1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 /* $Id: NullCharIterator.java 1617052 2014-08-10 06:55:01Z gadams $ */ 19 20 package org.apache.fop.fo; 21 22 import java.util.NoSuchElementException; 23 24 /** 25 * Class providing an iterator for zero characters. Used by the Block FO. 26 */ 27 public class NullCharIterator extends CharIterator { 28 29 private static CharIterator instance = new NullCharIterator(); 30 31 /** 32 * Obtain the singleton instance of the null character iterator. 33 * @return the char iterator 34 */ getInstance()35 public static CharIterator getInstance() { 36 return instance; 37 } 38 39 /** 40 * Constructor 41 */ NullCharIterator()42 public NullCharIterator() { 43 //nop 44 } 45 46 /** {@inheritDoc} */ hasNext()47 public boolean hasNext() { 48 return false; 49 } 50 51 /** {@inheritDoc} */ nextChar()52 public char nextChar() throws NoSuchElementException { 53 throw new NoSuchElementException(); 54 } 55 56 } 57 58