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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/xml/xpath/FunctionCall.java | |
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Diffstat (limited to 'libjava/classpath/gnu/xml/xpath/FunctionCall.java')
-rw-r--r-- | libjava/classpath/gnu/xml/xpath/FunctionCall.java | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/xml/xpath/FunctionCall.java b/libjava/classpath/gnu/xml/xpath/FunctionCall.java new file mode 100644 index 000000000..977482a8f --- /dev/null +++ b/libjava/classpath/gnu/xml/xpath/FunctionCall.java @@ -0,0 +1,169 @@ +/* FunctionCall.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 gnu.java.lang.CPStringBuilder; + +import java.util.ArrayList; +import java.util.Collections; +import java.util.Iterator; +import java.util.List; +import javax.xml.namespace.QName; +import javax.xml.xpath.XPathFunction; +import javax.xml.xpath.XPathFunctionException; +import javax.xml.xpath.XPathFunctionResolver; +import org.w3c.dom.Node; + +/** + * Executes an XPath core or extension function. + * + * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> + */ +public final class FunctionCall + extends Expr +{ + + final XPathFunctionResolver resolver; + final String name; + final List<Expr> args; + + public FunctionCall(XPathFunctionResolver resolver, String name) + { + this(resolver, name, null); + } + + public FunctionCall(XPathFunctionResolver resolver, String name, List<Expr> args) + { + this.resolver = resolver; + this.name = name; + if (args == null) + this.args = Collections.emptyList(); + else + this.args = args; + } + + @Override + public Object evaluate(Node context, int pos, int len) + { + if (resolver != null) + { + QName qname = QName.valueOf(name); + int arity = args.size(); + XPathFunction function = resolver.resolveFunction(qname, arity); + if (function != null) + { + //System.err.println("Calling "+toString()+" with "+values); + if (function instanceof Expr) + { + if (function instanceof Function) + { + ((Function) function).setArguments(args); + } + return ((Expr) function).evaluate(context, pos, len); + } + else + { + List<Object> values = new ArrayList<Object>(arity); + for (int i = 0; i < arity; i++) + { + Expr arg = (Expr) args.get(i); + values.add(arg.evaluate(context, pos, len)); + } + try + { + return function.evaluate(values); + } + catch (XPathFunctionException e) + { + e.printStackTrace(System.err); // FIXME + throw new RuntimeException(e.getMessage(), e); + } + } + } + } + throw new IllegalArgumentException("Invalid function call: " + + toString()); + } + + public Expr clone(Object context) + { + int len = args.size(); + List<Expr> args2 = new ArrayList<Expr>(len); + for (int i = 0; i < len; i++) + { + args2.add(args.get(i).clone(context)); + } + XPathFunctionResolver r = resolver; + if (context instanceof XPathFunctionResolver) + { + r = (XPathFunctionResolver) context; + } + return new FunctionCall(r, name, args2); + } + + public boolean references(QName var) + { + for (Iterator<Expr> i = args.iterator(); i.hasNext(); ) + { + if (i.next().references(var)) + { + return true; + } + } + return false; + } + + public String toString() + { + CPStringBuilder buf = new CPStringBuilder(); + buf.append(name); + buf.append('('); + int len = args.size(); + for (int i = 0; i < len; i++) + { + if (i > 0) + { + buf.append(','); + } + buf.append(args.get(i)); + } + buf.append(')'); + return buf.toString(); + } + +} |