org.jdom2.Element Maven / Gradle / Ivy
/*--
Copyright (C) 2000-2012 Jason Hunter & Brett McLaughlin.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions, and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions, and the disclaimer that follows
these conditions in the documentation and/or other materials
provided with the distribution.
3. The name "JDOM" must not be used to endorse or promote products
derived from this software without prior written permission. For
written permission, please contact .
4. Products derived from this software may not be called "JDOM", nor
may "JDOM" appear in their name, without prior written permission
from the JDOM Project Management .
In addition, we request (but do not require) that you include in the
end-user documentation provided with the redistribution and/or in the
software itself an acknowledgement equivalent to the following:
"This product includes software developed by the
JDOM Project (http://www.jdom.org/)."
Alternatively, the acknowledgment may be graphical using the logos
available at http://www.jdom.org/images/logos.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
This software consists of voluntary contributions made by many
individuals on behalf of the JDOM Project and was originally
created by Jason Hunter and
Brett McLaughlin . For more information
on the JDOM Project, please see
* See {@link NamespaceAware} and {@link #getNamespacesInScope()} for more
* details on what the Namespace scope is and how it is managed in JDOM and
* specifically by this Element class.
*
* @see NamespaceAware
* @see Content
*
* @author Brett McLaughlin
* @author Jason Hunter
* @author Lucas Gonze
* @author Kevin Regan
* @author Dan Schaffer
* @author Yusuf Goolamabbas
* @author Kent C. Johnson
* @author Jools Enticknap
* @author Alex Rosen
* @author Bradley S. Huffman
* @author Victor Toni
* @author Rolf Lear
*
*/
public class Element extends Content implements Parent {
private static final int INITIAL_ARRAY_SIZE = 5;
/** The local name of the element */
protected String name;
/** The namespace of the element */
protected Namespace namespace;
/** Additional namespace declarations to store on this element; useful
* during output */
transient List additionalNamespaces = null;
/**
* The attributes of the element. Subclassers have to
* track attributes using their own mechanism.
*/
transient AttributeList attributes = null; // = new AttributeList(this);
/**
* The content of the element. Subclassers have to
* track content using their own mechanism.
*/
transient ContentList content = new ContentList(this);
/**
* This protected constructor is provided in order to support an Element
* subclass that wants full control over variable initialization. It
* intentionally leaves all instance variables null, allowing a lightweight
* subclass implementation. The subclass is responsible for ensuring all the
* get and set methods on Element behave as documented.
*
* When implementing an Element subclass which doesn't require full control
* over variable initialization, be aware that simply calling super() (or
* letting the compiler add the implicit super() call) will not initialize
* the instance variables which will cause many of the methods to throw a
* NullPointerException. Therefore, the constructor for these subclasses
* should call one of the public constructors so variable initialization is
* handled automatically.
*/
protected Element() {
super(CType.Element);
}
/**
* Creates a new element with the supplied (local) name and namespace. If
* the provided namespace is null, the element will have no namespace.
*
* @param name local name of the element
* @param namespace namespace for the element
* @throws IllegalNameException if the given name is illegal as an element
* name
*/
public Element(final String name, final Namespace namespace) {
super(CType.Element);
setName(name);
setNamespace(namespace);
}
/**
* Create a new element with the supplied (local) name and no namespace.
*
* @param name local name of the element
* @throws IllegalNameException if the given name is illegal as an element
* name.
*/
public Element(final String name) {
this(name, (Namespace) null);
}
/**
* Creates a new element with the supplied (local) name and a namespace
* given by a URI. The element will be put into the unprefixed (default)
* namespace.
*
* @param name name of the element
* @param uri namespace URI for the element
* @throws IllegalNameException if the given name is illegal as an element
* name or the given URI is illegal as a
* namespace URI
*/
public Element(final String name, final String uri) {
this(name, Namespace.getNamespace(NS_PREFIX_DEFAULT, uri));
}
/**
* Creates a new element with the supplied (local) name and a namespace
* given by the supplied prefix and URI combination.
*
* @param name local name of the element
* @param prefix namespace prefix
* @param uri namespace URI for the element
* @throws IllegalNameException if the given name is illegal as an element
* name, the given prefix is illegal as a
* namespace prefix, or the given URI is
* illegal as a namespace URI
*/
public Element(final String name, final String prefix, final String uri) {
this(name, Namespace.getNamespace(prefix, uri));
}
/**
* Returns the (local) name of the element (without any namespace prefix).
*
* @return local element name
*/
public String getName() {
return name;
}
/**
* Sets the (local) name of the element.
*
* @param name the new (local) name of the element
* @return the target element
* @throws IllegalNameException if the given name is illegal as an Element
* name
*/
public Element setName(final String name) {
final String reason = Verifier.checkElementName(name);
if (reason != null) {
throw new IllegalNameException(name, "element", reason);
}
this.name = name;
return this;
}
/**
* Returns the element's {@link Namespace}.
*
* @return the element's namespace
*/
public Namespace getNamespace() {
return namespace;
}
/**
* Sets the element's {@link Namespace}. If the provided namespace is null,
* the element will have no namespace.
*
* @param namespace the new namespace. A null implies Namespace.NO_NAMESPACE.
* @return the target element
* @throws IllegalAddException if there is a Namespace conflict
*/
public Element setNamespace(Namespace namespace) {
if (namespace == null) {
namespace = Namespace.NO_NAMESPACE;
}
if (additionalNamespaces != null) {
final String reason = Verifier.checkNamespaceCollision(namespace,
getAdditionalNamespaces());
if (reason != null) {
throw new IllegalAddException(this, namespace, reason);
}
}
if (hasAttributes()) {
for (Attribute a : getAttributes()) {
final String reason =
Verifier.checkNamespaceCollision(namespace, a);
if (reason != null) {
throw new IllegalAddException(this, namespace, reason);
}
}
}
this.namespace = namespace;
return this;
}
/**
* Returns the namespace prefix of the element or an empty string if none
* exists.
*
* @return the namespace prefix
*/
public String getNamespacePrefix() {
return namespace.getPrefix();
}
/**
* Returns the namespace URI mapped to this element's prefix (or the
* in-scope default namespace URI if no prefix). If no mapping is found, an
* empty string is returned.
*
* @return the namespace URI for this element
*/
public String getNamespaceURI() {
return namespace.getURI();
}
/**
* Returns the {@link Namespace} corresponding to the given prefix in scope
* for this element. This involves searching up the tree, so the results
* depend on the current location of the element. Returns null if there is
* no namespace in scope with the given prefix at this point in the
* document.
*
* @param prefix namespace prefix to look up
* @return the Namespace for this prefix at this
* location, or null if none
*/
public Namespace getNamespace(final String prefix) {
if (prefix == null) {
return null;
}
if (NS_PREFIX_XML.equals(prefix)) {
// Namespace "xml" is always bound.
return Namespace.XML_NAMESPACE;
}
// Check if the prefix is the prefix for this element
if (prefix.equals(getNamespacePrefix())) {
return getNamespace();
}
// Scan the additional namespaces
if (additionalNamespaces != null) {
for (int i = 0; i < additionalNamespaces.size(); i++) {
final Namespace ns = additionalNamespaces.get(i);
if (prefix.equals(ns.getPrefix())) {
return ns;
}
}
}
if (attributes != null) {
for (final Attribute a : attributes) {
if (prefix.equals(a.getNamespacePrefix())) {
return a.getNamespace();
}
}
}
// If we still don't have a match, ask the parent
if (parent instanceof Element) {
return ((Element)parent).getNamespace(prefix);
}
return null;
}
/**
* Returns the full name of the element, in the form
* [namespacePrefix]:[localName]. If the element does not have a namespace
* prefix, then the local name is returned.
*
* @return qualified name of the element (including
* namespace prefix)
*/
public String getQualifiedName() {
// Note: Any changes here should be reflected in
// XMLOutputter.printQualifiedName()
if ("".equals(namespace.getPrefix())) {
return getName();
}
return new StringBuilder(namespace.getPrefix())
.append(':')
.append(name)
.toString();
}
/**
* Adds a namespace declarations to this element. This should not be
* used to add the declaration for this element itself; that should be
* assigned in the construction of the element. Instead, this is for adding
* namespace declarations on the element not relating directly to itself.
* It's used during output to for stylistic reasons move namespace
* declarations higher in the tree than they would have to be.
*
* @param additionalNamespace namespace to add
* @return true if the namespace is added (false if it was previously added)
* @throws IllegalAddException if the namespace prefix collides with another
* namespace prefix on the element
*/
public boolean addNamespaceDeclaration(final Namespace additionalNamespace) {
if (additionalNamespaces == null) {
additionalNamespaces = new ArrayList(INITIAL_ARRAY_SIZE);
}
for (Namespace ns : additionalNamespaces) {
if (ns == additionalNamespace) {
return false;
}
}
// Verify the new namespace prefix doesn't collide with another
// declared namespace, an attribute prefix, or this element's prefix
final String reason = Verifier.checkNamespaceCollision(additionalNamespace, this);
if (reason != null) {
throw new IllegalAddException(this, additionalNamespace, reason);
}
return additionalNamespaces.add(additionalNamespace);
}
/**
* Removes an additional namespace declarations from this element. This
* should not be used to remove the declaration for this element
* itself; that should be handled in the construction of the element.
* Instead, this is for removing namespace declarations on the element not
* relating directly to itself. If the declaration is not present, this
* method does nothing.
*
* @param additionalNamespace namespace to remove. A null Namespace does nothing.
*/
public void removeNamespaceDeclaration(final Namespace additionalNamespace) {
if (additionalNamespaces == null) {
return;
}
additionalNamespaces.remove(additionalNamespace);
}
/**
* Returns a list of the additional namespace declarations on this element.
* This includes only additional namespace, not the namespace of the element
* itself, which can be obtained through {@link #getNamespace()}. If there
* are no additional declarations, this returns an empty list. Note, the
* returned list is unmodifiable.
*
* @return a List of the additional namespace
* declarations
*/
public List getAdditionalNamespaces() {
// Not having the returned list be live allows us to avoid creating a
// new list object when XMLOutputter calls this method on an element
// with an empty list.
if (additionalNamespaces == null) {
return Collections.emptyList();
}
return Collections.unmodifiableList(additionalNamespaces);
}
/**
* Returns the XPath 1.0 string value of this element, which is the
* complete, ordered content of all text node descendants of this element
* (i.e. the text that's left after all references are resolved
* and all other markup is stripped out.)
*
* @return a concatentation of all text node descendants
*/
@Override
public String getValue() {
final StringBuilder buffer = new StringBuilder();
for (Content child : getContent()) {
if (child instanceof Element || child instanceof Text) {
buffer.append(child.getValue());
}
}
return buffer.toString();
}
/**
* Returns whether this element is a root element. This can be used in
* tandem with {@link #getParent} to determine if an element has any
* "attachments" to a parent element or document.
*
* An element is a root element when it has a parent and that parent is a
* Document. In particular, this means that detatched Elements are not
* root elements.
*
* @return whether this is a root element
*/
public boolean isRootElement() {
return parent instanceof Document;
}
@Override
public int getContentSize() {
return content.size();
}
@Override
public int indexOf(final Content child) {
return content.indexOf(child);
}
// private int indexOf(int start, Filter filter) {
// int size = getContentSize();
// for (int i = start; i < size; i++) {
// if (filter.matches(getContent(i))) {
// return i;
// }
// }
// return -1;
// }
/**
* Returns the textual content directly held under this element as a string.
* This includes all text within this single element, including whitespace
* and CDATA sections if they exist. It's essentially the concatenation of
* all {@link Text} and {@link CDATA} nodes returned by {@link #getContent}.
* The call does not recurse into child elements. If no textual value exists
* for the element, an empty string is returned.
*
* @return text content for this element, or empty
* string if none
*/
public String getText() {
if (content.size() == 0) {
return "";
}
// If we hold only a Text or CDATA, return it directly
if (content.size() == 1) {
final Object obj = content.get(0);
if (obj instanceof Text) {
return ((Text) obj).getText();
}
return "";
}
// Else build String up
final StringBuilder textContent = new StringBuilder();
boolean hasText = false;
for (int i = 0; i < content.size(); i++) {
final Object obj = content.get(i);
if (obj instanceof Text) {
textContent.append(((Text) obj).getText());
hasText = true;
}
}
if (!hasText) {
return "";
}
return textContent.toString();
}
/**
* Returns the textual content of this element with all surrounding
* whitespace removed. If no textual value exists for the element, or if
* only whitespace exists, the empty string is returned.
*
* @return trimmed text content for this element, or
* empty string if none
*/
public String getTextTrim() {
return getText().trim();
}
/**
* Returns the textual content of this element with all surrounding
* whitespace removed and internal whitespace normalized to a single space.
* If no textual value exists for the element, or if only whitespace exists,
* the empty string is returned.
*
* @return normalized text content for this element, or
* empty string if none
*/
public String getTextNormalize() {
return Text.normalizeString(getText());
}
/**
* Returns the textual content of the named child element, or null if
* there's no such child. This method is a convenience because calling
* getChild().getText() can throw a NullPointerException.
*
* @param cname the name of the child
* @return text content for the named child, or null if
* no such child
*/
public String getChildText(final String cname) {
final Element child = getChild(cname);
if (child == null) {
return null;
}
return child.getText();
}
/**
* Returns the trimmed textual content of the named child element, or null
* if there's no such child. See {@link #getTextTrim()} for
* details of text trimming.
*
* @param cname the name of the child
* @return trimmed text content for the named child, or
* null if no such child
*/
public String getChildTextTrim(final String cname) {
final Element child = getChild(cname);
if (child == null) {
return null;
}
return child.getTextTrim();
}
/**
* Returns the normalized textual content of the named child element, or
* null if there's no such child. See {@link
* #getTextNormalize()} for details of text normalizing.
*
* @param cname the name of the child
* @return normalized text content for the named child,
* or null if no such child
*/
public String getChildTextNormalize(final String cname) {
final Element child = getChild(cname);
if (child == null) {
return null;
}
return child.getTextNormalize();
}
/**
* Returns the textual content of the named child element, or null if
* there's no such child.
*
* @param cname
* the name of the child
* @param ns
* the namespace of the child. A null implies Namespace.NO_NAMESPACE.
* @return text content for the named child, or null if no such child
*/
public String getChildText(final String cname, final Namespace ns) {
final Element child = getChild(cname, ns);
if (child == null) {
return null;
}
return child.getText();
}
/**
* Returns the trimmed textual content of the named child element, or null
* if there's no such child.
*
* @param cname
* the name of the child
* @param ns
* the namespace of the child. A null implies Namespace.NO_NAMESPACE.
* @return trimmed text content for the named child, or null if no such
* child
*/
public String getChildTextTrim(final String cname, final Namespace ns) {
final Element child = getChild(cname, ns);
if (child == null) {
return null;
}
return child.getTextTrim();
}
/**
* Returns the normalized textual content of the named child element, or
* null if there's no such child.
*
* @param cname
* the name of the child
* @param ns
* the namespace of the child. A null implies Namespace.NO_NAMESPACE.
* @return normalized text content for the named child, or null if no such
* child
*/
public String getChildTextNormalize(final String cname, final Namespace ns) {
final Element child = getChild(cname, ns);
if (child == null) {
return null;
}
return child.getTextNormalize();
}
/**
* Sets the content of the element to be the text given. All existing text
* content and non-text context is removed. If this element should have both
* textual content and nested elements, use {@link #setContent}
* instead. Setting a null text value is equivalent to setting an empty
* string value.
*
* @param text new text content for the element
* @return the target element
* @throws IllegalDataException if the assigned text contains an illegal
* character such as a vertical tab (as
* determined by {@link
* org.jdom2.Verifier#checkCharacterData})
*/
public Element setText(final String text) {
content.clear();
if (text != null) {
addContent(new Text(text));
}
return this;
}
/**
* Adjacent Text content is merged into the first Text in document order,
* and the redundant Text items are removed (including any empty Text).
*
* @param recursively
* true if you want the text of child elements coalesced too. False
* if you only want to coalesce this Element's Text.
* @return true if any content was changed by this operation.
*/
public boolean coalesceText(boolean recursively) {
final Iterator it = recursively ? getDescendants()
: content.iterator();
Text tfirst = null;
boolean changed = false;
while (it.hasNext()) {
final Content c = it.next();
if (c.getCType() == CType.Text) {
// Text, and no CDATA!
final Text text = (Text)c;
if ("".equals(text.getValue())) {
it.remove();
changed = true;
} else if (tfirst == null ||
tfirst.getParent() != text.getParent()) {
// previous item in the iterator was not text, or
// we are the next Text item after coming up the tree.
tfirst = text;
} else {
// add our text to the first in the sequence
tfirst.append(text.getValue());
// remove us from the sequence
it.remove();
changed = true;
}
} else {
// the end of the sequence
tfirst = null;
}
}
return changed;
}
/**
* This returns the full content of the element as a List which
* may contain objects of type Text, Element,
* Comment, ProcessingInstruction,
* CDATA, and EntityRef.
* The List returned is "live" in document order and modifications
* to it affect the element's actual contents. Whitespace content is
* returned in its entirety.
*
*
* Sequential traversal through the List is best done with an Iterator
* since the underlying implement of List.size() may require walking the
* entire list.
*
*
* @return a List containing the mixed content of the
* element: may contain Text,
* {@link Element}, {@link Comment},
* {@link ProcessingInstruction},
* {@link CDATA}, and
* {@link EntityRef} objects.
*/
@Override
public List getContent() {
return content;
}
/**
* Return a filter view of this Element's content.
*
*
* Sequential traversal through the List is best done with a Iterator
* since the underlying implement of List.size() may require walking the
* entire list.
*
*
* @param filter Filter to apply
* @return List - filtered Element content
*/
@Override
public List getContent(final Filter filter) {
return content.getView(filter);
}
/**
* Removes all child content from this parent.
*
* @return list of the old children detached from this parent
*/
@Override
public List removeContent() {
final List old = new ArrayList(content);
content.clear();
return old;
}
/**
* Remove all child content from this parent matching the supplied filter.
*
* @param filter filter to select which content to remove
* @return list of the old children detached from this parent
*/
@Override
public List removeContent(final Filter filter) {
final List old = new ArrayList();
final Iterator iter = content.getView(filter).iterator();
while (iter.hasNext()) {
final F child = iter.next();
old.add(child);
iter.remove();
}
return old;
}
/**
* This sets the content of the element. The supplied List should
* contain only objects of type Element, Text,
* CDATA, Comment,
* ProcessingInstruction, and EntityRef.
*
*
* When all objects in the supplied List are legal and before the new
* content is added, all objects in the old content will have their
* parentage set to null (no parent) and the old content list will be
* cleared. This has the effect that any active list (previously obtained
* with a call to {@link #getContent} or {@link #getChildren}) will also
* change to reflect the new content. In addition, all objects in the
* supplied List will have their parentage set to this element, but the
* List itself will not be "live" and further removals and additions will
* have no effect on this elements content. If the user wants to continue
* working with a "live" list, then a call to setContent should be
* followed by a call to {@link #getContent} or {@link #getChildren} to
* obtain a "live" version of the content.
*
*
*
* Passing a null or empty List clears the existing content.
*
*
*
* In event of an exception the original content will be unchanged and
* the objects in the supplied content will be unaltered.
*
*
* @param newContent Collection of content to set
* @return this element modified
* @throws IllegalAddException if the List contains objects of
* illegal types or with existing parentage.
*/
public Element setContent(final Collection newContent) {
content.clearAndSet(newContent);
return this;
}
/**
* Replace the current child the given index with the supplied child.
*
* In event of an exception the original content will be unchanged and
* the supplied child will be unaltered.
*
*
* @param index - index of child to replace.
* @param child - child to add.
* @return element on which this method was invoked
* @throws IllegalAddException if the supplied child is already attached
* or not legal content for this parent.
* @throws IndexOutOfBoundsException if index is negative or greater
* than the current number of children.
*/
public Element setContent(final int index, final Content child) {
content.set(index, child);
return this;
}
/**
* Replace the child at the given index whith the supplied
* collection.
*
* In event of an exception the original content will be unchanged and
* the content in the supplied collection will be unaltered.
*
*
* @param index - index of child to replace.
* @param newContent - Collection of content to replace child.
* @return object on which this method was invoked
* @throws IllegalAddException if the collection contains objects of
* illegal types.
* @throws IndexOutOfBoundsException if index is negative or greater
* than the current number of children.
*/
public Parent setContent(final int index, final Collection newContent) {
content.remove(index);
content.addAll(index, newContent);
return this;
}
/**
* This adds text content to this element. It does not replace the
* existing content as does setText().
*
* @param str String to add
* @return this element modified
* @throws IllegalDataException if str contains an
* illegal character such as a vertical tab (as determined
* by {@link org.jdom2.Verifier#checkCharacterData})
*/
public Element addContent(final String str) {
return addContent(new Text(str));
}
/**
* Appends the child to the end of the element's content list.
*
* @param child child to append to end of content list
* @return the element on which the method was called
* @throws IllegalAddException if the given child already has a parent. */
@Override
public Element addContent(final Content child) {
content.add(child);
return this;
}
/**
* Appends all children in the given collection to the end of
* the content list. In event of an exception during add the
* original content will be unchanged and the objects in the supplied
* collection will be unaltered.
*
* @param newContent Collection of content to append
* @return the element on which the method was called
* @throws IllegalAddException if any item in the collection
* already has a parent or is of an inappropriate type.
*/
@Override
public Element addContent(final Collection newContent) {
content.addAll(newContent);
return this;
}
/**
* Inserts the child into the content list at the given index.
*
* @param index location for adding the collection
* @param child child to insert
* @return the parent on which the method was called
* @throws IndexOutOfBoundsException if index is negative or beyond
* the current number of children
* @throws IllegalAddException if the given child already has a parent.
*/
@Override
public Element addContent(final int index, final Content child) {
content.add(index, child);
return this;
}
/**
* Inserts the content in a collection into the content list
* at the given index. In event of an exception the original content
* will be unchanged and the objects in the supplied collection will be
* unaltered.
*
* @param index location for adding the collection
* @param newContent Collection of content to insert
* @return the parent on which the method was called
* @throws IndexOutOfBoundsException if index is negative or beyond
* the current number of children
* @throws IllegalAddException if any item in the collection
* already has a parent or is of an inappropriate type.
*/
@Override
public Element addContent(final int index, final Collection newContent) {
content.addAll(index, newContent);
return this;
}
@Override
public List cloneContent() {
final int size = getContentSize();
final List list = new ArrayList(size);
for (int i = 0; i < size; i++) {
final Content child = getContent(i);
list.add(child.clone());
}
return list;
}
@Override
public Content getContent(final int index) {
return content.get(index);
}
// public Content getChild(Filter filter) {
// int i = indexOf(0, filter);
// return (i < 0) ? null : getContent(i);
// }
@Override
public boolean removeContent(final Content child) {
return content.remove(child);
}
@Override
public Content removeContent(final int index) {
return content.remove(index);
}
/**
* Set this element's content to be the supplied child.
*
* If the supplied child is legal content for this parent and before
* it is added, all content in the current content list will
* be cleared and all current children will have their parentage set to
* null.
*
* This has the effect that any active list (previously obtained with
* a call to one of the {@link #getContent} methods will also change
* to reflect the new content. In addition, all content in the supplied
* collection will have their parentage set to this parent. If the user
* wants to continue working with a "live" list of this parent's
* child, then a call to setContent should be followed by a call to one
* of the {@link #getContent} methods to obtain a "live"
* version of the children.
*
* Passing a null child clears the existing content.
*
* In event of an exception the original content will be unchanged and
* the supplied child will be unaltered.
*
* @param child new content to replace existing content
* @return the parent on which the method was called
* @throws IllegalAddException if the supplied child is already attached
* or not legal content for an Element
*/
public Element setContent(final Content child) {
content.clear();
content.add(child);
return this;
}
/**
* Determines if this element is the ancestor of another element.
*
* @param element Element to check against
* @return true if this element is the ancestor of the
* supplied element
*/
public boolean isAncestor(final Element element) {
Parent p = element.getParent();
while (p instanceof Element) {
if (p == this) {
return true;
}
p = p.getParent();
}
return false;
}
/**
* Indicate whether this Element has any attributes.
* Where possible you should call this method before calling getAttributes()
* because calling getAttributes() will create the necessary Attribute List
* memory structures, even if there are no Attributes attached to the
* Element. Calling hasAttributes() first can save memory.
* @return true if this Element has attributes.
*/
public boolean hasAttributes() {
return attributes != null && !attributes.isEmpty();
}
/**
* Indicate whether this Element has any additional Namespace declarations.
* Where possible you should call this method before calling
* {@link #getAdditionalNamespaces()} because calling getAttributes() will
* create an unnecessary List even if there are no Additional Namespaces
* attached to the Element. Calling this method first can save memory and
* time.
* @return true if this Element has additional Namespaces.
*/
public boolean hasAdditionalNamespaces() {
return additionalNamespaces != null && !additionalNamespaces.isEmpty();
}
/**
* Lazy initialiser for the Attribute list.
* @return this Element's Attribute List (creating it if necessary).
*/
AttributeList getAttributeList() {
if (attributes == null) {
attributes = new AttributeList(this);
}
return attributes;
}
/**
*
* This returns the complete set of attributes for this element, as a
* List of Attribute objects in no particular
* order, or an empty list if there are none.
* The returned list is "live" and changes to it affect the
* element's actual attributes.
*
*
* @return attributes for the element
*/
public List getAttributes() {
return getAttributeList();
}
/**
*
* This returns the attribute for this element with the given name
* and within no namespace, or null if no such attribute exists.
*
*
* @param attname name of the attribute to return
* @return attribute for the element
*/
public Attribute getAttribute(final String attname) {
return getAttribute(attname, Namespace.NO_NAMESPACE);
}
/**
*
* This returns the attribute for this element with the given name
* and within the given Namespace, or null if no such attribute exists.
*
*
* @param attname name of the attribute to return
* @param ns Namespace to search within. A null implies Namespace.NO_NAMESPACE.
* @return attribute for the element
*/
public Attribute getAttribute(final String attname, final Namespace ns) {
if (attributes == null) {
return null;
}
return getAttributeList().get(attname, ns);
}
/**
*
* This returns the attribute value for the attribute with the given name
* and within no namespace, null if there is no such attribute, and the
* empty string if the attribute value is empty.
*
*
* @param attname name of the attribute whose value to be returned
* @return the named attribute's value, or null if no such attribute
*/
public String getAttributeValue(final String attname) {
if (attributes == null) {
return null;
}
return getAttributeValue(attname, Namespace.NO_NAMESPACE);
}
/**
*
* This returns the attribute value for the attribute with the given name
* and within no namespace, or the passed-in default if there is no
* such attribute.
*
*
* @param attname name of the attribute whose value to be returned
* @param def a default value to return if the attribute does not exist
* @return the named attribute's value, or the default if no such attribute
*/
public String getAttributeValue(final String attname, final String def) {
if (attributes == null) {
return def;
}
return getAttributeValue(attname, Namespace.NO_NAMESPACE, def);
}
/**
*
* This returns the attribute value for the attribute with the given name
* and within the given Namespace, null if there is no such attribute, and
* the empty string if the attribute value is empty.
*
*
* @param attname name of the attribute whose valud is to be returned
* @param ns Namespace to search within. A null implies Namespace.NO_NAMESPACE.
* @return the named attribute's value, or null if no such attribute
*/
public String getAttributeValue(final String attname, final Namespace ns) {
if (attributes == null) {
return null;
}
return getAttributeValue(attname, ns, null);
}
/**
*
* This returns the attribute value for the attribute with the given name
* and within the given Namespace, or the passed-in default if there is no
* such attribute.
*
*
* @param attname name of the attribute whose valud is to be returned
* @param ns Namespace to search within. A null implies Namespace.NO_NAMESPACE.
* @param def a default value to return if the attribute does not exist
* @return the named attribute's value, or the default if no such attribute
*/
public String getAttributeValue(final String attname, final Namespace ns, final String def) {
if (attributes == null) {
return def;
}
final Attribute attribute = getAttributeList().get(attname, ns);
if (attribute == null) {
return def;
}
return attribute.getValue();
}
/**
*
* This sets the attributes of the element. The supplied Collection should
* contain only objects of type Attribute.
*
*
*
* When all objects in the supplied List are legal and before the new
* attributes are added, all old attributes will have their
* parentage set to null (no parent) and the old attribute list will be
* cleared. This has the effect that any active attribute list (previously
* obtained with a call to {@link #getAttributes}) will also change to
* reflect the new attributes. In addition, all attributes in the supplied
* List will have their parentage set to this element, but the List itself
* will not be "live" and further removals and additions will have no
* effect on this elements attributes. If the user wants to continue
* working with a "live" attribute list, then a call to setAttributes
* should be followed by a call to {@link #getAttributes} to obtain a
* "live" version of the attributes.
*
*
*
* Passing a null or empty List clears the existing attributes.
*
*
*
* In cases where the List contains duplicate attributes, only the last
* one will be retained. This has the same effect as calling
* {@link #setAttribute(Attribute)} sequentially.
*
*
*
* In event of an exception the original attributes will be unchanged and
* the attributes in the supplied attributes will be unaltered.
*
*
* @param newAttributes Collection of attributes to set
* @return this element modified
* @throws IllegalAddException if the List contains objects
* that are not instances of Attribute,
* or if any of the Attribute objects have
* conflicting namespace prefixes.
*/
public Element setAttributes(final Collection newAttributes) {
getAttributeList().clearAndSet(newAttributes);
return this;
}
/**
*
* This sets an attribute value for this element. Any existing attribute
* with the same name and namespace URI is removed.
*
*
* @param name name of the attribute to set
* @param value value of the attribute to set
* @return this element modified
* @throws IllegalNameException if the given name is illegal as an
* attribute name.
* @throws IllegalDataException if the given attribute value is
* illegal character data (as determined by
* {@link org.jdom2.Verifier#checkCharacterData}).
*/
public Element setAttribute(final String name, final String value) {
final Attribute attribute = getAttribute(name);
if (attribute == null) {
final Attribute newAttribute = new Attribute(name, value);
setAttribute(newAttribute);
} else {
attribute.setValue(value);
}
return this;
}
/**
*
* This sets an attribute value for this element. Any existing attribute
* with the same name and namespace URI is removed.
*
*
* @param name name of the attribute to set
* @param value value of the attribute to set
* @param ns namespace of the attribute to set. A null implies Namespace.NO_NAMESPACE.
* @return this element modified
* @throws IllegalNameException if the given name is illegal as an
* attribute name, or if the namespace is an unprefixed default
* namespace
* @throws IllegalDataException if the given attribute value is
* illegal character data (as determined by
* {@link org.jdom2.Verifier#checkCharacterData}).
* @throws IllegalAddException if the attribute namespace prefix
* collides with another namespace prefix on the element.
*/
public Element setAttribute(final String name, final String value, final Namespace ns) {
final Attribute attribute = getAttribute(name, ns);
if (attribute == null) {
final Attribute newAttribute = new Attribute(name, value, ns);
setAttribute(newAttribute);
} else {
attribute.setValue(value);
}
return this;
}
/**
*
* This sets an attribute value for this element. Any existing attribute
* with the same name and namespace URI is removed.
*
*
* @param attribute Attribute to set
* @return this element modified
* @throws IllegalAddException if the attribute being added already has a
* parent or if the attribute namespace prefix collides with another
* namespace prefix on the element.
*/
public Element setAttribute(final Attribute attribute) {
getAttributeList().add(attribute);
return this;
}
/**
*
* This removes the attribute with the given name and within no
* namespace. If no such attribute exists, this method does nothing.
*
*
* @param attname name of attribute to remove
* @return whether the attribute was removed
*/
public boolean removeAttribute(final String attname) {
return removeAttribute(attname, Namespace.NO_NAMESPACE);
}
/**
*
* This removes the attribute with the given name and within the
* given Namespace. If no such attribute exists, this method does
* nothing.
*
*
* @param attname name of attribute to remove
* @param ns namespace URI of attribute to remove. A null implies Namespace.NO_NAMESPACE.
* @return whether the attribute was removed
*/
public boolean removeAttribute(final String attname, final Namespace ns) {
if (attributes == null) {
return false;
}
return getAttributeList().remove(attname, ns);
}
/**
*
* This removes the supplied Attribute should it exist.
*
*
* @param attribute Reference to the attribute to be removed.
* @return whether the attribute was removed
*/
public boolean removeAttribute(final Attribute attribute) {
if (attributes == null) {
return false;
}
return getAttributeList().remove(attribute);
}
/**
*
* This returns a String representation of the
* Element, suitable for debugging. If the XML
* representation of the Element is desired,
* {@link org.jdom2.output.XMLOutputter#outputString(Element)}
* should be used.
*
*
* @return String - information about the
* Element
*/
@Override
public String toString() {
final StringBuilder stringForm = new StringBuilder(64)
.append("[Element: <")
.append(getQualifiedName());
final String nsuri = getNamespaceURI();
if (!"".equals(nsuri)) {
stringForm
.append(" [Namespace: ")
.append(nsuri)
.append("]");
}
stringForm.append("/>]");
return stringForm.toString();
}
/**
*
* This returns a deep clone of this element.
* The new element is detached from its parent, and getParent()
* on the clone will return null.
*
*
* @return the clone of this element
*/
@Override
public Element clone() {
// Ken Rune Helland is our local clone() guru
final Element element = (Element) super.clone();
// name and namespace are references to immutable objects
// so super.clone() handles them ok
// Reference to parent is copied by super.clone()
// (Object.clone()) so we have to remove it
// Actually, super is a Content, which has already detached in the
// clone().
// element.parent = null;
// Reference to content list and attribute lists are copyed by
// super.clone() so we set it new lists if the original had lists
element.content = new ContentList(element);
element.attributes = attributes == null ? null : new AttributeList(element);
// Cloning attributes
if (attributes != null) {
for(int i = 0; i < attributes.size(); i++) {
final Attribute attribute = attributes.get(i);
element.attributes.add(attribute.clone());
}
}
// Cloning additional namespaces
if (additionalNamespaces != null) {
element.additionalNamespaces = new ArrayList(additionalNamespaces);
}
// Cloning content
for(int i = 0; i < content.size(); i++) {
final Content c = content.get(i);
element.content.add(c.clone());
}
return element;
}
/**
* Returns an iterator that walks over all descendants in document order.
*
* @return an iterator to walk descendants
*/
@Override
public IteratorIterable getDescendants() {
return new DescendantIterator(this);
}
/**
* Returns an iterator that walks over all descendants in document order
* applying the Filter to return only content that match the filter rule.
* With filters you can match only Elements, only Comments, Elements or
* Comments, only Elements with a given name and/or prefix, and so on.
*
* @param filter filter to select which descendants to see
* @return an iterator to walk descendants within a filter
*/
@Override
public IteratorIterable getDescendants(final Filter filter) {
return new FilterIterator(new DescendantIterator(this), filter);
}
/**
* This returns a List of all the child elements
* nested directly (one level deep) within this element, as
* Element objects. If this target element has no nested
* elements, an empty List is returned. The returned list is "live"
* in document order and changes to it affect the element's actual
* contents.
*
*
* Sequential traversal through the List is best done with a Iterator
* since the underlying implement of List.size() may not be the most
* efficient.
*
*
*
* No recursion is performed, so elements nested two levels deep
* would have to be obtained with:
*
*
* for(Element oneLevelDeep : topElement.getChildren()) {
* List<Element> twoLevelsDeep = oneLevelDeep.getChildren();
* // Do something with these children
* }
*
*
*
*
* @return list of child Element objects for this element
*/
public List getChildren() {
return content.getView(new ElementFilter());
}
/**
* This returns a List of all the child elements
* nested directly (one level deep) within this element with the given
* local name and belonging to no namespace, returned as
* Element objects. If this target element has no nested
* elements with the given name outside a namespace, an empty List
* is returned. The returned list is "live" in document order
* and changes to it affect the element's actual contents.
*
* Please see the notes for {@link #getChildren}
* for a code example.
*
*
* @param cname local name for the children to match
* @return all matching child elements
*/
public List getChildren(final String cname) {
return getChildren(cname, Namespace.NO_NAMESPACE);
}
/**
* This returns a List of all the child elements
* nested directly (one level deep) within this element with the given
* local name and belonging to the given Namespace, returned as
* Element objects. If this target element has no nested
* elements with the given name in the given Namespace, an empty List
* is returned. The returned list is "live" in document order
* and changes to it affect the element's actual contents.
*
* Please see the notes for {@link #getChildren}
* for a code example.
*
*
* @param cname local name for the children to match
* @param ns Namespace to search within. A null implies Namespace.NO_NAMESPACE.
* @return all matching child elements
*/
public List getChildren(final String cname, final Namespace ns) {
return content.getView(new ElementFilter(cname, ns));
}
/**
* This returns the first child element within this element with the
* given local name and belonging to the given namespace.
* If no elements exist for the specified name and namespace, null is
* returned.
*
* @param cname local name of child element to match
* @param ns Namespace to search within. A null implies Namespace.NO_NAMESPACE.
* @return the first matching child element, or null if not found
*/
public Element getChild(final String cname, final Namespace ns) {
final List elements = content.getView(new ElementFilter(cname, ns));
final Iterator iter = elements.iterator();
if (iter.hasNext()) {
return iter.next();
}
return null;
}
/**
* This returns the first child element within this element with the
* given local name and belonging to no namespace.
* If no elements exist for the specified name and namespace, null is
* returned.
*
* @param cname local name of child element to match
* @return the first matching child element, or null if not found
*/
public Element getChild(final String cname) {
return getChild(cname, Namespace.NO_NAMESPACE);
}
/**
*
* This removes the first child element (one level deep) with the
* given local name and belonging to no namespace.
* Returns true if a child was removed.
*
*
* @param cname the name of child elements to remove
* @return whether deletion occurred
*/
public boolean removeChild(final String cname) {
return removeChild(cname, Namespace.NO_NAMESPACE);
}
/**
*
* This removes the first child element (one level deep) with the
* given local name and belonging to the given namespace.
* Returns true if a child was removed.
*
*
* @param cname the name of child element to remove
* @param ns Namespace to search within. A null implies Namespace.NO_NAMESPACE.
* @return whether deletion occurred
*/
public boolean removeChild(final String cname, final Namespace ns) {
final ElementFilter filter = new ElementFilter(cname, ns);
final List old = content.getView(filter);
final Iterator iter = old.iterator();
if (iter.hasNext()) {
iter.next();
iter.remove();
return true;
}
return false;
}
/**
*
* This removes all child elements (one level deep) with the
* given local name and belonging to no namespace.
* Returns true if any were removed.
*
*
* @param cname the name of child elements to remove
* @return whether deletion occurred
*/
public boolean removeChildren(final String cname) {
return removeChildren(cname, Namespace.NO_NAMESPACE);
}
/**
*
* This removes all child elements (one level deep) with the
* given local name and belonging to the given namespace.
* Returns true if any were removed.
*
*
* @param cname the name of child elements to remove
* @param ns Namespace to search within. A null implies Namespace.NO_NAMESPACE.
* @return whether deletion occurred
*/
public boolean removeChildren(final String cname, final Namespace ns) {
boolean deletedSome = false;
final ElementFilter filter = new ElementFilter(cname, ns);
final List old = content.getView(filter);
final Iterator iter = old.iterator();
while (iter.hasNext()) {
iter.next();
iter.remove();
deletedSome = true;
}
return deletedSome;
}
/**
* Get the Namespaces that are in-scope on this Element. Element has the
* most complex rules for the namespaces-in-scope.
*
* The scope is built up from a number of sources following the rules of
* XML namespace inheritence as follows:
*
* - The {@link Namespace#XML_NAMESPACE} is added
*
- The element's namespace is added (commonly
* {@link Namespace#NO_NAMESPACE})
*
- All the attributes are inspected and their Namespaces are included
*
- All Namespaces declared on this Element using
* {@link #addNamespaceDeclaration(Namespace)} are included.
*
- If the element has a parent then the parent's Namespace scope is
* inspected, and any prefixes in the parent scope that are not yet bound
* in this Element's scope are included.
*
- If the default Namespace (the no-prefix namespace) has not been
* encountered for this Element then {@link Namespace#NO_NAMESPACE} is
* included.
*
* The Element's Namespace scope consist of it's inherited Namespaces and
* any modifications to that scope derived from the Element itself. If the
* element is detached then it's inherited scope consists of just
* If an element has no parent then
*
* Note that the Element's Namespace will always be reported first.
*
* Description copied from
* {@link NamespaceAware#getNamespacesInScope()}:
*
* {@inheritDoc}
*
* @see NamespaceAware
*/
@Override
public List getNamespacesInScope() {
// The assumption here is that all namespaces are valid,
// that there are no namespace collisions on this element
// This method is also the 'anchor' of the three getNamespaces*() methods
// It does not make reference to this Element instance's other
// getNamespace*() methods
TreeMap namespaces = new TreeMap();
namespaces.put(Namespace.XML_NAMESPACE.getPrefix(), Namespace.XML_NAMESPACE);
namespaces.put(getNamespacePrefix(), getNamespace());
if (additionalNamespaces != null) {
for (Namespace ns : getAdditionalNamespaces()) {
if (!namespaces.containsKey(ns.getPrefix())) {
namespaces.put(ns.getPrefix(), ns);
}
}
}
if (attributes != null) {
for (Attribute att : getAttributes()) {
Namespace ns = att.getNamespace();
if (!namespaces.containsKey(ns.getPrefix())) {
namespaces.put(ns.getPrefix(), ns);
}
}
}
// Right, we now have all the namespaces that are current on this ELement.
// Include any other namespaces that are inherited.
final Element pnt = getParentElement();
if (pnt != null) {
for (Namespace ns : pnt.getNamespacesInScope()) {
if (!namespaces.containsKey(ns.getPrefix())) {
namespaces.put(ns.getPrefix(), ns);
}
}
}
if (pnt == null && !namespaces.containsKey("")) {
// we are the root element, and there is no 'default' namespace.
namespaces.put(Namespace.NO_NAMESPACE.getPrefix(), Namespace.NO_NAMESPACE);
}
ArrayList al = new ArrayList(namespaces.size());
al.add(getNamespace());
namespaces.remove(getNamespacePrefix());
al.addAll(namespaces.values());
return Collections.unmodifiableList(al);
}
@Override
public List getNamespacesInherited() {
if (getParentElement() == null) {
ArrayList ret = new ArrayList(getNamespacesInScope());
for (Iterator it = ret.iterator(); it.hasNext();) {
Namespace ns = it.next();
if (ns == Namespace.NO_NAMESPACE || ns == Namespace.XML_NAMESPACE) {
continue;
}
it.remove();
}
return Collections.unmodifiableList(ret);
}
// OK, the things we inherit are the prefixes we have in scope that
// are also in our parent's scope.
HashMap parents = new HashMap();
for (Namespace ns : getParentElement().getNamespacesInScope()) {
parents.put(ns.getPrefix(), ns);
}
ArrayList al = new ArrayList();
for (Namespace ns : getNamespacesInScope()) {
if (ns == parents.get(ns.getPrefix())) {
// inherited
al.add(ns);
}
}
return Collections.unmodifiableList(al);
}
@Override
public List getNamespacesIntroduced() {
if (getParentElement() == null) {
// we introduce everything... except Namespace.XML_NAMESPACE
List ret = new ArrayList(getNamespacesInScope());
for (Iterator it = ret.iterator(); it.hasNext(); ) {
Namespace ns = it.next();
if (ns == Namespace.XML_NAMESPACE || ns == Namespace.NO_NAMESPACE) {
it.remove();
}
}
return Collections.unmodifiableList(ret);
}
// OK, the things we introduce are the prefixes we have in scope that
// are *not* in our parent's scope.
HashMap parents = new HashMap();
for (Namespace ns : getParentElement().getNamespacesInScope()) {
parents.put(ns.getPrefix(), ns);
}
ArrayList al = new ArrayList();
for (Namespace ns : getNamespacesInScope()) {
if (!parents.containsKey(ns.getPrefix()) || ns != parents.get(ns.getPrefix())) {
// introduced
al.add(ns);
}
}
return Collections.unmodifiableList(al);
}
@Override
public Element detach() {
return (Element)super.detach();
}
@Override
public void canContainContent(Content child, int index, boolean replace) throws IllegalAddException {
if (child instanceof DocType) {
throw new IllegalAddException(
"A DocType is not allowed except at the document level");
}
}
/**
* Sort the contents of this Element using a mechanism that is safe for JDOM
* content. See the notes on {@link #sortContent(Filter, Comparator)} for
* how the algorithm works.
*
* {@link Collections#sort(List, Comparator)} is not appropriate for sorting
* the Lists returned from {@link Element#getContent()} because those are
* 'live' lists, and the Collections.sort() method uses an algorithm that
* adds the content in the new location before removing it from the old.
* That creates validation issues with content attempting to attach to a
* parent before detaching first.
*
* This method provides a safe means to conveniently sort the content.
*
* @param comparator The Comparator to use for the sorting.
*/
public void sortContent(Comparator comparator) {
content.sort(comparator);
}
/**
* Sort the child Elements of this Element using a mechanism that is safe
* for JDOM content. Other child content will be unaffected. See the notes
* on {@link #sortContent(Filter, Comparator)} for how the algorithm works.
*
* {@link Collections#sort(List, Comparator)} is not appropriate for sorting
* the Lists returned from {@link Element#getContent()} because those are
* 'live' lists, and the Collections.sort() method uses an algorithm that
* adds the content in the new location before removing it from the old.
* This creates validation issues with content attempting to attach to a
* parent before detaching first.
*
* This method provides a safe means to conveniently sort the content.
*
* @param comparator The Comparator to use for the sorting.
*/
public void sortChildren(Comparator comparator) {
((FilterList)getChildren()).sort(comparator);
}
/**
* Sort the Attributes of this Element using a mechanism that is safe
* for JDOM. Other child content will be unaffected. See the notes
* on {@link #sortContent(Filter, Comparator)} for how the algorithm works.
*
* {@link Collections#sort(List, Comparator)} is not appropriate for sorting
* the Lists returned from {@link Element#getContent()} because those are
* 'live' lists, and the Collections.sort() method uses an algorithm that
* adds the content in the new location before removing it from the old.
* This creates validation issues with content attempting to attach to a
* parent before detaching first.
*
* This method provides a safe means to conveniently sort the content.
*
* A null comparator will sort the Attributes alphabetically first by prefix,
* then by name
*
* @param comparator The Comparator to use for the sorting.
*/
public void sortAttributes(Comparator comparator) {
if (attributes != null) {
attributes.sort(comparator);
}
}
/**
* Sort the child content of this Element that matches the Filter, using a
* mechanism that is safe for JDOM content. Other child content (that does
* not match the filter) will be unaffected.
*
* The algorithm used for sorting affects the child content in the following
* ways:
*
* - Items not matching the Filter will be unchanged. This includes the
* absolute position of that content in this Element. i.e. if child content
*
cc does not match the Filter, then indexOf(cc)
* will not be changed by this sort.
* - Items matching the Filter will be reordered according to the
* comparator. Only the relative order of the Filtered data will change.
*
- Items that compare as 'equals' using the comparator will keep the
* the same relative order as before the sort.
*
*
* {@link Collections#sort(List, Comparator)} is not appropriate for sorting
* the Lists returned from {@link Element#getContent()} because those are
* 'live' lists, and the Collections.sort() method uses an algorithm that
* adds the content in the new location before removing it from the old.
* This creates validation issues with content attempting to attach to a
* parent before detaching first.
*
* This method provides a safe means to conveniently sort the content.
* @param The generic type of the Filter used to select the content to
* sort.
* @param filter The Filter used to select which child content to sort.
* @param comparator The Comparator to use for the sorting.
*/
public void sortContent(Filter filter, Comparator comparator) {
final FilterList list = (FilterList)getContent(filter);
list.sort(comparator);
}
/**
* Simple method that supports getXMLBaseURI().
* @param uri 'currently' URI as a string
* @param relative the relative URI we are trying to make absolute
* @return the resulting URI, may be null.
* @throws URISyntaxException for URI problems.
*/
private final URI resolve(String uri, URI relative)
throws URISyntaxException {
if (uri == null) {
return relative;
}
final URI n = new URI(uri);
if (relative == null) {
return n;
}
return n.resolve(relative);
}
/**
* Calculate the XMLBase URI for this Element using the rules defined in the
* XMLBase specification, as well as the values supplied in the xml:base
* attributes on this Element and its ancestry.
*
* This method assumes that all values in xml:base attributes
* are valid URI values according to the java.net.URI
* implementation. The same implementation is used to resolve relative URI
* values, and thus this code follows the assumptions in java.net.URI.
*
* This technically deviates from the XMLBase spec because to fully support
* legacy HTML the xml:base attribute could contain what is called a 'LIERI'
* which is a superset of true URI values, but for practical purposes JDOM
* users should never encounter such values because they are not processing
* raw HTML (but xhtml maybe).
*
* @return a URI representing the XMLBase value for the supplied Element, or
* null if one could not be calculated.
* @throws URISyntaxException
* if it is not possible to create java.net.URI values from the data
* in the xml:base attributes.
*/
public URI getXMLBaseURI() throws URISyntaxException {
Parent p = this;
URI ret = null;
while (p != null) {
if (p instanceof Element) {
ret = resolve(((Element) p).getAttributeValue("base",
Namespace.XML_NAMESPACE), ret);
} else {
ret = resolve(((Document) p).getBaseURI(), ret);
}
if (ret != null && ret.isAbsolute()) {
return ret;
}
p = p.getParent();
}
return ret;
}
/**
* JDOM2 Serialization. In this case, DocType is simple.
*/
private static final long serialVersionUID = 200L;
/**
* Serialize out the Element.
*
* @serialData
* The Stream protocol is:
*
* - The Element name and Namespace using default Serialization.
*
- The count of additional Namespace Declarations.
*
- The actual additional Namespace Declarations.
*
- The count of Attributes.
*
- The actual Attributes.
*
- The count of child Content
*
- The actual Child Content.
*
*
* @param out where to write the Element to.
* @throws IOException if there is a writing problem.
*/
private void writeObject(final ObjectOutputStream out) throws IOException {
// sends out the name and namespace.
out.defaultWriteObject();
if (hasAdditionalNamespaces()) {
final int ans = additionalNamespaces.size();
out.writeInt(ans);
for (int i = 0; i < ans; i++) {
out.writeObject(additionalNamespaces.get(i));
}
} else {
out.writeInt(0);
}
if (hasAttributes()) {
final int ans = attributes.size();
out.writeInt(ans);
for (int i = 0; i < ans; i++) {
out.writeObject(attributes.get(i));
}
} else {
out.writeInt(0);
}
final int cs = content.size();
out.writeInt(cs);
for (int i = 0; i < cs; i++) {
out.writeObject(content.get(i));
}
}
/**
* Read an Element off the ObjectInputStream.
*
* @see #writeObject(ObjectOutputStream)
* @param in where to read the Element from.
* @throws IOException if there is a reading problem.
* @throws ClassNotFoundException when a class cannot be found
*/
private void readObject(final ObjectInputStream in)
throws IOException, ClassNotFoundException {
in.defaultReadObject();
content = new ContentList(this);
int nss = in.readInt();
while (--nss >= 0) {
addNamespaceDeclaration((Namespace)in.readObject());
}
int ats = in.readInt();
while (--ats >= 0) {
setAttribute((Attribute)in.readObject());
}
int cs = in.readInt();
while (--cs >= 0) {
addContent((Content)in.readObject());
}
}
}