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com.google.gwt.resources.rg.ExternalTextResourceGenerator Maven / Gradle / Ivy
/*
* 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.resources.rg;
import com.google.gwt.core.ext.BadPropertyValueException;
import com.google.gwt.core.ext.ConfigurationProperty;
import com.google.gwt.core.ext.Generator;
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.core.ext.typeinfo.JType;
import com.google.gwt.core.ext.typeinfo.TypeOracle;
import com.google.gwt.dev.util.Util;
import com.google.gwt.resources.client.TextResource;
import com.google.gwt.resources.client.impl.ExternalTextResourcePrototype;
import com.google.gwt.resources.ext.AbstractResourceGenerator;
import com.google.gwt.resources.ext.ClientBundleFields;
import com.google.gwt.resources.ext.ClientBundleRequirements;
import com.google.gwt.resources.ext.ResourceContext;
import com.google.gwt.resources.ext.ResourceGeneratorUtil;
import com.google.gwt.resources.ext.SupportsGeneratorResultCaching;
import com.google.gwt.safehtml.shared.UriUtils;
import com.google.gwt.user.rebind.SourceWriter;
import com.google.gwt.user.rebind.StringSourceWriter;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
/**
* Adds {@link ExternalTextResourcePrototype} objects to the bundle.
*/
public final class ExternalTextResourceGenerator extends
AbstractResourceGenerator implements SupportsGeneratorResultCaching {
/**
* The name of a deferred binding property that determines whether or not this
* generator will use JSONP to fetch the files.
*/
static final String USE_JSONP = "ExternalTextResource.useJsonp";
// This string must stay in sync with the values in JsonpRequest.java
static final String JSONP_CALLBACK_PREFIX = "__gwt_jsonp__.P";
private StringBuffer data;
private boolean first;
private String urlExpression;
private Map hashes;
private Map offsets;
private int currentIndex;
private String externalTextUrlIdent;
private String externalTextCacheIdent;
@Override
public String createAssignment(TreeLogger logger, ResourceContext context,
JMethod method) throws UnableToCompleteException {
String name = method.getName();
SourceWriter sw = new StringSourceWriter();
sw.println("new " + ExternalTextResourcePrototype.class.getName() + "(");
sw.indent();
sw.println('"' + name + "\",");
// These are field names
sw.println(UriUtils.class.getName() + ".fromTrustedString(" + externalTextUrlIdent + "),");
sw.println(externalTextCacheIdent + ", ");
sw.println(offsets.get(method.getName()).toString());
if (shouldUseJsonp(context, logger)) {
sw.println(", \"" + getMd5HashOfData() + "\"");
}
sw.outdent();
sw.print(")");
return sw.toString();
}
@Override
public void createFields(TreeLogger logger, ResourceContext context,
ClientBundleFields fields) throws UnableToCompleteException {
data.append(']');
StringBuffer wrappedData = new StringBuffer();
if (shouldUseJsonp(context, logger)) {
wrappedData.append(JSONP_CALLBACK_PREFIX);
wrappedData.append(getMd5HashOfData());
wrappedData.append(".onSuccess(\n");
wrappedData.append(data.toString());
wrappedData.append(")");
} else {
wrappedData = data;
}
urlExpression = context.deploy(
context.getClientBundleType().getQualifiedSourceName().replace('.', '_')
+ "_jsonbundle.txt", "text/plain", wrappedData.toString().getBytes(), true);
TypeOracle typeOracle = context.getGeneratorContext().getTypeOracle();
JClassType stringType = typeOracle.findType(String.class.getName());
assert stringType != null;
externalTextUrlIdent = fields.define(stringType, "externalTextUrl",
urlExpression, true, true);
JClassType textResourceType = typeOracle.findType(TextResource.class.getName());
assert textResourceType != null;
JType textResourceArrayType = typeOracle.getArrayType(textResourceType);
externalTextCacheIdent = fields.define(textResourceArrayType,
"externalTextCache", "new " + TextResource.class.getName() + "["
+ currentIndex + "]", true, true);
}
@Override
public void init(TreeLogger logger, ResourceContext context)
throws UnableToCompleteException {
data = new StringBuffer("[\n");
first = true;
urlExpression = null;
hashes = new HashMap();
offsets = new HashMap();
currentIndex = 0;
}
@Override
public void prepare(TreeLogger logger, ResourceContext context,
ClientBundleRequirements requirements, JMethod method)
throws UnableToCompleteException {
URL[] urls = ResourceGeneratorUtil.findResources(logger, context, method);
if (urls.length != 1) {
logger.log(TreeLogger.ERROR, "Exactly one resource must be specified",
null);
throw new UnableToCompleteException();
}
URL resource = urls[0];
String toWrite = Util.readURLAsString(resource);
// This de-duplicates strings in the bundle.
if (!hashes.containsKey(toWrite)) {
hashes.put(toWrite, currentIndex++);
if (!first) {
data.append(",\n");
} else {
first = false;
}
data.append('"');
data.append(Generator.escape(toWrite));
data.append('"');
}
// Store the (possibly n:1) mapping of resource function to bundle index.
offsets.put(method.getName(), hashes.get(toWrite));
}
private String getMd5HashOfData() {
return Util.computeStrongName(data.toString().getBytes());
}
private boolean shouldUseJsonp(ResourceContext context, TreeLogger logger) {
String useJsonpProp = null;
try {
ConfigurationProperty prop = context.getGeneratorContext()
.getPropertyOracle().getConfigurationProperty(USE_JSONP);
useJsonpProp = prop.getValues().get(0);
// add this configuration property to our requirements
context.getRequirements().addConfigurationProperty(USE_JSONP);
} catch (BadPropertyValueException e) {
logger.log(TreeLogger.ERROR, "Bad value for " + USE_JSONP, e);
return false;
}
return Boolean.parseBoolean(useJsonpProp);
}
}