/*
* 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.actions;
import com.intellij.openapi.util.Pair;
import org.jetbrains.annotations.NotNull;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
public abstract class BufferedLineIterator implements Iterator<Pair<Integer, CharSequence>> {
@NotNull private final List<Pair<Integer, CharSequence>> myBuffer;
public BufferedLineIterator() {
myBuffer = new LinkedList<Pair<Integer, CharSequence>>();
}
public abstract boolean hasNextBlock();
public abstract void loadNextBlock();
protected void init() {
while (myBuffer.isEmpty() && hasNextBlock()) {
loadNextBlock();
}
}
protected void addLine(int line, @NotNull CharSequence text) {
myBuffer.add(Pair.create(line, text));
}
@Override
public boolean hasNext() {
return !myBuffer.isEmpty();
}
@Override
public Pair<Integer, CharSequence> next() {
Pair<Integer, CharSequence> result = myBuffer.remove(0);
while (myBuffer.isEmpty() && hasNextBlock()) {
loadNextBlock();
}
return result;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}