| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.vxquery.runtime.functions.strings; |
| |
| public class SubstringCharacterIterator implements ICharacterIterator { |
| private final ICharacterIterator in; |
| private int start; |
| private int length; |
| private int charOffset; |
| |
| public SubstringCharacterIterator(ICharacterIterator in) { |
| this.in = in; |
| } |
| |
| public void setBounds(int start, int length) { |
| this.start = start; |
| this.length = length; |
| } |
| |
| @Override |
| public char next() { |
| char c = in.next(); |
| // Only drill down if there is more to the string. |
| if (c == ICharacterIterator.EOS_CHAR) { |
| return c; |
| } else if (charOffset < start) { |
| ++charOffset; |
| return next(); |
| } else if (charOffset < start + length || length == Integer.MAX_VALUE) { |
| ++charOffset; |
| return c; |
| } |
| return (char) 0; |
| } |
| |
| @Override |
| public void reset() { |
| in.reset(); |
| charOffset = 1; |
| } |
| |
| } |