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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/java/util/regex/REMatchEnumeration.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/util/regex/REMatchEnumeration.java')
-rw-r--r-- | libjava/classpath/gnu/java/util/regex/REMatchEnumeration.java | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/util/regex/REMatchEnumeration.java b/libjava/classpath/gnu/java/util/regex/REMatchEnumeration.java new file mode 100644 index 000000000..04432d07c --- /dev/null +++ b/libjava/classpath/gnu/java/util/regex/REMatchEnumeration.java @@ -0,0 +1,141 @@ +/* gnu/regexp/REMatchEnumeration.java + Copyright (C) 1998-2001, 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.java.util.regex; + +import gnu.java.lang.CPStringBuilder; + +import java.io.Serializable; +import java.util.Enumeration; +import java.util.NoSuchElementException; + +/** + * An REMatchEnumeration enumerates regular expression matches over a + * given input text. You obtain a reference to an enumeration using + * the <code>getMatchEnumeration()</code> methods on an instance of + * RE. + * + * <P> + * + * REMatchEnumeration does lazy computation; that is, it will not + * search for a match until it needs to. If you'd rather just get all + * the matches at once in a big array, use the + * <code>getAllMatches()</code> methods on RE. However, using an + * enumeration can help speed performance when the entire text does + * not need to be searched immediately. + * + * <P> + * + * The enumerated type is especially useful when searching on a Reader + * or InputStream, because the InputStream read position cannot be + * guaranteed after calling <code>getMatch()</code> (see the + * description of that method for an explanation of why). Enumeration + * also saves a lot of overhead required when calling + * <code>getMatch()</code> multiple times. + * + * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A> + */ +public class REMatchEnumeration + implements Enumeration < REMatch >, Serializable +{ + private static final int YES = 1; + private static final int MAYBE = 0; + private static final int NO = -1; + + private int more; + private REMatch match; + private final RE expr; + private final CharIndexed input; + private final int eflags; + private int index; + + // Package scope constructor is used by RE.getMatchEnumeration() + REMatchEnumeration (RE expr, CharIndexed input, int index, int eflags) + { + more = MAYBE; + this.expr = expr; + this.input = input; + this.index = index; + this.eflags = eflags; + } + + /** Returns true if there are more matches in the input text. */ + public boolean hasMoreElements () + { + return hasMoreMatches (null); + } + + /** Returns true if there are more matches in the input text. */ + public boolean hasMoreMatches () + { + return hasMoreMatches (null); + } + + /** Returns true if there are more matches in the input text. + * Saves the text leading up to the match (or to the end of the input) + * in the specified buffer. + */ + public boolean hasMoreMatches (CPStringBuilder buffer) + { + if (more == MAYBE) + { + match = expr.getMatchImpl (input, index, eflags, buffer); + if (match != null) + { + input.move ((match.end[0] > 0) ? match.end[0] : 1); + + index = + (match.end[0] > 0) ? match.end[0] + match.offset : index + 1; + more = YES; + } + else + more = NO; + } + return (more == YES); + } + + /** Returns the next match in the input text. */ + public REMatch nextElement () throws NoSuchElementException + { + if (hasMoreElements ()) + { + more = (input.isValid ())? MAYBE : NO; + return match; + } + throw new NoSuchElementException (); + } +} |