mirror of git://gcc.gnu.org/git/gcc.git
118 lines
3.5 KiB
Java
118 lines
3.5 KiB
Java
/* UnionExpr.java --
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Copyright (C) 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.xml.xpath;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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import javax.xml.namespace.QName;
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import org.w3c.dom.Node;
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/**
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* The union of two node-sets.
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*
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* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
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*/
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public final class UnionExpr
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extends Pattern
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{
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final Expr lhs;
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final Expr rhs;
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public UnionExpr(Expr lhs, Expr rhs)
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{
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this.lhs = lhs;
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this.rhs = rhs;
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}
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public boolean matches(Node context)
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{
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if (lhs instanceof Pattern && rhs instanceof Pattern)
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{
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return ((Pattern) lhs).matches(context) ||
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((Pattern) rhs).matches(context);
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}
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return false;
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}
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@Override
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public Object evaluate(Node context, int pos, int len)
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{
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Object left = lhs.evaluate(context, pos, len);
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Object right = rhs.evaluate(context, pos, len);
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List<Node> list;
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if (left instanceof Collection && right instanceof Collection)
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{
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Set<Node> set = new HashSet<Node>();
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/* Suppression is safe as addAll will check the types
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of the elements and throw a ClassCastException as necessary */
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@SuppressWarnings("unchecked")
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Collection<Node> l = (Collection<Node>) left;
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@SuppressWarnings("unchecked")
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Collection<Node> r = (Collection<Node>) right;
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set.addAll (l);
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set.addAll (r);
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list = new ArrayList<Node>(set);
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Collections.sort(list, documentOrderComparator);
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}
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else
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list = Collections.emptyList();
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return list;
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}
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public Expr clone(Object context)
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{
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return new UnionExpr(lhs.clone(context), rhs.clone(context));
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}
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public boolean references(QName var)
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{
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return (lhs.references(var) || rhs.references(var));
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}
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public String toString()
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{
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return lhs + " | " + rhs;
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}
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}
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