| /* |
| * Copyright 2009 Google Inc. |
| * |
| * 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.google.gwt.core.ext.linker.impl; |
| |
| import com.google.gwt.core.ext.linker.StatementRanges; |
| import com.google.gwt.thirdparty.guava.common.annotations.VisibleForTesting; |
| import com.google.gwt.thirdparty.guava.common.collect.Lists; |
| import com.google.gwt.thirdparty.guava.common.primitives.Ints; |
| |
| import java.io.Serializable; |
| import java.util.List; |
| |
| /** |
| * The standard implementation of {@link StatementRanges}. |
| */ |
| public class StandardStatementRanges implements StatementRanges, Serializable { |
| |
| /** |
| * Combines multiple StatementRanges into a single StatementRanges by assuming |
| * that the offsets inside each subsequent StatementRanges instance begin |
| * after the ending offset of the previous instance. |
| */ |
| public static StatementRanges combine(List<StatementRanges> statementRangesList) { |
| List<Integer> combinedStarts = Lists.newArrayList(); |
| List<Integer> combinedEnds = Lists.newArrayList(); |
| |
| int lastEndingOffset = 0; |
| for (StatementRanges statementRanges : statementRangesList) { |
| // Append all the start and end indexes + the current offset. |
| for (int i = 0; i < statementRanges.numStatements(); i++) { |
| combinedStarts.add(lastEndingOffset + statementRanges.start(i)); |
| combinedEnds.add(lastEndingOffset + statementRanges.end(i)); |
| } |
| // Move the offset forward to the end of the just finished StatementRanges |
| // instance. |
| if (statementRanges.numStatements() > 0) { |
| lastEndingOffset += statementRanges.end(statementRanges.numStatements() - 1); |
| } |
| } |
| |
| return new StandardStatementRanges(combinedStarts, combinedEnds); |
| } |
| |
| @VisibleForTesting |
| final int[] ends; |
| final int[] starts; |
| |
| public StandardStatementRanges(List<Integer> starts, List<Integer> ends) { |
| assert starts.size() == ends.size(); |
| this.starts = Ints.toArray(starts); |
| this.ends = Ints.toArray(ends); |
| } |
| |
| @Override |
| public int end(int i) { |
| return ends[i]; |
| } |
| |
| @Override |
| public int numStatements() { |
| return starts.length; |
| } |
| |
| @Override |
| public int start(int i) { |
| return starts[i]; |
| } |
| } |