| /* DomXPathResult.java -- |
| Copyright (C) 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., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 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 java.util.Collection; |
| import java.util.Iterator; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.xpath.XPathException; |
| import org.w3c.dom.xpath.XPathResult; |
| |
| /** |
| * An XPath result object. |
| * |
| * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> |
| */ |
| class DomXPathResult |
| implements XPathResult |
| { |
| |
| final Object value; |
| final short type; |
| Iterator iterator; |
| |
| DomXPathResult (Object value, short requestedType) |
| { |
| this.value = value; |
| if (value instanceof Boolean) |
| { |
| type = XPathResult.BOOLEAN_TYPE; |
| } |
| else if (value instanceof Double) |
| { |
| type = XPathResult.NUMBER_TYPE; |
| } |
| else if (value instanceof String) |
| { |
| type = XPathResult.STRING_TYPE; |
| } |
| else if (value instanceof Collection) |
| { |
| Collection ns = (Collection) value; |
| switch (requestedType) |
| { |
| case XPathResult.ANY_TYPE: |
| case XPathResult.ANY_UNORDERED_NODE_TYPE: |
| type = (ns.size () == 1) ? XPathResult.FIRST_ORDERED_NODE_TYPE : |
| XPathResult.ORDERED_NODE_ITERATOR_TYPE; |
| break; |
| default: |
| type = requestedType; |
| } |
| iterator = ns.iterator (); |
| } |
| else |
| { |
| throw new IllegalArgumentException (); |
| } |
| } |
| |
| public boolean getBooleanValue() |
| { |
| if (type == XPathResult.BOOLEAN_TYPE) |
| { |
| return ((Boolean) value).booleanValue (); |
| } |
| throw new XPathException (XPathException.TYPE_ERR, value.toString ()); |
| } |
| |
| public boolean getInvalidIteratorState() |
| { |
| return iterator == null; |
| } |
| |
| public double getNumberValue() |
| { |
| if (type == XPathResult.NUMBER_TYPE) |
| { |
| return ((Double) value).doubleValue (); |
| } |
| throw new XPathException (XPathException.TYPE_ERR, value.toString ()); |
| } |
| |
| public short getResultType() |
| { |
| return type; |
| } |
| |
| public Node getSingleNodeValue() |
| { |
| switch (type) |
| { |
| case XPathResult.FIRST_ORDERED_NODE_TYPE: |
| case XPathResult.ORDERED_NODE_ITERATOR_TYPE: |
| case XPathResult.ORDERED_NODE_SNAPSHOT_TYPE: |
| case XPathResult.UNORDERED_NODE_ITERATOR_TYPE: |
| case XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE: |
| Collection ns = (Collection) value; |
| if (ns.isEmpty ()) |
| { |
| return null; |
| } |
| else |
| { |
| return (Node) ns.iterator ().next (); |
| } |
| } |
| throw new XPathException (XPathException.TYPE_ERR, value.toString ()); |
| } |
| |
| public int getSnapshotLength() |
| { |
| switch (type) |
| { |
| case XPathResult.FIRST_ORDERED_NODE_TYPE: |
| case XPathResult.ORDERED_NODE_ITERATOR_TYPE: |
| case XPathResult.ORDERED_NODE_SNAPSHOT_TYPE: |
| case XPathResult.UNORDERED_NODE_ITERATOR_TYPE: |
| case XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE: |
| return ((Collection) value).size (); |
| } |
| throw new XPathException (XPathException.TYPE_ERR, value.toString ()); |
| } |
| |
| public String getStringValue() |
| { |
| if (type == XPathResult.STRING_TYPE) |
| { |
| return (String) value; |
| } |
| throw new XPathException (XPathException.TYPE_ERR, value.toString ()); |
| } |
| |
| public Node iterateNext() |
| { |
| if (iterator != null) |
| { |
| if (iterator.hasNext ()) |
| { |
| return (Node) iterator.next (); |
| } |
| else |
| { |
| iterator = null; |
| return null; |
| } |
| } |
| throw new XPathException (XPathException.TYPE_ERR, value.toString ()); |
| } |
| |
| public Node snapshotItem(int index) |
| { |
| switch (type) |
| { |
| case XPathResult.FIRST_ORDERED_NODE_TYPE: |
| case XPathResult.ORDERED_NODE_ITERATOR_TYPE: |
| case XPathResult.ORDERED_NODE_SNAPSHOT_TYPE: |
| case XPathResult.UNORDERED_NODE_ITERATOR_TYPE: |
| case XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE: |
| Collection ns = (Collection) value; |
| Node[] nodes = new Node[ns.size ()]; |
| ns.toArray (nodes); |
| return nodes[index]; |
| } |
| throw new XPathException (XPathException.TYPE_ERR, value.toString ()); |
| } |
| |
| public String toString () |
| { |
| return getClass ().getName () + "[type=" + typeName (type) + ",value=" + |
| value + ']'; |
| } |
| |
| private String typeName (short type) |
| { |
| switch (type) |
| { |
| case XPathResult.BOOLEAN_TYPE: |
| return "BOOLEAN_TYPE"; |
| case XPathResult.NUMBER_TYPE: |
| return "NUMBER_TYPE"; |
| case XPathResult.STRING_TYPE: |
| return "STRING_TYPE"; |
| case XPathResult.FIRST_ORDERED_NODE_TYPE: |
| return "FIRST_ORDERED_NODE_TYPE"; |
| case XPathResult.ORDERED_NODE_ITERATOR_TYPE: |
| return "ORDERED_NODE_ITERATOR_TYPE"; |
| case XPathResult.ORDERED_NODE_SNAPSHOT_TYPE: |
| return "ORDERED_NODE_SNAPSHOT_TYPE"; |
| case XPathResult.UNORDERED_NODE_ITERATOR_TYPE: |
| return "UNORDERED_NODE_ITERATOR_TYPE"; |
| case XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE: |
| return "UNORDERED_NODE_SNAPSHOT_TYPE"; |
| default: |
| return "(unknown)"; |
| } |
| } |
| |
| } |