/*
* 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.comparison.iterables;
import com.intellij.diff.util.Range;
import org.jetbrains.annotations.NotNull;
import java.util.Iterator;
class SubiterableDiffIterable extends ChangeDiffIterableBase {
@NotNull private final DiffIterable myIterable;
private final int myStart1;
private final int myStart2;
private final int myEnd1;
private final int myEnd2;
public SubiterableDiffIterable(@NotNull DiffIterable iterable, int start1, int end1, int start2, int end2) {
super(end1 - start1, end2 - start2);
myIterable = iterable;
myStart1 = start1;
myStart2 = start2;
myEnd1 = end1;
myEnd2 = end2;
}
@NotNull
@Override
protected ChangeIterable createChangeIterable() {
return new SubiterableChangeIterable();
}
private class SubiterableChangeIterable implements ChangeIterable {
private final Iterator<Range> myIterator;
private Range myLast;
public SubiterableChangeIterable() {
myIterator = myIterable.changes();
next();
}
@Override
public boolean valid() {
return myLast != null;
}
@Override
public void next() {
myLast = null;
while (myIterator.hasNext()) {
Range range = myIterator.next();
if (range.end1 < myStart1 || range.end2 < myStart2) continue;
if (range.start1 > myEnd1 || range.start2 > myEnd2) break;
myLast = new Range(Math.max(myStart1, range.start1) - myStart1, Math.min(myEnd1, range.end1) - myStart1,
Math.max(myStart2, range.start2) - myStart2, Math.min(myEnd2, range.end2) - myStart2);
if (!myLast.isEmpty()) break;
myLast = null;
}
}
@Override
public int getStart1() {
return myLast.start1;
}
@Override
public int getStart2() {
return myLast.start2;
}
@Override
public int getEnd1() {
return myLast.end1;
}
@Override
public int getEnd2() {
return myLast.end2;
}
}
}