mirror of git://gcc.gnu.org/git/gcc.git
583 lines
16 KiB
Java
583 lines
16 KiB
Java
/* DomElement.java --
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Copyright (C) 1999,2000,2001,2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.xml.dom;
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import java.util.HashSet;
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import java.util.Set;
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import javax.xml.XMLConstants;
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import org.w3c.dom.Attr;
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import org.w3c.dom.DOMException;
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import org.w3c.dom.Element;
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import org.w3c.dom.NamedNodeMap;
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import org.w3c.dom.Node;
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import org.w3c.dom.TypeInfo;
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/**
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* <p> "Element" implementation.
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*
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* @author David Brownell
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* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
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*/
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public class DomElement
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extends DomNsNode
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implements Element
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{
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/**
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* User-defined ID attributes.
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* Used by DomAttr.isId and DomDocument.getElementById
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*/
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Set userIdAttrs;
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// Attributes are VERY expensive in DOM, and not just for
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// this implementation. Avoid creating them.
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private DomNamedNodeMap attributes;
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// xml:space cache
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String xmlSpace = "";
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/**
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* Constructs an Element node associated with the specified document.
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*
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* <p>This constructor should only be invoked by a Document as part
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* of its createElement functionality, or through a subclass which is
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* similarly used in a "Sub-DOM" style layer.
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*
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* @param owner The document with which this node is associated
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* @param namespaceURI Combined with the local part of the name,
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* this is used to uniquely identify a type of element
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* @param name Name of this element, which may include a prefix
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*/
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protected DomElement(DomDocument owner, String namespaceURI, String name)
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{
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super(ELEMENT_NODE, owner, namespaceURI, name);
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}
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/**
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* <p>
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* Constructs an Element node associated with the specified document.
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* This constructor should only be invoked by a Document as part
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* of its createElement functionality, or through a subclass which is
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* similarly used in a "Sub-DOM" style layer.
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* </p>
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* <p>
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* With this constructor, the prefix and local part are given explicitly
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* rather than being computed. This allows them to be explicitly set to
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* {@code null} as required by {@link Document#createElement(String)}.
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* </p>
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*
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* @param owner The document with which this node is associated
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* @param namespaceURI Combined with the local part of the name,
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* this is used to uniquely identify a type of element
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* @param name Name of this element, which may include a prefix
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* @param prefix the namespace prefix of the name. May be {@code null}.
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* @param localName the local part of the name. May be {@code null}.
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*/
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protected DomElement(DomDocument owner, String namespaceURI, String name,
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String prefix, String localName)
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{
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super(ELEMENT_NODE, owner, namespaceURI, name, prefix, localName);
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}
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/**
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* <b>DOM L1</b>
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* Returns the element's attributes
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*/
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public NamedNodeMap getAttributes()
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{
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if (attributes == null)
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{
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attributes = new DomNamedNodeMap(this, Node.ATTRIBUTE_NODE);
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}
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return attributes;
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}
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/**
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* <b>DOM L2></b>
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* Returns true iff this is an element node with attributes.
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*/
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public boolean hasAttributes()
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{
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return attributes != null && attributes.length != 0;
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}
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/**
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* Shallow clone of the element, except that associated
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* attributes are (deep) cloned.
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*/
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public Object clone()
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{
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DomElement node = (DomElement) super.clone();
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if (attributes != null)
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{
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node.attributes = new DomNamedNodeMap(node, Node.ATTRIBUTE_NODE);
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for (DomNode ctx = attributes.first; ctx != null; ctx = ctx.next)
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{
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node.attributes.setNamedItem(ctx.cloneNode(true), true, true);
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}
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}
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return node;
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}
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void setOwner(DomDocument doc)
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{
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if (attributes != null)
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{
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for (DomNode ctx = attributes.first; ctx != null; ctx = ctx.next)
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{
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ctx.setOwner(doc);
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}
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}
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super.setOwner(doc);
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}
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/**
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* Marks this element, its children, and its associated attributes as
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* readonly.
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*/
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public void makeReadonly()
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{
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super.makeReadonly();
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if (attributes != null)
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{
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attributes.makeReadonly();
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}
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}
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/**
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* <b>DOM L1</b>
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* Returns the element name (same as getNodeName).
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*/
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final public String getTagName()
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{
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return getNodeName();
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}
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/**
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* <b>DOM L1</b>
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* Returns the value of the specified attribute, or an
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* empty string.
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*/
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public String getAttribute(String name)
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{
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if ("xml:space" == name) // NB only works on interned string
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{
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// Use cached value
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return xmlSpace;
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}
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Attr attr = getAttributeNode(name);
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return (attr == null) ? "" : attr.getValue();
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}
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/**
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* <b>DOM L2</b>
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* Returns true if the element has an attribute with the
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* specified name (specified or DTD defaulted).
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*/
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public boolean hasAttribute(String name)
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{
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return getAttributeNode(name) != null;
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}
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/**
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* <b>DOM L2</b>
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* Returns true if the element has an attribute with the
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* specified name (specified or DTD defaulted).
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*/
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public boolean hasAttributeNS(String namespaceURI, String local)
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{
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return getAttributeNodeNS(namespaceURI, local) != null;
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}
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/**
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* <b>DOM L2</b>
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* Returns the value of the specified attribute, or an
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* empty string.
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*/
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public String getAttributeNS(String namespaceURI, String local)
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{
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Attr attr = getAttributeNodeNS(namespaceURI, local);
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return (attr == null) ? "" : attr.getValue();
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}
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/**
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* <b>DOM L1</b>
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* Returns the appropriate attribute node; the name is the
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* nodeName property of the attribute.
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*/
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public Attr getAttributeNode(String name)
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{
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return (attributes == null) ? null :
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(Attr) attributes.getNamedItem(name);
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}
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/**
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* <b>DOM L2</b>
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* Returns the appropriate attribute node; the name combines
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* the namespace name and the local part.
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*/
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public Attr getAttributeNodeNS(String namespace, String localPart)
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{
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return (attributes == null) ? null :
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(Attr) attributes.getNamedItemNS(namespace, localPart);
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}
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/**
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* <b>DOM L1</b>
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* Modifies an existing attribute to have the specified value,
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* or creates a new one with that value. The name used is the
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* nodeName value.
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*/
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public void setAttribute(String name, String value)
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{
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Attr attr = getAttributeNode(name);
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if (attr != null)
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{
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attr.setNodeValue(value);
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((DomAttr) attr).setSpecified(true);
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return;
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}
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attr = owner.createAttribute(name);
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attr.setNodeValue(value);
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setAttributeNode(attr);
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}
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/**
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* <b>DOM L2</b>
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* Modifies an existing attribute to have the specified value,
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* or creates a new one with that value.
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*/
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public void setAttributeNS(String uri, String aname, String value)
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{
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if (("xmlns".equals (aname) || aname.startsWith ("xmlns:"))
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&& !XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals (uri))
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{
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throw new DomDOMException(DOMException.NAMESPACE_ERR,
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"setting xmlns attribute to illegal value", this, 0);
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}
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Attr attr = getAttributeNodeNS(uri, aname);
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if (attr != null)
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{
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attr.setNodeValue(value);
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return;
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}
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attr = owner.createAttributeNS(uri, aname);
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attr.setNodeValue(value);
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setAttributeNodeNS(attr);
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}
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/**
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* <b>DOM L1</b>
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* Stores the specified attribute, optionally overwriting any
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* existing one with that name.
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*/
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public Attr setAttributeNode(Attr attr)
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{
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return (Attr) getAttributes().setNamedItem(attr);
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}
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/**
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* <b>DOM L2</b>
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* Stores the specified attribute, optionally overwriting any
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* existing one with that name.
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*/
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public Attr setAttributeNodeNS(Attr attr)
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{
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return (Attr) getAttributes().setNamedItemNS(attr);
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}
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/**
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* <b>DOM L1</b>
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* Removes the appropriate attribute node.
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* If there is no such node, this is (bizarrely enough) a NOP so you
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* won't see exceptions if your code deletes non-existent attributes.
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*
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* <p>Note that since there is no portable way for DOM to record
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* DTD information, default values for attributes will never be
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* provided automatically.
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*/
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public void removeAttribute(String name)
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{
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if (attributes == null)
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{
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return;
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}
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try
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{
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attributes.removeNamedItem(name);
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}
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catch (DomDOMException e)
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{
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if (e.code != DOMException.NOT_FOUND_ERR)
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{
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throw e;
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}
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}
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}
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/**
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* <b>DOM L1</b>
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* Removes the appropriate attribute node; the name is the
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* nodeName property of the attribute.
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*
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* <p>Note that since there is no portable way for DOM to record
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* DTD information, default values for attributes will never be
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* provided automatically.
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*/
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public Attr removeAttributeNode(Attr node)
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{
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if (attributes == null)
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{
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throw new DomDOMException(DOMException.NOT_FOUND_ERR, null, node, 0);
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}
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return (Attr) attributes.removeNamedItem(node.getNodeName());
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}
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/**
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* <b>DOM L2</b>
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* Removes the appropriate attribute node; the name combines
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* the namespace name and the local part.
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*
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* <p>Note that since there is no portable way for DOM to record
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* DTD information, default values for attributes will never be
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* provided automatically.
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*/
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public void removeAttributeNS(String namespace, String localPart)
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{
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if (attributes == null)
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{
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throw new DomDOMException(DOMException.NOT_FOUND_ERR, localPart, null, 0);
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}
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attributes.removeNamedItemNS (namespace, localPart);
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}
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// DOM Level 3 methods
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public String lookupPrefix(String namespaceURI)
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{
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if (namespaceURI == null)
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{
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return null;
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}
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String namespace = getNamespaceURI();
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if (namespace != null && namespace.equals(namespaceURI))
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{
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return getPrefix();
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}
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if (attributes != null)
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{
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for (DomNode ctx = attributes.first; ctx != null; ctx = ctx.next)
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{
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if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI
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.equals(ctx.getNamespaceURI()))
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{
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String value = ctx.getNodeValue();
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if (value.equals(namespaceURI))
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{
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return ctx.getLocalName();
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}
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}
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}
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}
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return super.lookupPrefix(namespaceURI);
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}
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public boolean isDefaultNamespace(String namespaceURI)
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{
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String namespace = getNamespaceURI();
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if (namespace != null && namespace.equals(namespaceURI))
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{
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return getPrefix() == null;
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}
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if (attributes != null)
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{
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for (DomNode ctx = attributes.first; ctx != null; ctx = ctx.next)
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{
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if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI
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.equals(ctx.getNamespaceURI()))
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{
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String qName = ctx.getNodeName();
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return (XMLConstants.XMLNS_ATTRIBUTE.equals(qName));
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}
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}
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}
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return super.isDefaultNamespace(namespaceURI);
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}
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public String lookupNamespaceURI(String prefix)
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{
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String namespace = getNamespaceURI();
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if (namespace != null && equal(prefix, getPrefix()))
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{
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return namespace;
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}
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if (attributes != null)
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{
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for (DomNode ctx = attributes.first; ctx != null; ctx = ctx.next)
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{
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if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI
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.equals(ctx.getNamespaceURI()))
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{
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if (prefix == null)
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{
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if (XMLConstants.XMLNS_ATTRIBUTE.equals(ctx.getNodeName()))
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{
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return ctx.getNodeValue();
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}
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}
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else
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{
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if (prefix.equals(ctx.getLocalName()))
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{
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return ctx.getNodeValue();
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}
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}
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}
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}
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}
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return super.lookupNamespaceURI(prefix);
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}
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public String getBaseURI()
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{
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if (attributes != null)
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{
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Node xmlBase =
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attributes.getNamedItemNS(XMLConstants.XML_NS_URI, "base");
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if (xmlBase != null)
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{
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return xmlBase.getNodeValue();
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}
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}
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return super.getBaseURI();
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}
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public TypeInfo getSchemaTypeInfo()
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{
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// DTD implementation
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DomDoctype doctype = (DomDoctype) owner.getDoctype();
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if (doctype != null)
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{
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return doctype.getElementTypeInfo(getNodeName());
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}
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// TODO XML Schema implementation
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return null;
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}
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public void setIdAttribute(String name, boolean isId)
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{
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NamedNodeMap attrs = getAttributes();
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Attr attr = (Attr) attrs.getNamedItem(name);
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setIdAttributeNode(attr, isId);
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}
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public void setIdAttributeNode(Attr attr, boolean isId)
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{
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if (readonly)
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{
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throw new DomDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR);
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}
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if (attr == null || attr.getOwnerElement() != this)
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{
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throw new DomDOMException(DOMException.NOT_FOUND_ERR);
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}
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if (isId)
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{
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if (userIdAttrs == null)
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{
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userIdAttrs = new HashSet();
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}
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userIdAttrs.add(attr);
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}
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else if (userIdAttrs != null)
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{
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userIdAttrs.remove(attr);
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if (userIdAttrs.isEmpty())
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{
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userIdAttrs = null;
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}
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}
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|
}
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|
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public void setIdAttributeNS(String namespaceURI, String localName,
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boolean isId)
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|
{
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NamedNodeMap attrs = getAttributes();
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Attr attr = (Attr) attrs.getNamedItemNS(namespaceURI, localName);
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setIdAttributeNode(attr, isId);
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}
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public boolean isEqualNode(Node arg)
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{
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if (!super.isEqualNode(arg))
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return false;
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getAttributes();
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NamedNodeMap argAttrs = arg.getAttributes();
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int len = argAttrs.getLength();
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if (argAttrs == null || (len != attributes.length))
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return false;
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for (int i = 0; i < len; i++)
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{
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Node argCtx = argAttrs.item(i);
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// Don't compare namespace nodes
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|
if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI
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.equals(argCtx.getNamespaceURI()))
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continue;
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// Find corresponding attribute node
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DomNode ctx = attributes.first;
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for (; ctx != null; ctx = ctx.next)
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{
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if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI
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.equals(ctx.getNamespaceURI()))
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continue;
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if (!ctx.isEqualNode(argCtx))
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continue;
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break;
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}
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if (ctx == null)
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return false; // not found
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}
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return true;
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}
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}
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