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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.hitfield;
import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException;
/**
* A specialized list iterator to manipulate tokens in HitField objects.
*
* @author Steinar Knutsen
*/
public class TokenFieldIterator implements ListIterator<FieldPart> {
private int index = 0;
private int prevReturned = 0;
private final List<FieldPart> fieldList;
private final HitField hitField;
public TokenFieldIterator(List<FieldPart> fieldList, HitField hitField) {
this.fieldList = fieldList;
this.hitField = hitField;
}
@Override
public void add(FieldPart o) {
fieldList.add(index, o);
index++;
hitField.markDirty();
}
@Override
public boolean hasNext() {
int i = index;
while (i < fieldList.size()) {
if (fieldList.get(i).isToken())
return true;
i++;
}
return false;
}
@Override
public boolean hasPrevious() {
int i = index;
while (i > 0) {
i--;
if (fieldList.get(i).isToken())
return true;
}
return false;
}
@Override
public FieldPart next() {
int i = index;
while (i < fieldList.size()) {
if (fieldList.get(i).isToken()) {
index = i + 1;
prevReturned = i;
return fieldList.get(i);
}
i++;
}
throw new NoSuchElementException("No more tokens available.");
}
@Override
public int nextIndex() {
int i = index;
while (i < fieldList.size()) {
if (fieldList.get(i).isToken())
return i;
i++;
}
return fieldList.size();
}
@Override
public FieldPart previous() {
int i = index;
while (i > 0) {
i--;
if (fieldList.get(i).isToken()) {
index = i;
prevReturned = i;
return fieldList.get(i);
}
}
throw new NoSuchElementException("Trying to go before first token available.");
}
@Override
public int previousIndex() {
int i = index;
while (i > 0) {
i--;
if (fieldList.get(i).isToken())
return i;
}
return -1;
}
@Override
public void remove() {
fieldList.remove(prevReturned);
if (prevReturned < index)
index--;
hitField.markDirty();
}
@Override
public void set(FieldPart o) {
fieldList.set(prevReturned, o);
hitField.markDirty();
}
}
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