| /* |
| * Copyright 2000-2013 JetBrains s.r.o. |
| * |
| * 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 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 com.intellij.util.enumeration; |
| |
| import java.util.Enumeration; |
| import java.util.NoSuchElementException; |
| |
| public class SequenceEnumeration implements Enumeration { |
| private Enumeration myFirst; |
| private Enumeration mySecond; |
| private Enumeration myThird; |
| private Enumeration myCurrent; |
| private int myCurrentIndex; |
| |
| public SequenceEnumeration(Enumeration first, Enumeration second) { |
| this(first, second, null); |
| } |
| |
| public SequenceEnumeration(Enumeration first, Enumeration second, Enumeration third) { |
| myFirst = first; |
| mySecond = second; |
| myThird = third; |
| myCurrent = myFirst; |
| myCurrentIndex = 0; |
| } |
| |
| @Override |
| public boolean hasMoreElements() { |
| if (myCurrentIndex == 3) |
| return false; |
| if (myCurrent != null && myCurrent.hasMoreElements()) { |
| return true; |
| } |
| |
| if (myCurrentIndex == 0) { |
| myCurrent = mySecond; |
| } |
| else if (myCurrentIndex == 1) { |
| myCurrent = myThird; |
| } |
| myCurrentIndex++; |
| return hasMoreElements(); |
| } |
| |
| @Override |
| public Object nextElement() { |
| if (!hasMoreElements()) { |
| throw new NoSuchElementException(); |
| } |
| return myCurrent.nextElement(); |
| } |
| } |
| |