| /* |
| * Copyright 2003-2008 Dave Griffith, Bas Leijdekkers |
| * |
| * 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.siyeh.ig.j2me; |
| |
| import com.intellij.psi.PsiExpression; |
| import com.intellij.psi.PsiLiteralExpression; |
| |
| class ShiftUtils { |
| |
| private ShiftUtils() { |
| super(); |
| } |
| |
| public static boolean isPowerOfTwo(PsiExpression rhs) { |
| if (!(rhs instanceof PsiLiteralExpression)) { |
| return false; |
| } |
| final PsiLiteralExpression literal = (PsiLiteralExpression)rhs; |
| final Object value = literal.getValue(); |
| if (!(value instanceof Number)) { |
| return false; |
| } |
| if (value instanceof Double || value instanceof Float) { |
| return false; |
| } |
| int intValue = ((Number)value).intValue(); |
| if (intValue <= 1) { |
| return false; |
| } |
| while (intValue % 2 == 0) { |
| intValue >>= 1; |
| } |
| return intValue == 1; |
| } |
| |
| public static int getLogBaseTwo(PsiLiteralExpression rhs) { |
| final Object value = rhs.getValue(); |
| int log = 0; |
| if (value == null) { |
| return log; |
| } |
| int intValue = ((Number)value).intValue(); |
| while (intValue % 2 == 0) { |
| intValue >>= 1; |
| log++; |
| } |
| return log; |
| } |
| } |