Walrus doesn't seem to support HEAD bucket

apis/walrus/src/main/java/org/jclouds/walrus/WalrusAsyncClient.java

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+/**
+ *
+ * Copyright (C) 2010 Cloud Conscious, LLC. <info@cloudconscious.com>
+ *
+ * ====================================================================
+ * 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 org.jclouds.walrus;
+
+import static org.jclouds.blobstore.attr.BlobScopes.CONTAINER;
+
+import javax.ws.rs.GET;
+import javax.ws.rs.Path;
+
+import org.jclouds.blobstore.attr.BlobScope;
+import org.jclouds.blobstore.functions.ReturnFalseOnContainerNotFound;
+import org.jclouds.rest.annotations.BinderParam;
+import org.jclouds.rest.annotations.ExceptionParser;
+import org.jclouds.rest.annotations.ParamValidators;
+import org.jclouds.rest.annotations.QueryParams;
+import org.jclouds.rest.annotations.RequestFilters;
+import org.jclouds.rest.annotations.SkipEncoding;
+import org.jclouds.s3.Bucket;
+import org.jclouds.s3.S3AsyncClient;
+import org.jclouds.s3.S3Client;
+import org.jclouds.s3.binders.BindAsHostPrefixIfConfigured;
+import org.jclouds.s3.filters.RequestAuthorizeSignature;
+import org.jclouds.s3.predicates.validators.BucketNameValidator;
+
+import com.google.common.util.concurrent.ListenableFuture;
+
+/**
+ * 
+ * @author Adrian Cole
+ */
+@SkipEncoding('/')
+@RequestFilters(RequestAuthorizeSignature.class)
+@BlobScope(CONTAINER)
+public interface WalrusAsyncClient extends S3AsyncClient {
+
+   /**
+    * @see S3Client#bucketExists
+    */
+   @Override
+   @GET
+   @Path("/")
+   @QueryParams(keys = "max-keys", values = "0")
+   @ExceptionParser(ReturnFalseOnContainerNotFound.class)
+   ListenableFuture<Boolean> bucketExists(
+            @Bucket @BinderParam(BindAsHostPrefixIfConfigured.class) @ParamValidators( { BucketNameValidator.class }) String bucketName);
+
+}

apis/walrus/src/main/java/org/jclouds/walrus/WalrusContextBuilder.java

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+/**
+ *
+ * Copyright (C) 2010 Cloud Conscious, LLC. <info@cloudconscious.com>
+ *
+ * ====================================================================
+ * 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 org.jclouds.walrus;
+
+import java.util.List;
+import java.util.Properties;
+
+import org.jclouds.s3.S3ContextBuilder;
+import org.jclouds.walrus.config.WalrusRestClientModule;
+
+import com.google.inject.Module;
+
+/**
+ * 
+ * 
+ * @author Adrian Cole
+ */
+public class WalrusContextBuilder extends S3ContextBuilder {
+
+   public WalrusContextBuilder(Properties props) {
+      super(props);
+   }
+
+   @Override
+   protected void addClientModule(List<Module> modules) {
+      modules.add(new WalrusRestClientModule());
+   }
+}

apis/walrus/src/main/java/org/jclouds/walrus/config/WalrusRestClientModule.java

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+/**
+ *
+ * Copyright (C) 2010 Cloud Conscious, LLC. <info@cloudconscious.com>
+ *
+ * ====================================================================
+ * 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 org.jclouds.walrus.config;
+
+import org.jclouds.http.RequiresHttp;
+import org.jclouds.rest.ConfiguresRestClient;
+import org.jclouds.s3.S3Client;
+import org.jclouds.s3.config.S3RestClientModule;
+import org.jclouds.walrus.WalrusAsyncClient;
+
+/**
+ * 
+ * @author Adrian Cole
+ */
+@ConfiguresRestClient
+@RequiresHttp
+public class WalrusRestClientModule extends S3RestClientModule<S3Client, WalrusAsyncClient> {
+
+   public WalrusRestClientModule() {
+      super(S3Client.class, WalrusAsyncClient.class);
+   }
+
+}