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+/* 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 ();
+ }
+}