package com.googlecode.gwt.test.internal.patchers;
import java.lang.reflect.Constructor;
import java.lang.reflect.Type;
import javassist.CannotCompileException;
import javassist.CtClass;
import javassist.CtField;
import com.google.gwt.core.client.GWT;
import com.google.gwt.inject.rebind.adapter.GwtDotCreateProvider;
import com.google.inject.Binding;
import com.google.inject.Inject;
import com.google.inject.binder.LinkedBindingBuilder;
import com.google.inject.binder.ScopedBindingBuilder;
import com.google.inject.internal.AbstractBindingBuilder;
import com.googlecode.gwt.test.gin.GwtTestGinException;
import com.googlecode.gwt.test.patchers.InitMethod;
import com.googlecode.gwt.test.patchers.PatchClass;
import com.googlecode.gwt.test.patchers.PatchMethod;
import com.googlecode.gwt.test.utils.GwtReflectionUtils;
@SuppressWarnings("unchecked")
@PatchClass(target = "com.google.gwt.inject.rebind.adapter.GwtDotCreateProvider")
class GwtDotCreateProviderPatcher {
private static final String BINDED_CLASS_FIELD = "gwtTestUtilsBindedClass";
@PatchMethod
static <T> ScopedBindingBuilder bind(LinkedBindingBuilder<T> builder) {
if (!(builder instanceof AbstractBindingBuilder)) {
throw new GwtTestGinException("Not managed " + LinkedBindingBuilder.class.getSimpleName()
+ " implementation : " + builder.getClass().getName());
}
Binding<T> binding = GwtReflectionUtils.<Binding<T>> getPrivateFieldValue(builder, "binding");
Type type = binding.getKey().getTypeLiteral().getType();
if (!(type instanceof Class)) {
throw new GwtTestGinException("Not managed binded type : " + type);
}
Constructor<T> atInjectConstructor = getAtInjectConstructor((Class<T>) type);
if (atInjectConstructor != null) {
return builder.toConstructor(atInjectConstructor);
}
GwtDotCreateProvider<T> gwtDotCreateProvider = GwtReflectionUtils.instantiateClass(GwtDotCreateProvider.class);
GwtReflectionUtils.setPrivateFieldValue(gwtDotCreateProvider, BINDED_CLASS_FIELD, type);
return builder.toProvider(gwtDotCreateProvider);
}
@PatchMethod
static <T> T get(GwtDotCreateProvider<?> gwtDotCreateProvider) {
Class<T> bindedType = GwtReflectionUtils.<Class<T>> getPrivateFieldValue(
gwtDotCreateProvider, BINDED_CLASS_FIELD);
return GWT.<T> create(bindedType);
}
@InitMethod
static void initClass(CtClass ctClass) throws CannotCompileException {
CtField field = CtField.make("private Class " + BINDED_CLASS_FIELD + ";", ctClass);
ctClass.addField(field);
}
private static <T> Constructor<T> getAtInjectConstructor(Class<T> toInstanciate) {
for (Constructor<?> cons : toInstanciate.getDeclaredConstructors()) {
if (cons.getAnnotation(Inject.class) != null) {
return (Constructor<T>) cons;
}
}
return null;
}
}