| /* |
| * Copyright 2009-2011 by The Regents of the University of California |
| * Licensed 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 from |
| * |
| * 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 edu.uci.ics.asterix.om.base.temporal; |
| |
| import edu.uci.ics.asterix.om.base.AMutableDuration; |
| |
| public class ADurationParser { |
| |
| private enum State { |
| NOTHING_READ, |
| YEAR, |
| MONTH, |
| DAY, |
| TIME, |
| HOUR, |
| MIN, |
| MILLISEC, |
| SEC; |
| }; |
| |
| private static final String errorMessage = "This can not be an instance of duration"; |
| |
| public static <T> void parse(ICharSequenceAccessor<T> charAccessor, AMutableDuration aDuration) throws Exception { |
| |
| boolean positive = true; |
| int offset = 0; |
| int value = 0, hour = 0, minute = 0, second = 0, millisecond = 0, year = 0, month = 0, day = 0; |
| State state = State.NOTHING_READ; |
| |
| if (charAccessor.getCharAt(offset) == '-') { |
| offset++; |
| positive = false; |
| } |
| |
| if (charAccessor.getCharAt(offset++) != 'P') { |
| throw new Exception(errorMessage); |
| } |
| |
| for (; offset < charAccessor.getLength(); offset++) { |
| if (charAccessor.getCharAt(offset) >= '0' && charAccessor.getCharAt(offset) <= '9') { |
| // accumulate the digit fields |
| value = value * 10 + charAccessor.getCharAt(offset) - '0'; |
| } else { |
| switch (charAccessor.getCharAt(offset)) { |
| case 'Y': |
| if (state.compareTo(State.YEAR) < 0) { |
| year = value; |
| state = State.YEAR; |
| } else { |
| throw new Exception(errorMessage); |
| } |
| break; |
| case 'M': |
| if (state.compareTo(State.TIME) < 0) { |
| if (state.compareTo(State.MONTH) < 0) { |
| month = value; |
| state = State.MONTH; |
| } else { |
| throw new Exception(errorMessage); |
| } |
| } else if (state.compareTo(State.MIN) < 0) { |
| minute = value; |
| state = State.MIN; |
| } else { |
| throw new Exception(errorMessage); |
| } |
| break; |
| case 'D': |
| if (state.compareTo(State.DAY) < 0) { |
| day = value; |
| state = State.DAY; |
| } else { |
| throw new Exception(errorMessage); |
| } |
| break; |
| case 'T': |
| if (state.compareTo(State.TIME) < 0) { |
| state = State.TIME; |
| } else { |
| throw new Exception(errorMessage); |
| } |
| break; |
| |
| case 'H': |
| if (state.compareTo(State.HOUR) < 0) { |
| hour = value; |
| state = State.HOUR; |
| } else { |
| throw new Exception(errorMessage); |
| } |
| break; |
| case '.': |
| if (state.compareTo(State.MILLISEC) < 0) { |
| int i = 1; |
| for (; offset + i < charAccessor.getLength(); i++) { |
| if (charAccessor.getCharAt(offset + i) >= '0' |
| && charAccessor.getCharAt(offset + i) <= '9') { |
| if (i < 4) { |
| millisecond = millisecond * 10 + (charAccessor.getCharAt(offset + i) - '0'); |
| } else { |
| throw new Exception(errorMessage); |
| } |
| } else { |
| break; |
| } |
| } |
| offset += i; |
| state = State.MILLISEC; |
| } else { |
| throw new Exception(errorMessage); |
| } |
| case 'S': |
| if (state.compareTo(State.SEC) < 0) { |
| second = value; |
| state = State.SEC; |
| } else { |
| throw new Exception(errorMessage); |
| } |
| break; |
| default: |
| throw new Exception(errorMessage); |
| |
| } |
| value = 0; |
| } |
| } |
| |
| if (state.compareTo(State.TIME) == 0) { |
| throw new Exception(errorMessage); |
| } |
| |
| short temp = 1; |
| if (!positive) { |
| temp = -1; |
| } |
| |
| aDuration.setValue(temp * (year * 12 + month), temp |
| * (day * 24 * 3600 * 1000L + 3600 * 1000L * hour + 60 * minute * 1000L + second * 1000L + millisecond)); |
| |
| } |
| } |