Source Code Cross Referenced for CompositeIterator.java in  » Web-Crawler » heritrix » org » archive » util » iterator » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Crawler » heritrix » org.archive.util.iterator 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* CompositeIterator
002:         *
003:         * $Id: CompositeIterator.java 4644 2006-09-20 22:40:21Z paul_jack $
004:         *
005:         * Created on Mar 3, 2004
006:         *
007:         * Copyright (C) 2004 Internet Archive.
008:         *
009:         * This file is part of the Heritrix web crawler (crawler.archive.org).
010:         *
011:         * Heritrix is free software; you can redistribute it and/or modify
012:         * it under the terms of the GNU Lesser Public License as published by
013:         * the Free Software Foundation; either version 2.1 of the License, or
014:         * any later version.
015:         *
016:         * Heritrix is distributed in the hope that it will be useful,
017:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
018:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
019:         * GNU Lesser Public License for more details.
020:         *
021:         * You should have received a copy of the GNU Lesser Public License
022:         * along with Heritrix; if not, write to the Free Software
023:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
024:         */
025:        package org.archive.util.iterator;
026:
027:        import java.util.ArrayList;
028:        import java.util.Iterator;
029:        import java.util.NoSuchElementException;
030:
031:        /**
032:         * An iterator that's built up out of any number of other iterators.
033:         * @author gojomo
034:         */
035:        public class CompositeIterator implements  Iterator {
036:            ArrayList<Iterator> iterators = new ArrayList<Iterator>();
037:            Iterator currentIterator;
038:            int indexOfCurrentIterator = -1;
039:
040:            /**
041:             * Moves to the next (non empty) iterator. Returns false if there are no
042:             * more (non empty) iterators, true otherwise.
043:             * @return false if there are no more (non empty) iterators, true otherwise.
044:             */
045:            private boolean nextIterator() {
046:                if (++indexOfCurrentIterator < iterators.size()) {
047:                    currentIterator = (Iterator) iterators
048:                            .get(indexOfCurrentIterator);
049:                    // If the new iterator was empty this will move us to the next one.
050:                    return hasNext();
051:                } else {
052:                    currentIterator = null;
053:                    return false;
054:                }
055:            }
056:
057:            /* (non-Javadoc)
058:             * @see java.util.Iterator#hasNext()
059:             */
060:            public boolean hasNext() {
061:                if (currentIterator != null && currentIterator.hasNext()) {
062:                    // Got more
063:                    return true;
064:                } else {
065:                    // Have got more if we can queue up a new iterator.
066:                    return nextIterator();
067:                }
068:            }
069:
070:            /* (non-Javadoc)
071:             * @see java.util.Iterator#next()
072:             */
073:            public Object next() {
074:                if (hasNext()) {
075:                    return currentIterator.next();
076:                } else {
077:                    throw new NoSuchElementException();
078:                }
079:            }
080:
081:            /* (non-Javadoc)
082:             * @see java.util.Iterator#remove()
083:             */
084:            public void remove() {
085:                throw new UnsupportedOperationException();
086:            }
087:
088:            /**
089:             * Create an empty CompositeIterator. Internal
090:             * iterators may be added later.
091:             */
092:            public CompositeIterator() {
093:                super ();
094:            }
095:
096:            /**
097:             * Convenience method for concatenating together
098:             * two iterators.
099:             * @param i1
100:             * @param i2
101:             */
102:            public CompositeIterator(Iterator i1, Iterator i2) {
103:                this ();
104:                add(i1);
105:                add(i2);
106:            }
107:
108:            /**
109:             * Add an iterator to the internal chain.
110:             *
111:             * @param i an iterator to add.
112:             */
113:            public void add(Iterator i) {
114:                iterators.add(i);
115:            }
116:
117:        }
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