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/*
* OutputAttribute.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 OutputAttribute object is used to represent a
* node added to the output node map. It represents a simple name
* value pair that is used as an attribute by an output element.
* This shares its namespaces with the parent element so that any
* namespaces added to the attribute are actually added to the
* parent element, which ensures correct scoping.
*
* @see org.simpleframework.xml.stream.Node
*/
class OutputAttribute implements OutputNode {
/**
* This contains the namespaces for the parent element.
*/
private NamespaceMap scope;
/**
* Represents the output node that this node requires.
*/
private OutputNode source;
/**
* Represents the namespace reference for this node.
*/
private String reference;
/**
* Represents the name of this node object instance.
*/
private String name;
/**
* Represents the value of this node object instance.
*/
private String value;
/**
* Constructor for the OutputAttribute object. This
* is used to create a simple name value pair attribute holder.
*
* @param name this is the name that is used for the node
* @param value this is the value used for the node
*/
public OutputAttribute(OutputNode source, String name, String value) {
this.scope = source.getNamespaces();
this.source = source;
this.value = value;
this.name = name;
}
/**
* Returns the value for the node that this represents. This
* is a modifiable property for the node and can be changed.
* When set this forms the value the attribute contains in
* the parent XML element, which is written in quotations.
*
* @return the name of the value for this node instance
*/
public String getValue() {
return value;
}
/**
* This is used to set a text value to the attribute. This should
* be added to the attribute if the attribute is to be written
* to the parent element. Without a value this is invalid.
*
* @param value this is the text value to add to this attribute
*/
public void setValue(String value) {
this.value = value;
}
/**
* 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;
}
/**
* Returns the name of the node that this represents. This is
* an immutable property and should not change for any node.
* If this is null then the attribute will not be added to
* the node map, all attributes must have a valid key.
*
* @return returns the name of the node that this represents
*/
public String getName() {
return name;
}
/**
* 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 returns the parent node for this node
*/
public OutputNode getParent() {
return source;
}
/**
* This returns a NodeMap which can be used to add
* nodes to the element before that element has been committed.
* Nodes can be removed or added to the map and will appear as
* attributes on the written element when it is committed.
*
* @return returns the node map used to manipulate attributes
*/
public NodeMap getAttributes() {
return new OutputNodeMap(this);
}
/**
* 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) {
return null;
}
/**
* 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 null;
}
/**
* 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) {
return;
}
/**
* 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.INHERIT;
}
/**
* 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) {
return;
}
/**
* 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) {
return;
}
/**
* This is used to acquire the prefix for this output node. If
* the output node is an element then this will search its parent
* nodes until the prefix that is currently in scope is found.
* If however this node is an attribute then the hierarchy of
* nodes is not searched as attributes to not inherit namespaces.
*
* @return this returns the prefix associated with this node
*/
public String getPrefix() {
return scope.getPrefix(reference);
}
/**
* This is used to acquire the prefix for this output node. If
* the output node is an element then this will search its parent
* nodes until the prefix that is currently in scope is found.
* If however this node is an attribute then the hierarchy of
* nodes is not searched as attributes to not inherit namespaces.
*
* @param inherit if there is no explicit prefix then inherit
*
* @return this returns the prefix associated with this node
*/
public String getPrefix(boolean inherit) {
return scope.getPrefix(reference);
}
/**
* This is used to acquire the namespace URI reference associated
* with this node. Although it is recommended that the namespace
* reference is a URI it does not have to be, it can be any unique
* identifier that can be used to distinguish the qualified names.
*
* @return this returns the namespace URI reference for this
*/
public String getReference() {
return reference;
}
/**
* This is used to set the reference for the node. Setting the
* reference implies that the node is a qualified node within the
* XML document. Both elements and attributes can be qualified.
* Depending on the prefix set on this node or, failing that, any
* parent node for the reference, the element will appear in the
* XML document with that string prefixed to the node name.
*
* @param reference this is used to set the reference for the node
*/
public void setReference(String reference) {
this.reference = reference;
}
/**
* This returns the NamespaceMap for this node. Only
* an element can have namespaces, so if this node represents an
* attribute the elements namespaces will be provided when this is
* requested. By adding a namespace it becomes in scope for the
* current element all all child elements of that element.
*
* @return this returns the namespaces associated with the node
*/
public NamespaceMap getNamespaces() {
return scope;
}
/**
* This method is used for convinience to add an attribute node
* to the attribute NodeMap. The attribute added
* can be removed from the element by useing 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 null;
}
/**
* 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.
*/
public void remove() {
return;
}
/**
* The commit method is used flush and commit any
* child nodes that have been created by this node. This allows
* the output to be completed when building of the XML document
* has been completed. If output fails an exception is thrown.
*/
public void commit() {
return;
}
/**
* 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 is false
* if the node has a parent node or a sibling node.
*
* @return true if this is the root node within the document
*/
public boolean isRoot() {
return false;
}
/**
* This is used to determine whether the node has been committed.
* If the node has been committed, then this will return true.
* When committed the node can no longer produce child nodes.
*
* @return true if this node has already been committed
*/
public boolean isCommitted() {
return true;
}
/**
* This is used to acquire the name and value of the attribute.
* Implementing this method ensures that debugging the output
* node is simplified as it is possible to get the actual value.
*
* @return this returns the details of this output node
*/
public String toString() {
return String.format("attribute %s='%s'", name, value);
}
}