| /* FunctionAvailableFunction.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.transform; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.TreeSet; |
| import javax.xml.namespace.NamespaceContext; |
| import javax.xml.namespace.QName; |
| import javax.xml.xpath.XPathFunction; |
| import javax.xml.xpath.XPathFunctionException; |
| import org.w3c.dom.Node; |
| import gnu.xml.xpath.Expr; |
| import gnu.xml.xpath.Function; |
| |
| /** |
| * The XSLT <code>function-available</code> function. |
| * |
| * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> |
| */ |
| class FunctionAvailableFunction |
| extends Expr |
| implements Function, XPathFunction |
| { |
| |
| static final Collection xsltFunctions; |
| static final Collection xpathFunctions; |
| static |
| { |
| TreeSet acc = new TreeSet(); |
| acc.add("document"); |
| acc.add("key"); |
| acc.add("format-number"); |
| acc.add("current"); |
| acc.add("unparsed-entity-uri"); |
| acc.add("generate-id"); |
| acc.add("system-property"); |
| acc.add("element-available"); |
| acc.add("function-available"); |
| xsltFunctions = Collections.unmodifiableSet(acc); |
| acc = new TreeSet(); |
| acc.add("boolean"); |
| acc.add("ceiling"); |
| acc.add("concat"); |
| acc.add("contains"); |
| acc.add("count"); |
| acc.add("false"); |
| acc.add("floor"); |
| acc.add("id"); |
| acc.add("lang"); |
| acc.add("last"); |
| acc.add("local-name"); |
| acc.add("name"); |
| acc.add("namespace-uri"); |
| acc.add("normalize-space"); |
| acc.add("not"); |
| acc.add("number"); |
| acc.add("position"); |
| acc.add("round"); |
| acc.add("starts-with"); |
| acc.add("string"); |
| acc.add("string-length"); |
| acc.add("substring-after"); |
| acc.add("substring-before"); |
| acc.add("substring"); |
| acc.add("sum"); |
| acc.add("translate"); |
| acc.add("true"); |
| xpathFunctions = Collections.unmodifiableSet(acc); |
| } |
| |
| final NamespaceContext nsctx; |
| List args; |
| |
| FunctionAvailableFunction(NamespaceContext nsctx) |
| { |
| this.nsctx = nsctx; |
| } |
| |
| public Object evaluate(List args) |
| throws XPathFunctionException |
| { |
| // Useless... |
| return Collections.EMPTY_SET; |
| } |
| |
| public void setArguments(List args) |
| { |
| this.args = args; |
| } |
| |
| public Object evaluate(Node context, int pos, int len) |
| { |
| Expr arg = (Expr) args.get(0); |
| Object val = arg.evaluate(context, pos, len); |
| String name = _string(context, val); |
| String prefix, localName, uri; |
| int ci = name.indexOf(':'); |
| if (ci == -1) |
| { |
| prefix = null; |
| localName = name; |
| } |
| else |
| { |
| prefix = name.substring(0, ci); |
| localName = name.substring(ci + 1); |
| } |
| uri = nsctx.getNamespaceURI(prefix); |
| if (uri == null) |
| { |
| return (xpathFunctions.contains(localName) || |
| xsltFunctions.contains(localName)) ? |
| Boolean.TRUE : Boolean.FALSE; |
| } |
| else if (Stylesheet.XSL_NS.equals(uri)) |
| { |
| return xsltFunctions.contains(localName) ? |
| Boolean.TRUE : Boolean.FALSE; |
| } |
| // TODO extension functions |
| return Boolean.FALSE; |
| } |
| |
| public Expr clone(Object context) |
| { |
| NamespaceContext n = nsctx; |
| if (context instanceof NamespaceContext) |
| n = (NamespaceContext) context; |
| FunctionAvailableFunction f = new FunctionAvailableFunction(n); |
| int len = args.size(); |
| List args2 = new ArrayList(len); |
| for (int i = 0; i < len; i++) |
| args2.add(((Expr) args.get(i)).clone(context)); |
| f.setArguments(args2); |
| return f; |
| } |
| |
| public boolean references(QName var) |
| { |
| for (Iterator i = args.iterator(); i.hasNext(); ) |
| { |
| if (((Expr) i.next()).references(var)) |
| return true; |
| } |
| return false; |
| } |
| |
| public String toString() |
| { |
| return "function-available(" + args.get(0) + ")"; |
| } |
| |
| } |
| |