| /* |
| * Copyright 2014 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.collect.Lists; |
| |
| import java.util.LinkedList; |
| |
| /** |
| * A builder for combining existing statement ranges. |
| * <p> |
| * Takes care of rebasing the offset of appended StatementRanges onto the end of the previously |
| * accumulated ranges. |
| */ |
| public class StatementRangesBuilder { |
| |
| private LinkedList<Integer> builderEndPositions = Lists.newLinkedList(); |
| private LinkedList<Integer> builderStartPositions = Lists.newLinkedList(); |
| |
| public void addEndPosition(Integer endPosition) { |
| builderEndPositions.add(endPosition); |
| } |
| |
| public void addStartPosition(Integer startPosition) { |
| builderStartPositions.add(startPosition); |
| } |
| |
| public void append(StatementRanges newStatementRanges) { |
| if (newStatementRanges.numStatements() == 0) { |
| return; |
| } |
| |
| int oldBaseOffset = newStatementRanges.start(0); |
| int newBaseOffset = builderEndPositions.isEmpty() ? 0 : builderEndPositions.getLast(); |
| int baseOffsetDelta = newBaseOffset - oldBaseOffset; |
| |
| for (int i = 0; i < newStatementRanges.numStatements(); i++) { |
| builderStartPositions.add(newStatementRanges.start(i) + baseOffsetDelta); |
| builderEndPositions.add(newStatementRanges.end(i) + baseOffsetDelta); |
| } |
| } |
| |
| public StatementRanges build() { |
| return new StandardStatementRanges(builderStartPositions, builderEndPositions); |
| } |
| } |