Added support for exists method on PathClient

sdk/storage/azure-storage-file-datalake/CHANGELOG.md

@@ -1,5 +1,8 @@
 # Change Log azure-storage-file-datalake
 
+## Version XXXX-X-X-beta.X (XXXX-XX-XX)
+- Added support for exists method on FileClients and DirectoryClients
+
 ## Version 12.0.0-beta.7 (2019-12-04)
 This package's 
 [documentation](https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/storage/azure-storage-file-datalake/README.md) 

sdk/storage/azure-storage-file-datalake/src/main/java/com/azure/storage/file/datalake/DataLakePathAsyncClient.java

@@ -419,6 +419,41 @@ public Mono<Response<PathProperties>> getPropertiesWithResponse(DataLakeRequestC
         }
     }
 
+    /**
+     * Determines if the path this client represents exists in the cloud.
+     *
+     * <p><strong>Code Samples</strong></p>
+     *
+     * {@codesnippet com.azure.storage.file.datalake.DataLakePathAsyncClient.exists}
+     *
+     * @return true if the path exists, false if it doesn't
+     */
+    public Mono<Boolean> exists() {
+        try {
+            return existsWithResponse().flatMap(FluxUtil::toMono);
+        } catch (RuntimeException ex) {
+            return monoError(logger, ex);
+        }
+    }
+
+    /**
+     * Determines if the path this client represents exists in the cloud.
+     *
+     * <p><strong>Code Samples</strong></p>
+     *
+     * {@codesnippet com.azure.storage.file.datalake.DataLakePathAsyncClient.existsWithResponse}
+     *
+     * @return true if the path exists, false if it doesn't
+     */
+    public Mono<Response<Boolean>> existsWithResponse() {
+        try {
+            // TODO (gapra) : Once datalake error mapping is merged, add onErrorMap
+            return blockBlobAsyncClient.existsWithResponse();
+        } catch (RuntimeException ex) {
+            return monoError(logger, ex);
+        }
+    }
+
     /**
      * Changes the access control list, group and/or owner for a resource.
      *

sdk/storage/azure-storage-file-datalake/src/main/java/com/azure/storage/file/datalake/DataLakePathClient.java

@@ -405,6 +405,35 @@ public Response<PathProperties> getPropertiesWithResponse(DataLakeRequestConditi
         return new SimpleResponse<>(response, Transforms.toPathProperties(response.getValue()));
     }
 
+    /**
+     * Gets if the path this client represents exists in the cloud.
+     *
+     * <p><strong>Code Samples</strong></p>
+     *
+     * {@codesnippet com.azure.storage.file.datalake.DataLakePathClient.exists}
+     *
+     * @return true if the path exists, false if it doesn't
+     */
+    public Boolean exists() {
+        return existsWithResponse(null, Context.NONE).getValue();
+    }
+
+    /**
+     * Gets if the path this client represents exists in the cloud.
+     *
+     * <p><strong>Code Samples</strong></p>
+     *
+     * {@codesnippet com.azure.storage.file.datalake.DataLakePathClient.existsWithResponse#Duration-Context}
+     *
+     * @param timeout An optional timeout value beyond which a {@link RuntimeException} will be raised.
+     * @param context Additional context that is passed through the Http pipeline during the service call.
+     * @return true if the path exists, false if it doesn't
+     */
+    public Response<Boolean> existsWithResponse(Duration timeout, Context context) {
+        // TODO (gapra) : Once error mapping is merged add error mapping
+        return blockBlobClient.existsWithResponse(timeout, context);
+    }
+
     /**
      * Package-private rename method for use by {@link DataLakeFileClient} and {@link DataLakeDirectoryClient}
      *

sdk/storage/azure-storage-file-datalake/src/samples/java/com/azure/storage/file/datalake/PathAsyncClientJavaDocCodeSamples.java

@@ -124,6 +124,24 @@ public void getPropertiesWithResponseCodeSnippets() {
         // END: com.azure.storage.file.datalake.DataLakePathAsyncClient.getPropertiesWithResponse#DataLakeRequestConditions
     }
 
+    /**
+     * Code snippet for {@link DataLakePathAsyncClient#exists()}
+     */
+    public void existsCodeSnippet() {
+        // BEGIN: com.azure.storage.file.datalake.DataLakePathAsyncClient.exists
+        client.exists().subscribe(response -> System.out.printf("Exists? %b%n", response));
+        // END: com.azure.storage.file.datalake.DataLakePathAsyncClient.exists
+    }
+
+    /**
+     * Code snippet for {@link DataLakePathAsyncClient#existsWithResponse()}
+     */
+    public void existsWithResponseCodeSnippet() {
+        // BEGIN: com.azure.storage.file.datalake.DataLakePathAsyncClient.existsWithResponse
+        client.existsWithResponse().subscribe(response -> System.out.printf("Exists? %b%n", response.getValue()));
+        // END: com.azure.storage.file.datalake.DataLakePathAsyncClient.existsWithResponse
+    }
+
     /**
      * Code snippets for {@link DataLakePathAsyncClient#setAccessControlList(List, String, String)}
      */

sdk/storage/azure-storage-file-datalake/src/samples/java/com/azure/storage/file/datalake/PathClientJavaDocCodeSamples.java

@@ -139,6 +139,24 @@ public void getPropertiesWithResponseCodeSnippets() {
         // END: com.azure.storage.file.datalake.DataLakePathClient.getPropertiesWithResponse#DataLakeRequestConditions-Duration-Context
     }
 
+    /**
+     * Code snippets for {@link DataLakePathClient#exists()}
+     */
+    public void existsCodeSnippet() {
+        // BEGIN: com.azure.storage.file.datalake.DataLakePathClient.exists
+        System.out.printf("Exists? %b%n", client.exists());
+        // END: com.azure.storage.file.datalake.DataLakePathClient.exists
+    }
+
+    /**
+     * Code snippet for {@link DataLakePathClient#existsWithResponse(Duration, Context)}
+     */
+    public void existsWithResponseCodeSnippet() {
+        // BEGIN: com.azure.storage.file.datalake.DataLakePathClient.existsWithResponse#Duration-Context
+        System.out.printf("Exists? %b%n", client.existsWithResponse(timeout, new Context(key2, value2)).getValue());
+        // END: com.azure.storage.file.datalake.DataLakePathClient.existsWithResponse#Duration-Context
+    }
+
     /**
      * Code snippets for {@link DataLakePathClient#setAccessControlList(List, String, String)}
      */

sdk/storage/azure-storage-file-datalake/src/test/java/com/azure/storage/file/datalake/DirectoryAPITest.groovy

@@ -64,6 +64,20 @@ class DirectoryAPITest extends APISpec {
         thrown(Exception)
     }
 
+    def "Exists"() {
+        when:
+        dc = fsc.getDirectoryClient(generatePathName())
+        dc.create()
+
+        then:
+        dc.exists()
+    }
+
+    def "Does not exist"() {
+        expect:
+        !fsc.getDirectoryClient(generatePathName()).exists()
+    }
+
     @Unroll
     def "Create headers"() {
         // Create does not set md5

sdk/storage/azure-storage-file-datalake/src/test/java/com/azure/storage/file/datalake/FileAPITest.groovy

@@ -68,6 +68,20 @@ class FileAPITest extends APISpec {
         thrown(StorageErrorException)
     }
 
+    def "Exists"() {
+        when:
+        fc = fsc.getFileClient(generatePathName())
+        fc.create()
+
+        then:
+        fc.exists()
+    }
+
+    def "Does not exist"() {
+        expect:
+        !fsc.getFileClient(generatePathName()).exists()
+    }
+
     @Unroll
     def "Create headers"() {
         // Create does not set md5

sdk/storage/azure-storage-file-datalake/src/test/resources/session-records/DirectoryAPITestdoesnotexist.json

@@ -0,0 +1,105 @@
+{
+  "networkCallRecords" : [ {
+    "Method" : "PUT",
+    "Uri" : "https://gaprahns.blob.core.windows.net/jtfsdoesnotexist0directoryapitestdoesnotexistacb932268c8d6?restype=container",
+    "Headers" : {
+      "x-ms-version" : "2019-02-02",
+      "User-Agent" : "azsdk-java-azure-storage-blob/12.2.0-beta.1 (11.0.4; Windows 10 10.0)",
+      "x-ms-client-request-id" : "1529a7a4-981e-4701-82ff-d6359ec045ad"
+    },
+    "Response" : {
+      "x-ms-version" : "2019-02-02",
+      "Server" : "Windows-Azure-Blob/1.0 Microsoft-HTTPAPI/2.0",
+      "ETag" : "0x8D77E7D2CA6187F",
+      "Last-Modified" : "Wed, 11 Dec 2019 21:00:38 GMT",
+      "retry-after" : "0",
+      "Content-Length" : "0",
+      "StatusCode" : "201",
+      "x-ms-request-id" : "c14d990b-001e-007d-4566-b0d2b2000000",
+      "Date" : "Wed, 11 Dec 2019 21:00:37 GMT",
+      "x-ms-client-request-id" : "1529a7a4-981e-4701-82ff-d6359ec045ad"
+    },
+    "Exception" : null
+  }, {
+    "Method" : "PUT",
+    "Uri" : "https://gaprahns.dfs.core.windows.net/jtfsdoesnotexist0directoryapitestdoesnotexistacb932268c8d6/javapathdoesnotexist1directoryapitestdoesnotexistacb73766c26?resource=directory",
+    "Headers" : {
+      "x-ms-version" : "2019-02-02",
+      "User-Agent" : "azsdk-java-azure-storage-file-datalake/12.0.0-beta.8 (11.0.4; Windows 10 10.0)",
+      "x-ms-client-request-id" : "8c26ea54-c7b3-48fd-9417-5bf3bbdf42c0"
+    },
+    "Response" : {
+      "x-ms-version" : "2019-02-02",
+      "Server" : "Windows-Azure-HDFS/1.0 Microsoft-HTTPAPI/2.0",
+      "ETag" : "0x8D77E7D2CE5EE11",
+      "Last-Modified" : "Wed, 11 Dec 2019 21:00:38 GMT",
+      "retry-after" : "0",
+      "Content-Length" : "0",
+      "StatusCode" : "201",
+      "x-ms-request-id" : "7be34692-701f-0050-1666-b05172000000",
+      "Date" : "Wed, 11 Dec 2019 21:00:38 GMT",
+      "x-ms-client-request-id" : "8c26ea54-c7b3-48fd-9417-5bf3bbdf42c0"
+    },
+    "Exception" : null
+  }, {
+    "Method" : "HEAD",
+    "Uri" : "https://gaprahns.blob.core.windows.net/jtfsdoesnotexist0directoryapitestdoesnotexistacb932268c8d6/javapathdoesnotexist2directoryapitestdoesnotexistacb04530104",
+    "Headers" : {
+      "x-ms-version" : "2019-02-02",
+      "User-Agent" : "azsdk-java-azure-storage-blob/12.2.0-beta.1 (11.0.4; Windows 10 10.0)",
+      "x-ms-client-request-id" : "1f03d86a-429c-4a71-9b6c-ec423c143b1f"
+    },
+    "Response" : {
+      "x-ms-version" : "2019-02-02",
+      "Server" : "Windows-Azure-Blob/1.0 Microsoft-HTTPAPI/2.0",
+      "x-ms-error-code" : "BlobNotFound",
+      "retry-after" : "0",
+      "StatusCode" : "404",
+      "x-ms-request-id" : "c14d99dd-001e-007d-0166-b0d2b2000000",
+      "Date" : "Wed, 11 Dec 2019 21:00:38 GMT",
+      "x-ms-client-request-id" : "1f03d86a-429c-4a71-9b6c-ec423c143b1f"
+    },
+    "Exception" : null
+  }, {
+    "Method" : "GET",
+    "Uri" : "https://gaprahns.blob.core.windows.net?prefix=jtfsdoesnotexist&comp=list",
+    "Headers" : {
+      "x-ms-version" : "2019-02-02",
+      "User-Agent" : "azsdk-java-azure-storage-blob/12.2.0-beta.1 (11.0.4; Windows 10 10.0)",
+      "x-ms-client-request-id" : "5d9f0c9b-6ecb-42c2-a7f2-789a4ffd9cbc"
+    },
+    "Response" : {
+      "Transfer-Encoding" : "chunked",
+      "x-ms-version" : "2019-02-02",
+      "Server" : "Windows-Azure-Blob/1.0 Microsoft-HTTPAPI/2.0",
+      "retry-after" : "0",
+      "StatusCode" : "200",
+      "x-ms-request-id" : "c14d9a00-001e-007d-1b66-b0d2b2000000",
+      "Body" : "<?xml version=\"1.0\" encoding=\"utf-8\"?><EnumerationResults ServiceEndpoint=\"https://gaprahns.blob.core.windows.net/\"><Prefix>jtfsdoesnotexist</Prefix><Containers><Container><Name>jtfsdoesnotexist0directoryapitestdoesnotexistacb932268c8d6</Name><Properties><Last-Modified>Wed, 11 Dec 2019 21:00:38 GMT</Last-Modified><Etag>\"0x8D77E7D2CA6187F\"</Etag><LeaseStatus>unlocked</LeaseStatus><LeaseState>available</LeaseState><DefaultEncryptionScope>$account-encryption-key</DefaultEncryptionScope><DenyEncryptionScopeOverride>false</DenyEncryptionScopeOverride><HasImmutabilityPolicy>false</HasImmutabilityPolicy><HasLegalHold>false</HasLegalHold></Properties></Container></Containers><NextMarker /></EnumerationResults>",
+      "Date" : "Wed, 11 Dec 2019 21:00:38 GMT",
+      "x-ms-client-request-id" : "5d9f0c9b-6ecb-42c2-a7f2-789a4ffd9cbc",
+      "Content-Type" : "application/xml"
+    },
+    "Exception" : null
+  }, {
+    "Method" : "DELETE",
+    "Uri" : "https://gaprahns.blob.core.windows.net/jtfsdoesnotexist0directoryapitestdoesnotexistacb932268c8d6?restype=container",
+    "Headers" : {
+      "x-ms-version" : "2019-02-02",
+      "User-Agent" : "azsdk-java-azure-storage-blob/12.2.0-beta.1 (11.0.4; Windows 10 10.0)",
+      "x-ms-client-request-id" : "e78e49c7-4709-4341-abfa-d166bd539942"
+    },
+    "Response" : {
+      "x-ms-version" : "2019-02-02",
+      "Server" : "Windows-Azure-Blob/1.0 Microsoft-HTTPAPI/2.0",
+      "retry-after" : "0",
+      "Content-Length" : "0",
+      "StatusCode" : "202",
+      "x-ms-request-id" : "c14d9a3b-001e-007d-5466-b0d2b2000000",
+      "Date" : "Wed, 11 Dec 2019 21:00:38 GMT",
+      "x-ms-client-request-id" : "e78e49c7-4709-4341-abfa-d166bd539942"
+    },
+    "Exception" : null
+  } ],
+  "variables" : [ "jtfsdoesnotexist0directoryapitestdoesnotexistacb932268c8d6", "javapathdoesnotexist1directoryapitestdoesnotexistacb73766c26", "javapathdoesnotexist2directoryapitestdoesnotexistacb04530104" ]
+}