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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/StringFunction.java | |
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Diffstat (limited to 'libjava/classpath/gnu/xml/xpath/StringFunction.java')
-rw-r--r-- | libjava/classpath/gnu/xml/xpath/StringFunction.java | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/xml/xpath/StringFunction.java b/libjava/classpath/gnu/xml/xpath/StringFunction.java new file mode 100644 index 000000000..b2b3cecf7 --- /dev/null +++ b/libjava/classpath/gnu/xml/xpath/StringFunction.java @@ -0,0 +1,119 @@ +/* StringFunction.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.List; +import javax.xml.namespace.QName; +import org.w3c.dom.Node; + +/** + * The <code>string function converts an object to a string as follows: + * <ul> + * <li>A node-set is converted to a string by returning the string-value of + * the node in the node-set that is first in document order. If the node-set + * is empty, an empty string is returned.</li> + * <li>A number is converted to a string as follows + * <ul> + * <li>NaN is converted to the string NaN</li> + * <li>positive zero is converted to the string 0</li> + * <li>negative zero is converted to the string 0</li> + * <li>positive infinity is converted to the string Infinity</li> + * <li>negative infinity is converted to the string -Infinity</li> + * <li>if the number is an integer, the number is represented in decimal + * form as a Number with no decimal point and no leading zeros, preceded by + * a minus sign (-) if the number is negative</li> + * <li>otherwise, the number is represented in decimal form as a Number + * including a decimal point with at least one digit before the decimal + * point and at least one digit after the decimal point, preceded by a minus + * sign (-) if the number is negative; there must be no leading zeros before + * the decimal point apart possibly from the one required digit immediately + * before the decimal point; beyond the one required digit after the decimal + * point there must be as many, but only as many, more digits as are needed + * to uniquely distinguish the number from all other IEEE 754 numeric + * values.</li> + * </ul> + * </li> + * <li>The boolean false value is converted to the string false. The boolean + * true value is converted to the string true.</li> + * <li>An object of a type other than the four basic types is converted to a + * string in a way that is dependent on that type.</li> + * </ul> + * If the argument is omitted, it defaults to a node-set with the context + * node as its only member. + * + * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> + */ +final class StringFunction + extends Expr +{ + + final Expr arg; + + StringFunction(List<Expr> args) + { + this(args.size() > 0 ? args.get(0) : null); + } + + StringFunction(Expr arg) + { + this.arg = arg; + } + + public Object evaluate(Node context, int pos, int len) + { + Object val = (arg == null) ? null : arg.evaluate(context, pos, len); + return _string(context, val); + } + + public Expr clone(Object context) + { + return new StringFunction((arg == null) ? null : + arg.clone(context)); + } + + public boolean references(QName var) + { + return (arg == null) ? false : arg.references(var); + } + + public String toString() + { + return (arg == null) ? "string()" : "string(" + arg + ")"; + } + +} |