UnableToCompleteException {
String templateName = null;
UiTemplate annotation = interfaceType.getAnnotation(UiTemplate.class);
if (annotation == null) {
// if the interface is defined as a nested class, use the name of the
// enclosing type
if (interfaceType.getEnclosingType() != null) {
interfaceType = interfaceType.getEnclosingType();
}
return slashify(interfaceType.getQualifiedBinaryName()) + TEMPLATE_SUFFIX;
} else {
templateName = annotation.value();
if (!templateName.endsWith(TEMPLATE_SUFFIX)) {
logger.die("Template file name must end with " + TEMPLATE_SUFFIX);
}
/*
* If the template file name (minus suffix) has no dots, make it relative
* to the binder's package, otherwise slashify the dots
*/
String unsuffixed = templateName.substring(0,
templateName.lastIndexOf(TEMPLATE_SUFFIX));
if (!unsuffixed.contains(".")) {
templateName = slashify(interfaceType.getPackage().getName()) + "/"
+ templateName;
} else {
templateName = slashify(unsuffixed) + TEMPLATE_SUFFIX;
}
}
return templateName;
}
private static String slashify(String s) {
return s.replace(".", "/").replace("$", ".");
}
private final UiBinderContext uiBinderCtx = new UiBinderContext();
@Override
public String generate(TreeLogger logger, GeneratorContext genCtx,
String fqInterfaceName) throws UnableToCompleteException {
TypeOracle oracle = genCtx.getTypeOracle();
ResourceOracle resourceOracle = genCtx.getResourcesOracle();
JClassType interfaceType;
try {
interfaceType = oracle.getType(fqInterfaceName);
} catch (NotFoundException e) {
throw new RuntimeException(e);
}
DesignTimeUtils designTime;
if (DesignTimeUtilsImpl.isDesignTime(fqInterfaceName)) {
designTime = new DesignTimeUtilsImpl();
} else {
designTime = DesignTimeUtilsStub.EMPTY;
}
String implName = interfaceType.getName().replace('.', '_') + "Impl";
implName = designTime.getImplName(implName);
String packageName = interfaceType.getPackage().getName();
PrintWriterManager writers = new PrintWriterManager(genCtx, logger,
packageName);
PrintWriter printWriter = writers.tryToMakePrintWriterFor(implName);
if (printWriter != null) {
generateOnce(interfaceType, implName, printWriter, logger, oracle,
resourceOracle, genCtx.getPropertyOracle(), writers, designTime);
}
return packageName + "." + implName;
}
private Boolean extractConfigProperty(MortalLogger logger,
PropertyOracle propertyOracle, String configProperty, boolean defaultValue) {
List<String> values;
try {
values = propertyOracle.getConfigurationProperty(configProperty).getValues();
} catch (BadPropertyValueException e) {
logger.warn("No value found for configuration property %s.", configProperty);
return defaultValue;
}
String value = values.get(0);
if (!value.equals(Boolean.FALSE.toString()) && !value.equals(Boolean.TRUE.toString())) {
logger.warn("Unparseable value \"%s\" found for configuration property %s", value,
configProperty);
return defaultValue;
}
return Boolean.valueOf(value);
}
private void generateOnce(JClassType interfaceType, String implName,
PrintWriter binderPrintWriter, TreeLogger treeLogger, TypeOracle oracle,
ResourceOracle resourceOracle, PropertyOracle propertyOracle,
PrintWriterManager writerManager, DesignTimeUtils designTime)
throws UnableToCompleteException {
MortalLogger logger = new MortalLogger(treeLogger);
String templatePath = deduceTemplateFile(logger, interfaceType);
MessagesWriter messages = new MessagesWriter(oracle, BINDER_URI, logger,
templatePath, interfaceType.getPackage().getName(), implName);
boolean useLazyWidgetBuilders =
useLazyWidgetBuilders(logger, propertyOracle) && !designTime.isDesignTime();
FieldManager fieldManager = new FieldManager(oracle, logger, useLazyWidgetBuilders);
UiBinderWriter uiBinderWriter = new UiBinderWriter(interfaceType, implName,
templatePath, oracle, logger, fieldManager, messages, designTime, uiBinderCtx,
useSafeHtmlTemplates(logger, propertyOracle), useLazyWidgetBuilders, BINDER_URI);
Document doc = getW3cDoc(logger, designTime, resourceOracle, templatePath);
designTime.rememberPathForElements(doc);
uiBinderWriter.parseDocument(doc, binderPrintWriter);
if (messages.hasMessages()) {
messages.write(writerManager.makePrintWriterFor(messages.getMessagesClassName()));
}
ImplicitClientBundle bundleClass = uiBinderWriter.getBundleClass();
new BundleWriter(bundleClass, writerManager, oracle, logger).write();
writerManager.commit();
}
private Document getW3cDoc(MortalLogger logger, DesignTimeUtils designTime,
ResourceOracle resourceOracle, String templatePath)
throws UnableToCompleteException {
Resource resource = resourceOracle.getResourceMap().get(templatePath);
if (null == resource) {
logger.die("Unable to find resource: " + templatePath);
}
Document doc = null;
try {
String content = designTime.getTemplateContent(templatePath);
if (content == null) {
content = Util.readStreamAsString(resource.openContents());
}
doc = new W3cDomHelper(logger.getTreeLogger(), resourceOracle).documentFor(
content, resource.getPath());
} catch (IOException iex) {
logger.die("Error opening resource:" + resource.getLocation(), iex);
} catch (SAXParseException e) {
logger.die(
"Error parsing XML (line " + e.getLineNumber() + "): "
+ e.getMessage(), e);
}
return doc;
}
private Boolean useLazyWidgetBuilders(MortalLogger logger, PropertyOracle propertyOracle) {
Boolean rtn = extractConfigProperty(logger, propertyOracle, LAZY_WIDGET_BUILDERS_PROPERTY, true);
if (!gaveLazyBuildersWarning && !rtn) {
logger.warn("Configuration property %s is false. Deprecated code generation is in play. " +
"This property will soon become a no-op.",
LAZY_WIDGET_BUILDERS_PROPERTY);
gaveLazyBuildersWarning = true;
}
return rtn;
}
private Boolean useSafeHtmlTemplates(MortalLogger logger, PropertyOracle propertyOracle) {
Boolean rtn = extractConfigProperty(
logger, propertyOracle, XSS_SAFE_CONFIG_PROPERTY, true);
if (!gaveSafeHtmlWarning && !rtn) {
logger.warn("Configuration property %s is false! UiBinder SafeHtml integration is off, "
+ "leaving your users more vulnerable to cross-site scripting attacks. This property " +
"will soon become a no-op, and SafeHtml integration will always be on.",
XSS_SAFE_CONFIG_PROPERTY);
gaveSafeHtmlWarning = true;
}
return rtn;
}
}