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Diffstat (limited to 'libjava/gnu/xml/xpath/Expr.java')
| -rw-r--r-- | libjava/gnu/xml/xpath/Expr.java | 474 |
1 files changed, 0 insertions, 474 deletions
diff --git a/libjava/gnu/xml/xpath/Expr.java b/libjava/gnu/xml/xpath/Expr.java deleted file mode 100644 index 5957828522e..00000000000 --- a/libjava/gnu/xml/xpath/Expr.java +++ /dev/null @@ -1,474 +0,0 @@ -/* Expr.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.xpath; - -import java.io.IOException; -import java.text.DecimalFormat; -import java.text.DecimalFormatSymbols; -import java.util.ArrayList; -import java.util.Collection; -import java.util.Collections; -import java.util.Comparator; -import java.util.HashSet; -import java.util.Iterator; -import java.util.List; -import java.util.Locale; -import java.util.Set; -import java.util.StringTokenizer; -import javax.xml.namespace.QName; -import javax.xml.parsers.DocumentBuilder; -import javax.xml.parsers.DocumentBuilderFactory; -import javax.xml.parsers.ParserConfigurationException; -import javax.xml.xpath.XPathConstants; -import javax.xml.xpath.XPathExpression; -import javax.xml.xpath.XPathExpressionException; -import org.w3c.dom.Document; -import org.w3c.dom.Node; -import org.xml.sax.InputSource; -import org.xml.sax.SAXException; - -/** - * An XPath expression. - * This can be evaluated in the context of a node to produce a result. - * - * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> - */ -public abstract class Expr - implements XPathExpression -{ - - protected static final Comparator documentOrderComparator = - new DocumentOrderComparator(); - - protected static final DecimalFormat decimalFormat = - new DecimalFormat("####################################################" + - ".####################################################", - new DecimalFormatSymbols(Locale.US)); - - public Object evaluate(Object item, QName returnType) - throws XPathExpressionException - { - Object ret = null; - Node context = null; - if (item instanceof Node) - { - context = (Node) item; - ret = evaluate(context, 1, 1); - if (XPathConstants.STRING == returnType && - !(ret instanceof String)) - { - ret = _string(context, ret); - } - else if (XPathConstants.NUMBER == returnType && - !(ret instanceof Double)) - { - ret = new Double(_number(context, ret)); - } - else if (XPathConstants.BOOLEAN == returnType && - !(ret instanceof Boolean)) - { - ret = _boolean(context, ret) ? Boolean.TRUE : Boolean.FALSE; - } - else if (XPathConstants.NODE == returnType) - { - if (ret instanceof Collection) - { - Collection ns = (Collection) ret; - switch (ns.size()) - { - case 0: - ret = null; - break; - case 1: - ret = (Node) ns.iterator().next(); - break; - default: - throw new XPathExpressionException("multiple nodes in node-set"); - } - } - else if (ret != null) - { - throw new XPathExpressionException("return value is not a node-set"); - } - } - else if (XPathConstants.NODESET == returnType) - { - if (ret != null && !(ret instanceof Collection)) - { - throw new XPathExpressionException("return value is not a node-set"); - } - } - } - return ret; - } - - public String evaluate(Object item) - throws XPathExpressionException - { - return (String) evaluate(item, XPathConstants.STRING); - } - - public Object evaluate(InputSource source, QName returnType) - throws XPathExpressionException - { - try - { - DocumentBuilderFactory factory = - new gnu.xml.dom.JAXPFactory(); - DocumentBuilder builder = factory.newDocumentBuilder(); - Document doc = builder.parse(source); - return evaluate(doc, returnType); - } - catch (ParserConfigurationException e) - { - throw new XPathExpressionException(e); - } - catch (SAXException e) - { - throw new XPathExpressionException(e); - } - catch (IOException e) - { - throw new XPathExpressionException(e); - } - } - - public String evaluate(InputSource source) - throws XPathExpressionException - { - return (String) evaluate(source, XPathConstants.STRING); - } - - public abstract Object evaluate(Node context, int pos, int len); - - public abstract Expr clone(Object context); - - /* -- 4.1 Node Set Functions -- */ - - /** - * The id function selects elements by their unique ID. - * When the argument to id is of type node-set, then the result is - * the union of the result of applying id to the string-value of each of - * the nodes in the argument node-set. When the argument to id is of any - * other type, the argument is converted to a string as if by a call to - * the string function; the string is split into a whitespace-separated - * list of tokens (whitespace is any sequence of characters matching the - * production S); the result is a node-set containing the elements in the - * same document as the context node that have a unique ID equal to any of - * the tokens in the list. - */ - public static Collection _id(Node context, Object object) - { - Set ret = new HashSet(); - if (object instanceof Collection) - { - Collection nodeSet = (Collection) object; - for (Iterator i = nodeSet.iterator(); i.hasNext(); ) - { - String string = stringValue((Node) i.next()); - ret.addAll(_id (context, string)); - } - } - else - { - Document doc = (context instanceof Document) ? (Document) context : - context.getOwnerDocument(); - String string = _string(context, object); - StringTokenizer st = new StringTokenizer(string, " \t\r\n"); - while (st.hasMoreTokens()) - { - Node element = doc.getElementById(st.nextToken()); - if (element != null) - { - ret.add(element); - } - } - } - return ret; - } - - /** - * The local-name function returns the local part of the expanded-name of - * the node in the argument node-set that is first in document order. If - * the argument node-set is empty or the first node has no expanded-name, - * an empty string is returned. If the argument is omitted, it defaults to - * a node-set with the context node as its only member. - */ - public static String _local_name(Node context, Collection nodeSet) - { - Node node = (nodeSet == null || nodeSet.size() == 0) ? context : - firstNode(nodeSet); - return node.getLocalName(); - } - - /** - * The namespace-uri function returns the namespace URI of the - * expanded-name of the node in the argument node-set that is first in - * document order. If the argument node-set is empty, the first node has - * no expanded-name, or the namespace URI of the expanded-name is null, an - * empty string is returned. If the argument is omitted, it defaults to a - * node-set with the context node as its only member. - */ - public static String _namespace_uri(Node context, Collection nodeSet) - { - Node node = (nodeSet == null || nodeSet.size() == 0) ? context : - firstNode(nodeSet); - return node.getNamespaceURI(); - } - - /** - * The name function returns a string containing a QName representing the - * expanded-name of the node in the argument node-set that is first in - * document order. The QName must represent the expanded-name with respect - * to the namespace declarations in effect on the node whose expanded-name - * is being represented. Typically, this will be the QName that occurred - * in the XML source. This need not be the case if there are namespace - * declarations in effect on the node that associate multiple prefixes - * with the same namespace. However, an implementation may include - * information about the original prefix in its representation of nodes; - * in this case, an implementation can ensure that the returned string is - * always the same as the QName used in the XML source. If the argument - * node-set is empty or the first node has no expanded-name, an empty - * string is returned. If the argument it omitted, it defaults to a - * node-set with the context node as its only member. - */ - public static String _name(Node context, Collection nodeSet) - { - Node node = (nodeSet == null || nodeSet.size() == 0) ? context : - firstNode(nodeSet); - switch (node.getNodeType()) - { - case Node.ATTRIBUTE_NODE: - case Node.ELEMENT_NODE: - case Node.PROCESSING_INSTRUCTION_NODE: - return node.getNodeName(); - default: - return ""; - } - } - - /** - * Returns the first node in the set in document order. - */ - static Node firstNode(Collection nodeSet) - { - List list = new ArrayList(nodeSet); - Collections.sort(list, documentOrderComparator); - return (Node) list.get(0); - } - - /* -- 4.2 String Functions -- */ - - /** - * Implementation of the XPath <code>string</code> function. - */ - public static String _string(Node context, Object object) - { - if (object == null) - { - return stringValue(context); - } - if (object instanceof String) - { - return (String) object; - } - if (object instanceof Boolean) - { - return object.toString(); - } - if (object instanceof Double) - { - double d = ((Double) object).doubleValue(); - if (Double.isNaN(d)) - { - return "NaN"; - } - else if (d == 0.0d) - { - return "0"; - } - else if (Double.isInfinite(d)) - { - if (d < 0) - { - return "-Infinity"; - } - else - { - return "Infinity"; - } - } - else - { - String ret = decimalFormat.format(d); - if (ret.endsWith (".0")) - { - ret = ret.substring(0, ret.length() - 2); - } - return ret; - } - } - if (object instanceof Collection) - { - Collection nodeSet = (Collection) object; - if (nodeSet.isEmpty()) - { - return ""; - } - Node node = firstNode(nodeSet); - return stringValue(node); - } - throw new IllegalArgumentException(object.toString()); - } - - /* -- 4.3 Boolean Functions -- */ - - /** - * Implementation of the XPath <code>boolean</code> function. - */ - public static boolean _boolean(Node context, Object object) - { - if (object instanceof Boolean) - { - return ((Boolean) object).booleanValue(); - } - if (object instanceof Double) - { - return ((Double) object).doubleValue() != 0.0; - } - if (object instanceof String) - { - return ((String) object).length() != 0; - } - if (object instanceof Collection) - { - return ((Collection) object).size() != 0; - } - return false; // TODO user defined types - } - - /* -- 4.4 Number Functions -- */ - - /** - * Implementation of the XPath <code>number</code> function. - */ - public static double _number(Node context, Object object) - { - if (object == null) - { - object = Collections.singleton(context); - } - if (object instanceof Double) - { - return ((Double) object).doubleValue(); - } - if (object instanceof Boolean) - { - return ((Boolean) object).booleanValue() ? 1.0 : 0.0; - } - if (object instanceof Collection) - { - // Convert node-set to string - object = stringValue((Collection) object); - } - if (object instanceof String) - { - String string = ((String) object).trim(); - try - { - return Double.parseDouble(string); - } - catch (NumberFormatException e) - { - return Double.NaN; - } - } - return Double.NaN; // TODO user-defined types - } - - /** - * Computes the XPath string-value of the specified node-set. - */ - public static String stringValue(Collection nodeSet) - { - StringBuffer buf = new StringBuffer(); - for (Iterator i = nodeSet.iterator(); i.hasNext(); ) - { - buf.append(stringValue((Node) i.next())); - } - return buf.toString(); - } - - /** - * Computes the XPath string-value of the specified node. - */ - public static String stringValue(Node node) - { - return stringValue(node, false); - } - - static String stringValue(Node node, boolean elementMode) - { - switch (node.getNodeType()) - { - case Node.DOCUMENT_NODE: // 5.1 Root Node - case Node.DOCUMENT_FRAGMENT_NODE: - case Node.ELEMENT_NODE: // 5.2 Element Nodes - StringBuffer buf = new StringBuffer(); - for (Node ctx = node.getFirstChild(); ctx != null; - ctx = ctx.getNextSibling()) - { - buf.append(stringValue(ctx, true)); - } - return buf.toString(); - case Node.TEXT_NODE: // 5.7 Text Nodes - case Node.CDATA_SECTION_NODE: - return node.getNodeValue(); - case Node.ATTRIBUTE_NODE: // 5.3 Attribute Nodes - case Node.PROCESSING_INSTRUCTION_NODE: // 5.5 Processing Instruction - case Node.COMMENT_NODE: // 5.6 Comment Nodes - if (!elementMode) - { - return node.getNodeValue(); - } - default: - return ""; - } - } - -} |