Source Code Cross Referenced for ReadOnlyIterator.java in  » Report » pentaho-report » org » jfree » report » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Report » pentaho report » org.jfree.report.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /**
02:         * ===========================================
03:         * JFreeReport : a free Java reporting library
04:         * ===========================================
05:         *
06:         * Project Info:  http://reporting.pentaho.org/
07:         *
08:         * (C) Copyright 2001-2007, by Object Refinery Ltd, Pentaho Corporation and Contributors.
09:         *
10:         * This library is free software; you can redistribute it and/or modify it under the terms
11:         * of the GNU Lesser General Public License as published by the Free Software Foundation;
12:         * either version 2.1 of the License, or (at your option) any later version.
13:         *
14:         * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
15:         * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
16:         * See the GNU Lesser General Public License for more details.
17:         *
18:         * You should have received a copy of the GNU Lesser General Public License along with this
19:         * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20:         * Boston, MA 02111-1307, USA.
21:         *
22:         * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
23:         * in the United States and other countries.]
24:         *
25:         * ------------
26:         * ReadOnlyIterator.java
27:         * ------------
28:         * (C) Copyright 2001-2007, by Object Refinery Ltd, Pentaho Corporation and Contributors.
29:         */package org.jfree.report.util;
30:
31:        import java.util.Iterator;
32:
33:        /**
34:         * A unmodifiable iterator wrapper.
35:         *
36:         * @author Thomas Morgner
37:         */
38:        public class ReadOnlyIterator implements  Iterator {
39:            /**
40:             * The base iterator.
41:             */
42:            private final Iterator base;
43:
44:            /**
45:             * Creates a read-only iterator.
46:             *
47:             * @param base the base iterator.
48:             */
49:            public ReadOnlyIterator(final Iterator base) {
50:                this .base = base;
51:            }
52:
53:            /**
54:             * Returns <tt>true</tt> if the iteration has more elements. (In other words, returns
55:             * <tt>true</tt> if <tt>next</tt> would return an element rather than throwing an
56:             * exception.)
57:             *
58:             * @return <tt>true</tt> if the iterator has more elements.
59:             */
60:            public boolean hasNext() {
61:                return base.hasNext();
62:            }
63:
64:            /**
65:             * Returns the next element in the iteration.
66:             *
67:             * @return the next element in the iteration.
68:             */
69:            public Object next() {
70:                return base.next();
71:            }
72:
73:            /**
74:             * Removes from the underlying collection the last element returned by the iterator
75:             * (optional operation).  This method can be called only once per call to <tt>next</tt>.
76:             *  The behavior of an iterator is unspecified if the underlying collection is modified
77:             * while the iteration is in progress in any way other than by calling this method.
78:             *
79:             * @throws UnsupportedOperationException if the <tt>remove</tt> operation is not
80:             *                                       supported by this Iterator.
81:             * @throws IllegalStateException         if the <tt>next</tt> method has not yet been
82:             *                                       called, or the <tt>remove</tt> method has
83:             *                                       already been called after the last call to the
84:             *                                       <tt>next</tt> method.
85:             */
86:            public void remove() {
87:                throw new UnsupportedOperationException();
88:            }
89:        }
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