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+/* DomAttr.java -- 
+   Copyright (C) 1999,2000,2001,2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.xml.dom;
+
+import org.w3c.dom.Attr;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+import org.w3c.dom.TypeInfo;
+import org.w3c.dom.events.MutationEvent;
+
+
+/**
+ * <p> "Attr" implementation.  In DOM, attributes cost quite a lot of
+ * memory because their values are complex structures rather than just
+ * simple strings.  To reduce your costs, avoid having more than one
+ * child of an attribute; stick to a single Text node child, and ignore
+ * even that by using the attribute's "nodeValue" property.</p>
+ *
+ * <p> As a bit of general advice, only look at attribute modification
+ * events through the DOMAttrModified event (sent to the associated
+ * element).  Implementations are not guaranteed to report other events
+ * in the same order, so you're very likely to write nonportable code if
+ * you monitor events at the "children of Attr" level.</p>
+ *
+ * <p> At this writing, not all attribute modifications will cause the
+ * DOMAttrModified event to be triggered ... only the ones using the string
+ * methods (setNodeValue, setValue, and Element.setAttribute) to modify
+ * those values.  That is, if you manipulate those children directly,
+ * elements won't get notified that attribute values have changed.
+ * The natural fix for that will report other modifications, but won't 
+ * be able to expose "previous" attribute value; it'll need to be cached
+ * or something (at which point why bother using child nodes). </p>
+ *
+ * <p><em>You are strongly advised not to use "children" of any attribute
+ * nodes you work with.</em> </p>
+ *
+ * @author David Brownell
+ * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
+ */
+public class DomAttr
+  extends DomNsNode
+  implements Attr
+{
+  
+  private boolean specified;
+  private String value; // string value cache
+  
+  /**
+   * Constructs an Attr node associated with the specified document.
+   * The "specified" flag is initialized to true, since this DOM has
+   * no current "back door" mechanisms to manage default values so
+   * that every value must effectively be "specified".
+   *
+   * <p>This constructor should only be invoked by a Document as part of
+   * its createAttribute functionality, or through a subclass which is
+   * similarly used in a "Sub-DOM" style layer.
+   *
+   * @param owner The document with which this node is associated
+   * @param namespaceURI Combined with the local part of the name,
+   *	this is used to uniquely identify a type of attribute
+   * @param name Name of this attribute, which may include a prefix
+   */
+  protected DomAttr(DomDocument owner, String namespaceURI, String name)
+  {
+    super(ATTRIBUTE_NODE, owner, namespaceURI, name);
+    specified = true;
+    length = 1;
+    
+    // XXX register self to get insertion/removal events
+    // and character data change events and when they happen,
+    // report self-mutation
+  }
+  
+  /**
+   * <b>DOM L1</b>
+   * Returns the attribute name (same as getNodeName)
+   */
+  public final String getName()
+  {
+    return getNodeName();
+  }
+  
+  /**
+   * <b>DOM L1</b>
+   * Returns true if a parser reported this was in the source text.
+   */
+  public final boolean getSpecified()
+  {
+    return specified;
+  }
+  
+  /**
+   * Records whether this attribute was in the source text.
+   */
+  public final void setSpecified(boolean value)
+  {
+    specified = value;
+  }
+
+  /**
+   * <b>DOM L1</b>
+   * Returns the attribute value, with character and entity
+   * references substituted.
+   * <em>NOTE:  entity refs as children aren't currently handled.</em>
+   */
+  public String getNodeValue()
+  {
+    // If we have a simple node-value, use that
+    if (first == null)
+      {
+        return (value == null) ? "" : value;
+      }
+    // Otherwise collect child node-values
+    StringBuffer buf = new StringBuffer();
+    for (DomNode ctx = first; ctx != null; ctx = ctx.next)
+      {
+        switch (ctx.nodeType)
+          {
+          case Node.TEXT_NODE:
+            buf.append(ctx.getNodeValue());
+            break;
+          case Node.ENTITY_REFERENCE_NODE:
+            // TODO
+            break;
+          }
+      }
+    return buf.toString();
+  }
+  
+  /**
+   * <b>DOM L1</b>
+   * Assigns the value of the attribute; it will have one child,
+   * which is a text node with the specified value (same as
+   * setNodeValue).
+   */
+  public final void setValue(String value)
+  {
+    setNodeValue(value);
+  }
+  
+  /**
+   * <b>DOM L1</b>
+   * Returns the value of the attribute as a non-null string; same
+   * as getNodeValue.
+   * <em>NOTE:  entity refs as children aren't currently handled.</em>
+   */
+  public final String getValue()
+  {
+    return getNodeValue();
+  }
+  
+  /**
+   * <b>DOM L1</b>
+   * Assigns the attribute value; using this API, no entity or
+   * character references will exist.
+   * Causes a DOMAttrModified mutation event to be sent.
+   */
+  public void setNodeValue(String value)
+  {
+    if (readonly)
+      {
+        throw new DomEx(DomEx.NO_MODIFICATION_ALLOWED_ERR);
+      }
+    if (value == null)
+      {
+        value = "";
+      }
+    String oldValue = getNodeValue();
+    while (last != null)
+      {
+        removeChild(last);
+      }
+    // don't create a new node just for this...
+    /*
+     Node text = owner.createTextNode(value);
+     appendChild(text);
+     */
+    this.value = value;
+    length = 1;
+    specified = true;
+    
+    mutating(oldValue, value, MutationEvent.MODIFICATION);
+  }
+
+  public final Node getFirstChild()
+  {
+    // Create a child text node if necessary
+    if (first == null)
+      {
+        length = 0;
+        Node text = owner.createTextNode((value == null) ? "" : value);
+        appendChild(text);
+      }
+    return first;
+  }
+
+  public final Node getLastChild()
+  {
+    // Create a child text node if necessary
+    if (last == null)
+      {
+        length = 0;
+        Node text = owner.createTextNode((value == null) ? "" : value);
+        appendChild(text);
+      }
+    return last;
+  }
+
+  public Node item(int index)
+  {
+    // Create a child text node if necessary
+    if (first == null)
+      {
+        length = 0;
+        Node text = owner.createTextNode((value == null) ? "" : value);
+        appendChild(text);
+      }
+    return super.item(index);
+  }
+
+  /**
+   * <b>DOM L2</b>
+   * Returns the element with which this attribute is associated.
+   */
+  public final Element getOwnerElement()
+  {
+    return (Element) parent;
+  }
+
+  public final Node getNextSibling()
+  {
+    return null;
+  }
+
+  public final Node getPreviousSibling()
+  {
+    return null;
+  }
+
+  public Node getParentNode()
+  {
+    return null;
+  }
+
+  /**
+   * Records the element with which this attribute is associated.
+   */
+  public final void setOwnerElement(Element e)
+  {
+    if (parent != null)
+      {
+        throw new DomEx (DomEx.HIERARCHY_REQUEST_ERR);
+      }
+    if (!(e instanceof DomElement))
+      {
+        throw new DomEx(DomEx.WRONG_DOCUMENT_ERR);
+      }
+    parent = (DomElement) e;
+    depth = parent.depth + 1;
+  }
+
+  /**
+   * The base URI of an Attr is always <code>null</code>.
+   */
+  public final String getBaseURI()
+  {
+    return null;
+  }
+    
+  /**
+   * Shallow clone of the attribute, breaking all ties with any
+   * elements.
+   */
+  public Object clone()
+  {
+    DomAttr retval = (DomAttr) super.clone();
+    retval.specified = true;
+    return retval;
+  }
+    
+  private void mutating(String oldValue, String newValue, short why)
+  {
+    if (!reportMutations || parent == null)
+      {
+        return;
+      }
+    
+    // EVENT:  DOMAttrModified, target = parent,
+    //	prev/new values provided, also attr name
+    MutationEvent	event;
+    
+    event = (MutationEvent) createEvent ("MutationEvents");
+    event.initMutationEvent ("DOMAttrModified",
+                             true /* bubbles */, false /* nocancel */,
+                             null, oldValue, newValue, getNodeName (), why);
+    parent.dispatchEvent (event);
+  }
+
+  // DOM Level 3 methods
+  
+  public TypeInfo getSchemaTypeInfo()
+  {
+    if (parent != null)
+      {
+        // DTD implementation
+        DomDoctype doctype = (DomDoctype) parent.owner.getDoctype();
+        if (doctype != null)
+          {
+            return doctype.getAttributeTypeInfo(parent.getNodeName(),
+                                                getNodeName());
+          }
+        // TODO XML Schema implementation
+      }
+    return null;
+  }
+
+  public boolean isId()
+  {
+    if (parent != null)
+      {
+        DomDoctype doctype = (DomDoctype) parent.owner.getDoctype();
+        if (doctype != null)
+          {
+            DTDAttributeTypeInfo info =
+              doctype.getAttributeTypeInfo(parent.getNodeName(),
+                                           getNodeName());
+            if (info != null && "ID".equals(info.type))
+              {
+                return true;
+              }
+          }
+        DomElement element = (DomElement) parent;
+        if (element.userIdAttrs != null &&
+            element.userIdAttrs.contains(this))
+          {
+            return true;
+          }
+        // TODO XML Schema implementation
+      }
+    return false;
+  }
+
+}
+