org.apache.axiom.om.OMNode Maven / Gradle / Ivy
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* 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.stream.XMLStreamConstants;
/**
* Defines the base interface used by most of the XML object model within Axis.
*
* This tree model for XML captures the idea of deferring the construction of child nodes until they
* are needed. The isComplete function identifies whether or not a particular node has
* been fully parsed. A node may not be fully parsed, for example, if all of the children of an
* element have not yet been parsed.
*
* In comparison to DOM, in this model, you will not find document fragments, or entities. In
* addition, while {@link OMDocument} and {@link OMAttribute} exist, neither is an extension of
* OMNode.
*/
public interface OMNode extends OMSerializable {
/**
* The node is an Element.
*
* @see #getType()
*/
static final short ELEMENT_NODE = 1;
/**
* The node is a Text node.
*
* @see #getType()
*/
static final short TEXT_NODE = XMLStreamConstants.CHARACTERS;
/**
* The node is a CDATASection.
*
* @see #getType()
*/
static final short CDATA_SECTION_NODE = XMLStreamConstants.CDATA;
/**
* The node is a Comment.
*
* @see #getType()
*/
static final short COMMENT_NODE = XMLStreamConstants.COMMENT;
/**
* This node is a DTD.
*
* @see #getType()
*/
static final short DTD_NODE = XMLStreamConstants.DTD;
/**
* This node is a ProcessingInstruction.
*
* @see #getType()
*/
static final short PI_NODE = XMLStreamConstants.PROCESSING_INSTRUCTION;
/**
* This node is an Entity Reference.
*
* @see #getType()
*/
static final short ENTITY_REFERENCE_NODE = XMLStreamConstants.ENTITY_REFERENCE;
/**
* This node represents white space.
*
* @see #getType()
*/
static final short SPACE_NODE = XMLStreamConstants.SPACE;
/**
* Returns the parent containing node.
*
* Returns the parent container, which may be either an {@link OMDocument} or {@link OMElement}.
*
* @return The {@link OMContainer} of the node.
*/
OMContainer getParent();
/**
* Returns the next sibling in document order.
*
* @return Returns the next sibling in document order.
*/
OMNode getNextOMSibling() throws OMException;
/**
* Removes a node (and all of its children) from its containing parent.
*
* Removes a node from its parent. Please note that this will not
* handle the namespaces. For example, if there you have used a namespace within the detaching node
* and which is defined outside the detaching node, user has to handle it manually.
*
* @return The detached node. This is always the instance on which this method is invoked.
*/
// TODO: LLOM's OMNodeImpl triggers an exception if the node doesn't have a parent. This is not specified here.
OMNode detach() throws OMException;
/**
* Discards a node.
*
* Discard goes to the parser level and if the element is not completely built, then it will be
* completely skipped at the parser level.
*
* @throws OMException
*/
void discard() throws OMException;
/**
* Inserts a new sibling after the current node. The current node must have a parent for this
* operation to succeed. If the node to be inserted has a parent, then it will first be
* detached.
*
* @param sibling
* The node that will be added after the current node.
* @throws OMException
* if the current node has no parent
*/
void insertSiblingAfter(OMNode sibling) throws OMException;
/**
* Inserts a sibling just before the current node. The current node must have a parent for this
* operation to succeed. If the node to be inserted has a parent, then it will first be
* detached.
*
* @param sibling
* The node that will be added before the current node.
* @throws OMException
* if the current node has no parent
*/
void insertSiblingBefore(OMNode sibling) throws OMException;
/**
* Returns the type of node.
*
* @return Returns one of {@link #ELEMENT_NODE}, {@link #TEXT_NODE}, {@link #CDATA_SECTION_NODE},
* {@link #COMMENT_NODE}, {@link #DTD_NODE}, {@link #PI_NODE}, {@link
* #ENTITY_REFERENCE_NODE} or {@link #SPACE_NODE}.
*/
int getType();
/**
* Gets the previous sibling.
*
* @return Returns node.
*/
OMNode getPreviousOMSibling();
/**
* Builds itself with the OMText binary content. AXIOM supports two levels of deffered building.
* First is deffered building of AXIOM using StAX. Second level is the deffered building of
* attachments. AXIOM reads in the attachements from the stream only when user asks by calling
* getDataHandler(). build() method builds the OM without the attachments. buildAll() builds the OM
* together with attachement data. This becomes handy when user wants to free the input stream.
*/
void buildWithAttachments();
}