| /* |
| * 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.om; |
| |
| import javax.xml.namespace.QName; |
| import javax.xml.stream.XMLStreamReader; |
| |
| /** |
| * Optional interface implemented by {@link OMDataSource} implementations that have knowledge about |
| * the local name, namespace URI and/or namespace prefix of the element they represent. This |
| * interface is used by {@link OMSourcedElement} to lazily determine the name of the element without |
| * expanding it. The information returned by the implementation may be partial; e.g. the data source |
| * may know about the local name and namespace URI but it may be unable to predict the namespace |
| * prefix. The returned information must be accurate, i.e. it must match the name of the root |
| * element in the document returned by {@link OMDataSource#getReader()}. |
| * <p> |
| * This interface should be implemented by {@link OMDataSource} implementations that have an |
| * efficient way to determine the root element name (or part of it) from the information effectively |
| * used by {@link OMDataSource#getReader()} to construct the {@link XMLStreamReader} instance. In |
| * practice this applies to {@link OMDataSource} implementations that satisfy one of the following |
| * conditions: |
| * <ul> |
| * <li>The data source wraps another type of object and is able to determine the element name from |
| * that object in an efficient way. E.g. this is often the case if the data source uses a |
| * Java-to-XML mapping framework to transform the wrapped object into XML. |
| * <li>The QName of the element is configurable and supplied by the application code when the data |
| * source is instantiated. |
| * </ul> |
| * This interface should not be implemented if the returned information would be supplied by the |
| * application code when the data source is instantiate, without the data source being able to |
| * guarantee that the information is accurate (i.e. without {@link OMDataSource#getReader()} |
| * actually using that information). In fact, in this case the application code should use |
| * {@link OMFactory#createOMElement(OMDataSource, String, OMNamespace)} or |
| * {@link OMFactory#createOMElement(OMDataSource, QName)} to supply the QName information it has. |
| */ |
| public interface QNameAwareOMDataSource extends OMDataSource { |
| /** |
| * Get the local name of the element represented by this data source. |
| * |
| * @return the local name of the element or <code>null</code> if the local name is not known |
| */ |
| String getLocalName(); |
| |
| /** |
| * Get the namespace URI of the element represented by this data source. |
| * |
| * @return the namespace URI of the element, the empty string if the element has no namespace or |
| * <code>null</code> if the namespace URI is not known |
| */ |
| String getNamespaceURI(); |
| |
| /** |
| * Get the namespace prefix of the element represented by this data source. |
| * |
| * @return the prefix of the element, the empty string if the element has no prefix or |
| * <code>null</code> if the prefix is not known; the implementation is expected to |
| * return an empty string if {@link #getNamespaceURI()} returns an empty string (because |
| * an element without namespace must not have a prefix) |
| */ |
| String getPrefix(); |
| } |