| /* |
| * Copyright 2000-2010 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.ex; |
| |
| import com.intellij.openapi.diff.impl.string.DiffString; |
| import com.intellij.openapi.diff.impl.string.DiffStringBuilder; |
| import com.intellij.openapi.util.text.StringUtil; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| import org.jetbrains.annotations.TestOnly; |
| |
| public class DiffFragment { |
| public static DiffFragment[] EMPTY_ARRAY = new DiffFragment[0]; |
| |
| @Nullable private CharSequence myText1; |
| @Nullable private CharSequence myText2; |
| private boolean myIsModified; |
| |
| @TestOnly |
| public DiffFragment(@Nullable String text1, @Nullable String text2) { |
| this(DiffString.createNullable(text1), DiffString.createNullable(text2)); |
| } |
| |
| public DiffFragment(@Nullable DiffString text1, @Nullable DiffString text2) { |
| myText1 = text1; |
| myText2 = text2; |
| myIsModified = (text1 == null || text2 == null || !text1.equals(text2)); |
| } |
| |
| public boolean isEmpty() { |
| return StringUtil.isEmpty(myText1) && StringUtil.isEmpty(myText2); |
| } |
| |
| /** |
| * Makes sense if both texts are not null |
| * @return true if both texts are considered modified, false otherwise |
| */ |
| public boolean isModified() { |
| return myIsModified; |
| } |
| |
| public void setModified(boolean modified) { |
| myIsModified = modified; |
| } |
| |
| public void appendText1(@Nullable DiffString str) { |
| if (str == null) return; |
| if (myText1 instanceof DiffStringBuilder) { |
| ((DiffStringBuilder)myText1).append(str); |
| return; |
| } |
| |
| if (myText1 instanceof DiffString) { |
| DiffString text1 = (DiffString)myText1; |
| if (DiffString.canInplaceConcatenate(text1, str)) { |
| myText1 = DiffString.concatenate(text1, str); |
| } |
| else { |
| DiffStringBuilder builder = new DiffStringBuilder(text1.length() + str.length()); |
| builder.append(text1); |
| builder.append(str); |
| myText1 = builder; |
| } |
| return; |
| } |
| |
| throw new IllegalStateException("Bad DiffFragment: " + (myText1 != null ? myText1.getClass() : "null")); |
| } |
| |
| public void appendText2(@Nullable DiffString str) { |
| if (str == null) return; |
| if (myText2 instanceof DiffStringBuilder) { |
| ((DiffStringBuilder)myText2).append(str); |
| return; |
| } |
| |
| if (myText2 instanceof DiffString) { |
| DiffString text2 = (DiffString)myText2; |
| if (DiffString.canInplaceConcatenate(text2, str)) { |
| myText2 = DiffString.concatenate(text2, str); |
| } |
| else { |
| DiffStringBuilder builder = new DiffStringBuilder(text2.length() + str.length()); |
| builder.append(text2); |
| builder.append(str); |
| myText2 = builder; |
| } |
| return; |
| } |
| |
| throw new IllegalStateException("Bad DiffFragment: " + (myText2 != null ? myText2.getClass() : "null")); |
| } |
| |
| @Nullable |
| public DiffString getText1() { |
| if (myText1 == null) return null; |
| if (myText1 instanceof DiffString) return (DiffString)myText1; |
| if (myText1 instanceof DiffStringBuilder) return ((DiffStringBuilder)myText1).toDiffString(); |
| |
| throw new IllegalStateException("Bad DiffFragment: " + myText1.getClass()); |
| } |
| |
| @Nullable |
| public DiffString getText2() { |
| if (myText2 == null) return null; |
| if (myText2 instanceof DiffString) return (DiffString)myText2; |
| if (myText2 instanceof DiffStringBuilder) return ((DiffStringBuilder)myText2).toDiffString(); |
| |
| throw new IllegalStateException("Bad DiffFragment: " + myText2.getClass()); |
| } |
| |
| /** |
| * Same as {@link #isModified()}, but doesn't require texts checked for null. |
| * @return true iff both texts are present and {@link #isModified()} |
| */ |
| public boolean isChange() { |
| return (myText1 != null) && (myText2 != null) && isModified(); |
| } |
| |
| /** |
| * @return true iff both texts are present and not {@link #isModified()} |
| */ |
| public boolean isEqual() { |
| return (myText1 != null) && (myText2 != null) && !isModified(); |
| } |
| |
| @TestOnly |
| public static DiffFragment unchanged(@Nullable String text1, @Nullable String text2) { |
| return unchanged(DiffString.createNullable(text1), DiffString.createNullable(text2)); |
| } |
| |
| public static DiffFragment unchanged(@Nullable DiffString text1, @Nullable DiffString text2) { |
| if (text1 == null) text1 = DiffString.EMPTY; |
| if (text2 == null) text2 = DiffString.EMPTY; |
| DiffFragment result = new DiffFragment(text1, text2); |
| result.setModified(false); |
| return result; |
| } |
| |
| public boolean isOneSide() { |
| return (myText1 == null) || (myText2 == null); |
| } |
| } |