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+/* AttributedStringIterator.java -- Class to iterate over AttributedString
+ Copyright (C) 1998, 1999 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., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+As a special exception, if you link this library with other files to
+produce an executable, this library does not by itself cause the
+resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why the
+executable file might be covered by the GNU General Public License. */
+
+
+package java.text;
+
+import java.util.Set;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.HashMap;
+import java.util.Iterator;
+
+/**
+ * This class implements the AttributedCharacterIterator interface. It
+ * is used by AttributedString.getIterator().
+ *
+ * @version 0.0
+ *
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ */
+class AttributedStringIterator implements AttributedCharacterIterator
+{
+
+/*************************************************************************/
+
+/**
+ * Instance Variables
+ */
+
+/**
+ * The character iterator containing the text
+ */
+private CharacterIterator ci;
+
+/**
+ * The list of attributes and ranges
+ */
+private AttributedString.AttributeRange[] attribs;
+
+/**
+ * The list of attributes that the user is interested in. We may,
+ * at our option, not return any other attributes.
+ */
+private AttributedCharacterIterator.Attribute[] restricts;
+
+/*************************************************************************/
+
+/*
+ * Constructors
+ */
+
+AttributedStringIterator(StringCharacterIterator sci,
+ AttributedString.AttributeRange[] attribs,
+ int begin_index, int end_index,
+ AttributedCharacterIterator.Attribute[] restricts)
+{
+ this.ci = new StringCharacterIterator(sci, begin_index, end_index);
+ this.attribs = attribs;
+ this.restricts = restricts;
+}
+
+/*************************************************************************/
+
+/*
+ * Instance Methods
+ */
+
+// First we have a bunch of stupid redirects. If StringCharacterIterator
+// weren't final, I just would have extended that for this class. Alas, no.
+
+public Object
+clone()
+{
+ return(ci.clone());
+}
+
+public char
+current()
+{
+ return(ci.current());
+}
+
+public char
+next()
+{
+ return(ci.next());
+}
+
+public char
+previous()
+{
+ return(ci.previous());
+}
+
+public char
+first()
+{
+ return(ci.first());
+}
+
+public char
+last()
+{
+ return(ci.last());
+}
+
+public int
+getIndex()
+{
+ return(ci.getIndex());
+}
+
+public char
+setIndex(int index)
+{
+ return(ci.setIndex(index));
+}
+
+public int
+getBeginIndex()
+{
+ return(ci.getBeginIndex());
+}
+
+public int
+getEndIndex()
+{
+ return(ci.getEndIndex());
+}
+
+/*
+ * Here is where the AttributedCharacterIterator methods start.
+ */
+
+/*************************************************************************/
+
+/**
+ * Returns a list of all the attribute keys that are defined anywhere
+ * on this string.
+ */
+public Set
+getAllAttributeKeys()
+{
+ HashSet s = new HashSet();
+ if (attribs == null)
+ return(s);
+
+ for (int i = 0; i < attribs.length; i++)
+ {
+ Set key_set = attribs[i].attribs.keySet();
+ Iterator iter = key_set.iterator();
+ while (iter.hasNext())
+ {
+ s.add(iter.next());
+ }
+ }
+
+ return(s);
+}
+
+/*************************************************************************/
+
+/**
+ * Various methods that determine how far the run extends for various
+ * attribute combinations.
+ */
+
+public int
+getRunLimit()
+{
+ return(getRunLimit(getAttributes().keySet()));
+}
+
+public int
+getRunLimit(AttributedCharacterIterator.Attribute attrib)
+{
+ HashSet s = new HashSet();
+ s.add(attrib);
+
+ return(getRunLimit(s));
+}
+
+public synchronized int
+getRunLimit(Set attribute_set)
+{
+ int orig_index = ci.getIndex();
+ int run_limit;
+
+ do
+ {
+ run_limit = ci.getIndex();
+
+ Map attribute_map = getAttributes();
+
+ boolean found = false;
+ Iterator iter = attribute_set.iterator();
+ while(iter.hasNext())
+ if (!attribute_map.containsKey(iter.next()))
+ {
+ found = true;
+ break;
+ }
+
+ if (found)
+ break;
+ }
+ while (ci.next() != CharacterIterator.DONE);
+
+ boolean hit_end = (ci.previous() == CharacterIterator.DONE);
+
+ ci.setIndex(orig_index);
+
+ if (run_limit == orig_index)
+ return(-1); // No characters match the given attributes
+// else if (!hit_end)
+// --run_limit;
+
+ return(run_limit);
+}
+
+/*************************************************************************/
+
+/**
+ * Various methods that determine where the run begins for various
+ * attribute combinations.
+ */
+
+public int
+getRunStart()
+{
+ return(getRunStart(getAttributes().keySet()));
+}
+
+public int
+getRunStart(AttributedCharacterIterator.Attribute attrib)
+{
+ HashSet s = new HashSet();
+ s.add(attrib);
+
+ return(getRunStart(s));
+}
+
+public int
+getRunStart(Set attribute_set)
+{
+ int orig_index = ci.getIndex();
+ int run_start;
+
+ do
+ {
+ run_start = ci.getIndex();
+
+ Map attribute_map = getAttributes();
+
+ Iterator iter = attribute_set.iterator();
+ while(iter.hasNext())
+ if (!attribute_map.containsKey(iter.next()))
+ break;
+
+ if (iter.hasNext())
+ break;
+ }
+ while (ci.previous() != CharacterIterator.DONE);
+
+ boolean hit_beginning = (ci.previous() == CharacterIterator.DONE);
+
+ ci.setIndex(orig_index);
+
+ if (run_start == orig_index)
+ return(-1); // No characters match the given attributes
+ else if (!hit_beginning)
+ ++run_start;
+
+ return(run_start);
+}
+
+/*************************************************************************/
+
+public Object
+getAttribute(AttributedCharacterIterator.Attribute attrib)
+{
+ if (attribs == null)
+ return(null);
+
+ for (int i = 0; i < attribs.length; i++)
+ {
+ Set key_set = attribs[i].attribs.keySet();
+ Iterator iter = key_set.iterator();
+ while (iter.hasNext())
+ {
+ Object obj = iter.next();
+
+ // Check for attribute match and range match
+ if (obj.equals(attrib))
+ if ((ci.getIndex() >= attribs[i].begin_index) &&
+ (ci.getIndex() <= attribs[i].end_index))
+ return(attribs[i].attribs.get(obj));
+ }
+ }
+
+ return(null);
+}
+
+/*************************************************************************/
+
+/**
+ * Return a list of all the attributes and values defined for this
+ * character
+ */
+public Map
+getAttributes()
+{
+ HashMap m = new HashMap();
+ if (attribs == null)
+ return(m);
+
+ for (int i = 0; i < attribs.length; i++)
+ {
+ if ((ci.getIndex() >= attribs[i].begin_index) &&
+ (ci.getIndex() <= attribs[i].end_index))
+ m.putAll(attribs[i].attribs);
+ }
+
+ return(m);
+}
+
+} // class AttributedStringIterator
+