| /* |
| * 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.apache.axiom.ext.stax; |
| |
| import java.io.IOException; |
| |
| import javax.xml.stream.XMLStreamException; |
| |
| import org.apache.axiom.blob.Blob; |
| |
| /** |
| * Extension interface for {@link javax.xml.stream.XMLStreamWriter} implementations that can |
| * receive base64 encoded binary content as {@link Blob} objects. A stream writer |
| * implementing this extension may write the binary data as base64 encoded character data |
| * or using some optimization such as XOP/MTOM. |
| * <p> |
| * All the requirements specified in {@link org.apache.axiom.ext.stax} apply to |
| * this extension interface. In particular, |
| * a consumer MUST use {@link javax.xml.stream.XMLStreamWriter#getProperty(String)} with the property |
| * name defined by {@link #PROPERTY} to get a reference to this extension interface. |
| * <p> |
| * The interface defines two methods to write binary content, one that takes a {@link Blob} |
| * argument and one with a {@link BlobProvider} argument. The first should be used when |
| * the content is immediately available, while the second supports deferred loading of the data |
| * handler. The meaning of the <code>contentID</code> and <code>optimize</code> arguments is |
| * the same for both methods: |
| * <dl> |
| * <dt><code>contentID</code> |
| * <dd> |
| * A content ID of the binary content, if available. The semantics of this argument are |
| * similar to those defined for the return value of the |
| * {@link BlobReader#getContentID()} method: |
| * <ul> |
| * <li>This argument should only be set if a content ID has been used |
| * previously in an interaction with another component or system. |
| * The caller SHOULD NOT generate a new content ID solely for the |
| * purpose of invoking the extension. |
| * <li>The argument must be a raw content ID. |
| * <li>The implementation MUST NOT make any assumption about the uniqueness or validity |
| * of the content ID. It MAY ignore the supplied value. |
| * </ul> |
| * <dt><code>optimize</code> |
| * <dd> |
| * Specifies if binary content is eligible for optimization (e.g. using XOP) or if it should |
| * be serialized as base64. This is only an indication and the implementation MAY choose |
| * to override this value or ignore it entirely. |
| * </dl> |
| * Instead of interacting directly with this extension interface, the consumer may use the |
| * {@link org.apache.axiom.util.stax.XMLStreamWriterUtils#writeBlob(javax.xml.stream.XMLStreamWriter, Blob, String, boolean)} or |
| * {@link org.apache.axiom.util.stax.XMLStreamWriterUtils#writeBlob(javax.xml.stream.XMLStreamWriter, BlobProvider, String, boolean)} |
| * utility methods. These methods make the processing of binary data entirely transparent for |
| * the caller. |
| */ |
| public interface BlobWriter { |
| /** |
| * The name of the property used to look up this extension interface from a |
| * {@link javax.xml.stream.XMLStreamWriter} implementation. |
| */ |
| String PROPERTY = BlobWriter.class.getName(); |
| |
| /** |
| * Write binary content to the stream. The implementation may choose to write the data as base64 |
| * encoded character data or using an optimization protocol such as XOP/MTOM. |
| * |
| * @param blob |
| * the binary content to write |
| * @param contentID |
| * an existing content ID for the binary data (see above) |
| * @param optimize |
| * indicates whether the content is eligible for optimization (see above) |
| * @throws IOException |
| * if an error occurs while reading from the data handler |
| * @throws XMLStreamException |
| * if an error occurs while writing to the underlying stream |
| */ |
| void writeBlob(Blob blob, String contentID, boolean optimize) |
| throws IOException, XMLStreamException; |
| |
| /** |
| * Write binary content to the stream. This method allows the implementation to defer loading of |
| * the content. More precisely, if the implementation decides to use an optimization scheme such |
| * as XOP, then the content will not be written immediately to the underlying stream, but only |
| * after the XML infoset is complete. If the caller uses this method, the implementation can |
| * defer the actual loading of the binary content. |
| * |
| * @param blobProvider |
| * the binary content to write |
| * @param contentID |
| * an existing content ID for the binary data (see above) |
| * @param optimize |
| * indicates whether the content is eligible for optimization (see above) |
| * @throws IOException |
| * If an error occurs while reading from the data handler. Since the implementation |
| * is free to override the supplied <code>optimize</code> argument, it may attempt |
| * to load the binary data immediately. Because this operation may fail, the method |
| * must declare this exception. |
| * @throws XMLStreamException |
| * if an error occurs while writing to the underlying stream |
| */ |
| void writeBlob(BlobProvider blobProvider, String contentID, |
| boolean optimize) throws IOException, XMLStreamException; |
| } |