/*
* 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.inject.rebind.binding;
import com.google.gwt.inject.rebind.reflect.NoSourceNameException;
import com.google.gwt.inject.rebind.reflect.ReflectUtil;
import com.google.gwt.inject.rebind.util.GuiceUtil;
import com.google.gwt.inject.rebind.util.InjectorMethod;
import com.google.gwt.inject.rebind.util.NameGenerator;
import com.google.gwt.inject.rebind.util.SourceSnippet;
import com.google.gwt.inject.rebind.util.SourceSnippetBuilder;
import com.google.inject.TypeLiteral;
import java.util.List;
/**
* A binding that just calls {@code GWT.create()} for the requested type.
* This is the default binding for interfaces or classes that don't have
* a non-default constructor annotated with {@code @Inject}.
*/
public class CallGwtDotCreateBinding extends CreatorBinding {
CallGwtDotCreateBinding(GuiceUtil guiceUtil, TypeLiteral<?> type, Context context) {
super(guiceUtil, type, context);
}
@Override protected final SourceSnippet getCreationStatement(NameGenerator nameGenerator,
List<InjectorMethod> methodsOutput) throws NoSourceNameException {
return new SourceSnippetBuilder()
.append("Object created = GWT.create(").append(getTypeNameToCreate()).append(".class);\n")
// Gin cannot deal with cases where the type returned by GWT.create is
// not equal or a subtype of the requested type. Assert this here, in
// production code (without asserts) the line below the assert will
// throw a ClassCastException instead.
.append("assert created instanceof ").append(getExpectedTypeName()).append(";\n")
.append(getTypeName()).append(" result = (").append(getTypeName()).append(") created;\n")
.build();
}
protected String getTypeNameToCreate() throws NoSourceNameException {
// Using a raw type because GWT.create and instanceof cannot take
// parameterized arguments.
return ReflectUtil.getSourceName(getType().getRawType());
}
protected String getExpectedTypeName() throws NoSourceNameException {
return getTypeNameToCreate();
}
}