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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.node.admin.maintenance.acl;
import com.yahoo.vespa.hosted.node.admin.configserver.noderepository.Acl;
import com.yahoo.vespa.hosted.node.admin.task.util.file.LineEdit;
import com.yahoo.vespa.hosted.node.admin.task.util.file.LineEditor;
import com.yahoo.vespa.hosted.node.admin.task.util.network.IPVersion;
import java.util.List;
/**
* An editor that assumes all rules in the filter table are exactly as the the wanted rules
*
* @author smorgrav
*/
class FilterTableLineEditor implements LineEditor {
private final List<String> wantedRules;
private int position = 0;
private FilterTableLineEditor(List<String> wantedRules) {
this.wantedRules = List.copyOf(wantedRules);
}
static FilterTableLineEditor from(Acl acl, IPVersion ipVersion) {
List<String> rules = acl.toRules(ipVersion);
return new FilterTableLineEditor(rules);
}
@Override
public LineEdit edit(String line) {
int index = indexOf(wantedRules, line, position);
// Unwanted rule, remove
if (index < 0) return LineEdit.remove();
// Wanted rule at the expected position, no diff
if (index == position) {
position++;
return LineEdit.none();
}
// Insert the rules between position and index before index
List<String> toInsert = wantedRules.subList(position, index);
position = ++index;
return LineEdit.insertBefore(toInsert);
}
@Override
public List<String> onComplete() {
return wantedRules.subList(position, wantedRules.size());
}
private static <T> int indexOf(List<T> list, T value, int startPos) {
for (int i = startPos; i < list.size(); i++) {
if (value.equals(list.get(i)))
return i;
}
return -1;
}
}
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