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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/IdFunction.java | |
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Diffstat (limited to 'libjava/classpath/gnu/xml/xpath/IdFunction.java')
-rw-r--r-- | libjava/classpath/gnu/xml/xpath/IdFunction.java | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/xml/xpath/IdFunction.java b/libjava/classpath/gnu/xml/xpath/IdFunction.java new file mode 100644 index 000000000..7b6c6ac25 --- /dev/null +++ b/libjava/classpath/gnu/xml/xpath/IdFunction.java @@ -0,0 +1,103 @@ +/* IdFunction.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.util.Collection; +import java.util.List; +import javax.xml.namespace.QName; +import org.w3c.dom.Node; + +/** + * The <code>id</code> 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. + * + * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> + */ +public final class IdFunction + extends Pattern +{ + + final Expr arg; + + IdFunction(List<Expr> args) + { + this(args.get(0)); + } + + public IdFunction(Expr arg) + { + this.arg = arg; + } + + public boolean matches(Node context) + { + Object ret = evaluate(context, 1, 1); + return !((Collection<?>) ret).isEmpty(); + } + + @Override + public Object evaluate(Node context, int pos, int len) + { + Object val = arg.evaluate(context, pos, len); + return _id(context, val); + } + + public Expr clone(Object context) + { + return new IdFunction(arg.clone(context)); + } + + public boolean references(QName var) + { + return arg.references(var); + } + + public String toString() + { + return "id(" + arg + ")"; + } + +} |