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Simple is a high performance XML serialization and configuration framework for Java
/*
* OutputDocument.java July 2006
*
* Copyright (C) 2006, Niall Gallagher
*
* 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.simpleframework.xml.stream;
/**
* The OutputDocument object is used to represent the
* root of an XML document. This does not actually represent anything
* that will be written to the generated document. It is used as a
* way to create the root document element. Once the root element has
* been created it can be committed by using this object.
*
* @author Niall Gallagher
*/
class OutputDocument implements OutputNode {
/**
* Represents a dummy output node map for the attributes.
*/
private OutputNodeMap table;
/**
* Represents the writer that is used to create the element.
*/
private NodeWriter writer;
/**
* This is the output stack used by the node writer object.
*/
private OutputStack stack;
/**
* This represents the namespace reference used by this.
*/
private String reference;
/**
* This is the comment that is to be written for the node.
*/
private String comment;
/**
* Represents the value that has been set on this document.
*/
private String value;
/**
* This is the name of this output document node instance.
*/
private String name;
/**
* This is the output mode of this output document object.
*/
private Mode mode;
/**
* Constructor for the OutputDocument object. This
* is used to create an empty output node object that can be
* used to create a root element for the generated document.
*
* @param writer this is the node writer to write the node to
* @param stack this is the stack that contains the open nodes
*/
public OutputDocument(NodeWriter writer, OutputStack stack) {
this.table = new OutputNodeMap(this);
this.mode = Mode.INHERIT;
this.writer = writer;
this.stack = stack;
}
/**
* The default for the OutputDocument is null as it
* does not require a namespace. A null prefix is always used by
* the document as it represents a virtual node that does not
* exist and will not form any part of the resulting XML.
*
* @return this returns a null prefix for the output document
*/
public String getPrefix() {
return null;
}
/**
* The default for the OutputDocument is null as it
* does not require a namespace. A null prefix is always used by
* the document as it represents a virtual node that does not
* exist and will not form any part of the resulting XML.
*
* @param inherit if there is no explicit prefix then inherit
*
* @return this returns a null prefix for the output document
*/
public String getPrefix(boolean inherit) {
return null;
}
/**
* This is used to acquire the reference that has been set on
* this output node. Typically this should be null as this node
* does not represent anything that actually exists. However
* if a namespace reference is set it can be acquired.
*
* @return this returns the namespace reference for this node
*/
public String getReference() {
return reference;
}
/**
* This is used to set the namespace reference for the document.
* Setting a reference for the document node has no real effect
* as the document node is virtual and is not written to the
* resulting XML document that is generated.
*
* @param reference this is the namespace reference added
*/
public void setReference(String reference) {
this.reference = reference;
}
/**
* This returns the NamespaceMap for the document.
* The namespace map for the document must be null as this will
* signify the end of the resolution process for a prefix if
* given a namespace reference.
*
* @return this will return a null namespace map object
*/
public NamespaceMap getNamespaces() {
return null;
}
/**
* This is used to acquire the Node that is the
* parent of this node. This will return the node that is
* the direct parent of this node and allows for siblings to
* make use of nodes with their parents if required.
*
* @return this will always return null for this output
*/
public OutputNode getParent() {
return null;
}
/**
* To signify that this is the document element this method will
* return null. Any object with a handle on an output node that
* has been created can check the name to determine its type.
*
* @return this returns null for the name of the node
*/
public String getName() {
return null;
}
/**
* This returns the value that has been set for this document.
* The value returned is essentially a dummy value as this node
* is never written to the resulting XML document.
*
* @return the value that has been set with this document
*/
public String getValue() throws Exception {
return value;
}
/**
* This is used to get the text comment for the element. This can
* be null if no comment has been set. If no comment is set on
* the node then no comment will be written to the resulting XML.
*
* @return this is the comment associated with this element
*/
public String getComment() {
return comment;
}
/**
* This method is used to determine if this node is the root
* node for the XML document. The root node is the first node
* in the document and has no sibling nodes. This will return
* true although the document node is not strictly the root.
*
* @return returns true although this is not really a root
*/
public boolean isRoot() {
return true;
}
/**
* The Mode is used to indicate the output mode
* of this node. Three modes are possible, each determines
* how a value, if specified, is written to the resulting XML
* document. This is determined by the setData
* method which will set the output to be CDATA or escaped,
* if neither is specified the mode is inherited.
*
* @return this returns the mode of this output node object
*/
public Mode getMode() {
return mode;
}
/**
* This is used to set the output mode of this node to either
* be CDATA, escaped, or inherited. If the mode is set to data
* then any value specified will be written in a CDATA block,
* if this is set to escaped values are escaped. If however
* this method is set to inherited then the mode is inherited
* from the parent node.
*
* @param mode this is the output mode to set the node to
*/
public void setMode(Mode mode) {
this.mode = mode;
}
/**
* This method is used for convenience to add an attribute node
* to the attribute NodeMap. The attribute added
* can be removed from the element by using the node map.
*
* @param name this is the name of the attribute to be added
* @param value this is the value of the node to be added
*
* @return this returns the node that has just been added
*/
public OutputNode setAttribute(String name, String value) {
return table.put(name, value);
}
/**
* This returns a NodeMap which can be used to add
* nodes to this node. The node map returned by this is a dummy
* map, as this output node is never written to the XML document.
*
* @return returns the node map used to manipulate attributes
*/
public NodeMap getAttributes() {
return table;
}
/**
* This is used to change the name of an output node. This will
* only affect the name of the node if the node has not yet been
* committed. If the node is committed then this will not be
* reflected in the resulting XML generated.
*
* @param name this is the name to change the node to
*/
public void setName(String name) {
this.name = name;
}
/**
* This is used to set a text value to the element. This effect
* of adding this to the document node will not change what
* is actually written to the generated XML document.
*
* @param value this is the text value to add to this element
*/
public void setValue(String value) {
this.value = value;
}
/**
* This is used to set a text comment to the element. This will
* be written just before the actual element is written. Only a
* single comment can be set for each output node written.
*
* @param comment this is the comment to set on the node
*/
public void setComment(String comment) {
this.comment = comment;
}
/**
* This is used to set the output mode of this node to either
* be CDATA or escaped. If this is set to true the any value
* specified will be written in a CDATA block, if this is set
* to false the values is escaped. If however this method is
* never invoked then the mode is inherited from the parent.
*
* @param data if true the value is written as a CDATA block
*/
public void setData(boolean data) {
if(data) {
mode = Mode.DATA;
} else {
mode = Mode.ESCAPE;
}
}
/**
* This is used to create a child element within the element that
* this object represents. When a new child is created with this
* method then the previous child is committed to the document.
* The created OutputNode object can be used to add
* attributes to the child element as well as other elements.
*
* @param name this is the name of the child element to create
*/
public OutputNode getChild(String name) throws Exception {
return writer.writeElement(this, name);
}
/**
* This is used to remove any uncommitted changes. Removal of an
* output node can only be done if it has no siblings and has
* not yet been committed. If the node is committed then this
* will throw an exception to indicate that it cannot be removed.
*
* @throws Exception thrown if the node cannot be removed
*/
public void remove() throws Exception {
if(stack.isEmpty()) {
throw new NodeException("No root node");
}
stack.bottom().remove();
}
/**
* This will commit this element and any uncommitted elements
* elements that are decendents of this node. For instance if
* any child or grand child remains open under this element
* then those elements will be closed before this is closed.
*
* @throws Exception this is thrown if there is an I/O error
* or if a root element has not yet been created
*/
public void commit() throws Exception {
if(stack.isEmpty()) {
throw new NodeException("No root node");
}
stack.bottom().commit();
}
/**
* This is used to determine whether this node has been committed.
* This will return true if no root element has been created or
* if the root element for the document has already been commited.
*
* @return true if the node is committed or has not been created
*/
public boolean isCommitted() {
return stack.isEmpty();
}
}
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