269 lines
8.4 KiB
Java
269 lines
8.4 KiB
Java
/* EqualityExpr.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.Collection;
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import java.util.Iterator;
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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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* Boolean equality expression.
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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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final class EqualityExpr
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extends Expr
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{
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final Expr lhs;
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final Expr rhs;
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final boolean invert;
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EqualityExpr(Expr lhs, Expr rhs, boolean invert)
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{
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this.lhs = lhs;
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this.rhs = rhs;
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this.invert = invert;
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}
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public Object evaluate(Node context, int pos, int len)
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{
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boolean val = evaluateImpl(context, pos, len);
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if (invert)
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{
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return val ? Boolean.FALSE : Boolean.TRUE;
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}
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else
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{
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return val ? Boolean.TRUE : Boolean.FALSE;
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}
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}
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private boolean evaluateImpl(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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/*
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* If both objects to be compared are node-sets, then the comparison
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* will be true if and only if there is a node in the first node-set and
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* a node in the second node-set such that the result of performing the
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* comparison on the string-values of the two nodes is true.
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*/
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boolean flns = left instanceof Collection;
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boolean frns = right instanceof Collection;
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if (flns && frns)
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{
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Collection lns = (Collection) left;
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Collection rns = (Collection) right;
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if (lns.isEmpty())
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{
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return false;
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}
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boolean all = true;
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for (Iterator i = lns.iterator(); i.hasNext(); )
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{
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Node ltest = (Node) i.next();
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for (Iterator j = rns.iterator(); j.hasNext(); )
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{
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Node rtest = (Node) j.next();
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if (ltest == rtest || ltest.equals(rtest))
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{
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// much shorter
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if (!invert)
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{
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return true;
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}
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}
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else if (stringValue(ltest).equals(stringValue(rtest)))
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{
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if (!invert)
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{
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return true;
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}
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}
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else
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{
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all = false;
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}
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}
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}
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return all;
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}
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/*
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* If one object to be compared is a node-set and the other is a number,
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* then the comparison will be true if and only if there is a node in
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* the node-set such that the result of performing the comparison on the
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* number to be compared and on the result of converting the
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* string-value of that node to a number using the number function is
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* true.
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*/
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boolean fln = left instanceof Double;
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boolean frn = right instanceof Double;
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if ((flns && frn) || (frns && fln))
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{
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Collection ns = flns ? (Collection) left : (Collection) right;
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double n = fln ? ((Double) left).doubleValue() :
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((Double) right).doubleValue();
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boolean all = true;
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for (Iterator i = ns.iterator(); i.hasNext(); )
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{
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Node test = (Node) i.next();
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double nn = _number(context, stringValue(test));
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if (nn == n)
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{
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if (!invert)
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{
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return true;
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}
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}
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else
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{
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all = false;
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}
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}
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return invert ? all : false;
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}
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/*
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* If one object to be compared is a node-set and the other is a
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* string, then the comparison will be true if and only if there is a
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* node in the node-set such that the result of performing the
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* comparison on the string-value of the node and the other string is
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* true.
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*/
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boolean fls = left instanceof String;
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boolean frs = right instanceof String;
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if ((flns && frs) || (frns && fls))
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{
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Collection ns = flns ? (Collection) left : (Collection) right;
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String s = fls ? (String) left : (String) right;
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boolean all = true;
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for (Iterator i = ns.iterator(); i.hasNext(); )
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{
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Node test = (Node) i.next();
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if (stringValue(test).equals(s))
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{
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if (!invert)
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{
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return true;
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}
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}
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else
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{
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all = false;
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}
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}
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return invert ? all : false;
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}
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/*
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* If one object to be compared is a node-set and the other is a
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* boolean, then the comparison will be true if and only if the result
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* of performing the comparison on the boolean and on the result of
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* converting the node-set to a boolean using the boolean function is
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* true.
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*/
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boolean flb = left instanceof Boolean;
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boolean frb = right instanceof Boolean;
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if ((flns && frb) || (frns && flb))
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{
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Collection ns = flns ? (Collection) left : (Collection) right;
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boolean b = flb ? ((Boolean) left).booleanValue() :
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((Boolean) right).booleanValue();
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return _boolean(context, ns) == b;
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}
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/*
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* If at least one object to be compared is a boolean, then each object
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* to be compared is converted to a boolean as if by applying the
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* boolean function.
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*/
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if (flb || frb)
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{
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boolean lb = flb ? ((Boolean) left).booleanValue() :
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_boolean(context, left);
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boolean rb = frb ? ((Boolean) right).booleanValue() :
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_boolean(context, right);
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return lb == rb;
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}
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/*
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* Otherwise, if at least one object to be compared is
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* a number, then each object to be compared is converted to a number as
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* if by applying the number function.
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*/
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if (fln || frn)
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{
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double ln = fln ? ((Double) left).doubleValue() :
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_number(context, left);
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double rn = frn ? ((Double) right).doubleValue() :
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_number(context, right);
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return ln == rn;
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}
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/*
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* Otherwise, both objects to be
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* compared are converted to strings as if by applying the string
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* function.
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*/
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String ls = fls ? (String) left : _string(context, left);
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String rs = frs ? (String) right : _string(context, right);
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return ls.equals(rs);
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}
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public Expr clone(Object context)
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{
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return new EqualityExpr(lhs.clone(context), rhs.clone(context), invert);
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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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if (invert)
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{
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return lhs + " != " + rhs;
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}
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else
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{
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return lhs + " = " + rhs;
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}
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}
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}
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