org.apache.poi.xdgf.usermodel.section.CombinedIterable Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of poi-ooxml Show documentation
Show all versions of poi-ooxml Show documentation
Apache POI - Java API To Access Microsoft Format Files
/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You 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 org.apache.poi.xdgf.usermodel.section;
import java.util.Collections;
import java.util.Iterator;
import java.util.Map.Entry;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.SortedMap;
/**
* An iterator used to iterate over the base and master items
*
* @param
*/
public class CombinedIterable implements Iterable {
final SortedMap _baseItems;
final SortedMap _masterItems;
public CombinedIterable(SortedMap baseItems,
SortedMap masterItems) {
_baseItems = baseItems;
_masterItems = masterItems;
}
@Override
public Iterator iterator() {
final Iterator> vmasterI;
if (_masterItems != null) {
vmasterI = _masterItems.entrySet().iterator();
} else {
final Set> empty = Collections.emptySet();
vmasterI = empty.iterator();
}
return new Iterator() {
Long lastI = Long.MIN_VALUE;
Entry currentBase = null;
Entry currentMaster = null;
// grab the iterator for both
Iterator> baseI = _baseItems.entrySet().iterator();
Iterator> masterI = vmasterI;
@Override
public boolean hasNext() {
return currentBase != null || currentMaster != null
|| baseI.hasNext() || masterI.hasNext();
}
@Override
public T next() {
// TODO: This seems far more complex than it needs to be
long baseIdx = Long.MAX_VALUE;
long masterIdx = Long.MAX_VALUE;
if (currentBase == null) {
while (baseI.hasNext()) {
currentBase = baseI.next();
if (currentBase.getKey() > lastI) {
baseIdx = currentBase.getKey();
break;
}
}
} else {
baseIdx = currentBase.getKey();
}
if (currentMaster == null) {
while (masterI.hasNext()) {
currentMaster = masterI.next();
if (currentMaster.getKey() > lastI) {
masterIdx = currentMaster.getKey();
break;
}
}
} else {
masterIdx = currentMaster.getKey();
}
T val;
if (currentBase != null) {
if (baseIdx <= masterIdx) {
lastI = baseIdx;
val = currentBase.getValue();
// discard master if same as base
if (masterIdx == baseIdx) {
currentMaster = null;
}
currentBase = null;
} else {
lastI = masterIdx;
val = currentMaster.getValue();
currentMaster = null;
}
} else if (currentMaster != null) {
lastI = currentMaster.getKey();
val = currentMaster.getValue();
currentMaster = null;
} else {
throw new NoSuchElementException();
}
return val;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
}
}