/*
* Copyright 2000-2015 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.diff.tools.util;
import com.intellij.openapi.editor.ex.EditorEx;
import org.jetbrains.annotations.NotNull;
import java.util.List;
public abstract class PrevNextDifferenceIterableBase<T> implements PrevNextDifferenceIterable {
@NotNull
protected abstract List<? extends T> getChanges();
@NotNull
protected abstract EditorEx getEditor();
protected abstract int getStartLine(@NotNull T change);
protected abstract int getEndLine(@NotNull T change);
protected abstract void scrollToChange(@NotNull T change);
@Override
public boolean canGoNext() {
List<? extends T> changes = getChanges();
if (changes.isEmpty()) return false;
EditorEx editor = getEditor();
int line = editor.getCaretModel().getLogicalPosition().line;
if (line == editor.getDocument().getLineCount() - 1) return false;
T lastChange = changes.get(changes.size() - 1);
if (getStartLine(lastChange) <= line) return false;
return true;
}
@Override
public void goNext() {
List<? extends T> changes = getChanges();
int line = getEditor().getCaretModel().getLogicalPosition().line;
T next = null;
for (int i = 0; i < changes.size(); i++) {
T change = changes.get(i);
if (getStartLine(change) <= line) continue;
next = change;
break;
}
assert next != null;
scrollToChange(next);
}
@Override
public boolean canGoPrev() {
List<? extends T> changes = getChanges();
if (changes.isEmpty()) return false;
int line = getEditor().getCaretModel().getLogicalPosition().line;
if (line == 0) return false;
T firstChange = changes.get(0);
if (getEndLine(firstChange) > line) return false;
if (getStartLine(firstChange) >= line) return false;
return true;
}
@Override
public void goPrev() {
List<? extends T> changes = getChanges();
int line = getEditor().getCaretModel().getLogicalPosition().line;
T prev = null;
for (int i = 0; i < changes.size(); i++) {
T change = changes.get(i);
T next = i < changes.size() - 1 ? changes.get(i + 1) : null;
if (next == null || getEndLine(next) > line || getStartLine(next) >= line) {
prev = change;
break;
}
}
assert prev != null;
scrollToChange(prev);
}
}