| /* |
| * 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 SubstringAfterCharacterIterator implements ICharacterIterator { |
| private ICharacterIterator searchIterator; |
| private final UTF8StringCharacterIterator stringIterator; |
| private boolean found = false; |
| |
| public SubstringAfterCharacterIterator(UTF8StringCharacterIterator stringIterator) { |
| this.stringIterator = stringIterator; |
| } |
| |
| public void setSearch(ICharacterIterator searchIterator) { |
| this.searchIterator = searchIterator; |
| } |
| |
| @Override |
| public char next() { |
| int c1 = ICharacterIterator.EOS_CHAR; |
| if (!found) { |
| searchIterator.reset(); |
| int currentByteOffset = 0; |
| boolean firstPass = true; |
| while (true) { |
| c1 = stringIterator.next(); |
| int c2 = searchIterator.next(); |
| if (firstPass) { |
| // Save character and location for next call. |
| currentByteOffset = stringIterator.getByteOffset(); |
| firstPass = false; |
| } |
| if (c2 == ICharacterIterator.EOS_CHAR) { |
| // End of search string. Found the substring. |
| found = true; |
| break; |
| } |
| if (c1 == ICharacterIterator.EOS_CHAR) { |
| // End of string. Stop. |
| return (char) 0; |
| } |
| if (c1 != c2) { |
| // No match found. Move the next character. |
| searchIterator.reset(); |
| stringIterator.setByteOffset(currentByteOffset); |
| firstPass = true; |
| } |
| } |
| } |
| |
| if (c1 != ICharacterIterator.EOS_CHAR) { |
| return (char) c1; |
| } |
| return stringIterator.next(); |
| } |
| |
| @Override |
| public void reset() { |
| stringIterator.reset(); |
| } |
| } |