| /* |
| * Copyright 2000-2014 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.openapi.diff.impl.string; |
| |
| import com.intellij.openapi.diff.impl.string.DiffString; |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.util.Arrays; |
| |
| public class DiffStringBuilder implements CharSequence { |
| @NotNull private char[] myData; |
| private int myLength; |
| |
| public DiffStringBuilder() { |
| this(16); |
| } |
| |
| public DiffStringBuilder(int len) { |
| myData = new char[len]; |
| myLength = 0; |
| } |
| |
| @Override |
| public int length() { |
| return myLength; |
| } |
| |
| @Override |
| public char charAt(int index) { |
| if (index < 0 || index >= myLength) { |
| throw new StringIndexOutOfBoundsException(index); |
| } |
| return myData[index]; |
| } |
| |
| @Override |
| @NotNull |
| public CharSequence subSequence(int start, int end) { |
| DiffString.checkBounds(start, end, myLength); |
| return DiffString.create(myData, start, end - start); |
| } |
| |
| @NotNull |
| public DiffString toDiffString() { |
| return DiffString.create(myData, 0, myLength); |
| } |
| |
| @Override |
| @NotNull |
| public String toString() { |
| return toDiffString().toString(); |
| } |
| |
| private void ensureCapacityInternal(int neededCapacity) { |
| if (neededCapacity > myData.length) { |
| int newCapacity = myData.length; |
| while (newCapacity < neededCapacity) newCapacity *= 2; |
| |
| myData = Arrays.copyOf(myData, newCapacity); |
| } |
| } |
| |
| public void append(@NotNull DiffString s) { |
| if (s.isEmpty()) return; |
| ensureCapacityInternal(myLength + s.length()); |
| s.copyData(myData, myLength); |
| myLength += s.length(); |
| } |
| } |