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Diffstat (limited to 'libjava/classpath/gnu/xml/dom/DomXPathResult.java')
| -rw-r--r-- | libjava/classpath/gnu/xml/dom/DomXPathResult.java | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/xml/dom/DomXPathResult.java b/libjava/classpath/gnu/xml/dom/DomXPathResult.java new file mode 100644 index 000000000..da8fcf513 --- /dev/null +++ b/libjava/classpath/gnu/xml/dom/DomXPathResult.java @@ -0,0 +1,233 @@ +/* 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)"; + } + } + +} |