JCLOUDS-427: Avoiding Guava reflection code broken in Java 7u51

- Adding a version of TypeToken.where that replaces two parameters in one go
- Avoiding TypeToken type parameter replacement with wildcard bounds

Works around https://code.google.com/p/guava-libraries/issues/detail?id=1635

core/src/main/java/org/jclouds/internal/BaseView.java

@@ -70,11 +70,18 @@ public abstract class BaseView extends ForwardingObject implements View {
    public <A extends Closeable> A unwrapApi(Class<A> apiClass) {
       checkArgument(ApiContext.class.isAssignableFrom(backendType.getRawType()),
             "backend type: %s should be an ApiContext", backendType);
-      TypeToken<ApiContext<? extends A>> contextToken = new TypeToken<ApiContext<? extends A>>(delegate().getClass()) {
+      /*
+       * Revert back to ApiContext<? extends A>...where(A, apiClass) as soon as
+       * https://code.google.com/p/guava-libraries/issues/detail?id=1635
+       * is resolved.
+       */
+      TypeToken<ApiContext<? extends Closeable>> contextToken = new TypeToken<ApiContext<? extends Closeable>>() {
          private static final long serialVersionUID = 1L;
-      }.where(new TypeParameter<A>() {
+      };
-      }, TypeToken.of(apiClass));
+      Closeable api = unwrap(contextToken).getApi();
-      return unwrap(contextToken).getApi();
+      checkArgument(apiClass.isAssignableFrom(api.getClass()),
+            "API type: %s not assignable to %s", api.getClass(), apiClass);
+      return apiClass.cast(api);
    }
 
    @Override

core/src/main/java/org/jclouds/rest/config/BinderUtils.java

@@ -21,6 +21,9 @@ import com.google.common.reflect.TypeToken;
 import com.google.inject.Binder;
 import com.google.inject.TypeLiteral;
 
+import org.jclouds.util.TypeToken2;
+import org.jclouds.util.TypeToken2.TypeParameter2;
+
 /**
  * 
  * @author Adrian Cole
@@ -99,9 +102,9 @@ public class BinderUtils {
    @Deprecated
    @SuppressWarnings({ "unchecked", "serial" })
    private static <S, A> void bindHttpApiProvider(Binder binder, Class<S> sync, Class<A> async) {
-      TypeToken<SyncToAsyncHttpApiProvider<S, A>> token = new TypeToken<SyncToAsyncHttpApiProvider<S, A>>() {
+      TypeToken<SyncToAsyncHttpApiProvider<S, A>> token = new TypeToken2<SyncToAsyncHttpApiProvider<S, A>>() {
-      }.where(new TypeParameter<S>() {
+      }.where(new TypeParameter2<S>() {
-      }, sync).where(new TypeParameter<A>() {
+      }, sync, new TypeParameter2<A>() {
       }, async);
       binder.bind(sync).toProvider(TypeLiteral.class.cast(TypeLiteral.get(token.getType())));
    }
@@ -139,9 +142,9 @@ public class BinderUtils {
    @Deprecated
    @SuppressWarnings({ "unchecked", "serial" })
    private static <S, A> void bindCallGetOnFutures(Binder binder, Class<S> sync, Class<A> async) {
-      TypeToken<CallGetOnFuturesProvider<S, A>> token = new TypeToken<CallGetOnFuturesProvider<S, A>>() {
+      TypeToken<CallGetOnFuturesProvider<S, A>> token = new TypeToken2<CallGetOnFuturesProvider<S, A>>() {
-      }.where(new TypeParameter<S>() {
+      }.where(new TypeParameter2<S>() {
-      }, sync).where(new TypeParameter<A>() {
+      }, sync, new TypeParameter2<A>() {
       }, async);
       binder.bind(sync).toProvider(TypeLiteral.class.cast(TypeLiteral.get(token.getType())));
    }

core/src/main/java/org/jclouds/rest/internal/BaseRestApiMetadata.java

@@ -24,10 +24,11 @@ import java.util.Properties;
 import org.jclouds.apis.ApiMetadata;
 import org.jclouds.apis.internal.BaseApiMetadata;
 import org.jclouds.rest.RestApiMetadata;
+import org.jclouds.util.TypeToken2;
+import org.jclouds.util.TypeToken2.TypeParameter2;
 
 import com.google.common.annotations.Beta;
 import com.google.common.base.Objects.ToStringHelper;
-import com.google.common.reflect.TypeParameter;
 import com.google.common.reflect.TypeToken;
 
 /**
@@ -56,10 +57,10 @@ public abstract class BaseRestApiMetadata extends BaseApiMetadata implements Res
    }
    
    public static <S, A> TypeToken<org.jclouds.rest.RestContext<S, A>> contextToken(TypeToken<S> apiToken, TypeToken<A> asyncApiToken) {
-      return new TypeToken<org.jclouds.rest.RestContext<S, A>>() {
+      return new TypeToken2<org.jclouds.rest.RestContext<S, A>>() {
          private static final long serialVersionUID = 1L;
-      }.where(new TypeParameter<S>() {
+      }.where(new TypeParameter2<S>() {
-      }, apiToken).where(new TypeParameter<A>() {
+      }, apiToken, new TypeParameter2<A>() {
       }, asyncApiToken);
    }
    

core/src/main/java/org/jclouds/util/TypeToken2.java

@@ -0,0 +1,78 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.jclouds.util;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+import java.lang.reflect.TypeVariable;
+import java.util.Map;
+
+import org.jclouds.reflect.Reflection2;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.common.reflect.Invokable;
+import com.google.common.reflect.TypeParameter;
+import com.google.common.reflect.TypeResolver;
+import com.google.common.reflect.TypeToken;
+
+/*
+ * FIXME: remove this class ASAP!
+ *
+ * Evil stuff, adapted from https://code.google.com/p/guava-libraries/source/browse/guava/src/com/google/common/reflect/TypeToken.java#236.
+ * See https://issues.apache.org/jira/browse/JCLOUDS-427 and
+ * https://code.google.com/p/guava-libraries/issues/detail?id=1635
+ */
+public class TypeToken2<T> extends TypeToken<T> {
+   private static final long serialVersionUID = 1L;
+
+   @SuppressWarnings("unchecked")
+   public <X, Y> TypeToken<T> where(TypeParameter2<X> typeParam1,
+         TypeToken<X> typeArg1, TypeParameter2<Y> typeParam2, TypeToken<Y> typeArg2) {
+      // resolving both parameters in one shot seems to work around 1635
+      TypeResolver resolver = new TypeResolver();
+      // where(Map) is package-private in TypeResolver
+      Invokable<TypeResolver, TypeResolver> whereWithMap =
+            Reflection2.<TypeResolver, TypeResolver>method(TypeResolver.class, "where",
+                  Map.class);
+      try {
+         resolver = whereWithMap.invoke(resolver, ImmutableMap.of(
+               typeParam1.getTypeVariable(), typeArg1.getType(),
+               typeParam2.getTypeVariable(), typeArg2.getType()));
+      } catch (IllegalAccessException exception) {
+         // should never happen
+         throw new IllegalStateException(exception);
+      } catch (InvocationTargetException exception) {
+         // should never happen
+         throw new IllegalStateException(exception);
+      }
+      return (TypeToken<T>) TypeToken.of(resolver.resolveType(getType()));
+   }
+
+   public <X, Y> TypeToken<T> where(TypeParameter2<X> typeParam1, Class<X> typeArg1,
+         TypeParameter2<Y> typeParam2, Class<Y> typeArg2) {
+      return where(typeParam1, of(typeArg1), typeParam2, of(typeArg2));
+   }
+
+   public static abstract class TypeParameter2<T> extends TypeParameter<T> {
+      TypeVariable<?> getTypeVariable() {
+         // duplicated from TypeCapture, where it's package-private
+         Type superclass = getClass().getGenericSuperclass();
+         return (TypeVariable<?>) ((ParameterizedType) superclass).getActualTypeArguments()[0];
+      }
+   }
+}