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sparksoniq.jsoniq.runtime.iterator.functions.object.ObjectAccumulateFunctionIterator Maven / Gradle / Ivy
/*
* 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.
*
* Authors: Stefan Irimescu, Can Berker Cikis
*
*/
package sparksoniq.jsoniq.runtime.iterator.functions.object;
import sparksoniq.exceptions.IteratorFlowException;
import sparksoniq.jsoniq.item.ItemFactory;
import sparksoniq.jsoniq.runtime.iterator.RuntimeIterator;
import sparksoniq.jsoniq.runtime.iterator.functions.base.LocalFunctionCallIterator;
import sparksoniq.jsoniq.runtime.metadata.IteratorMetadata;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import org.rumbledb.api.Item;
public class ObjectAccumulateFunctionIterator extends LocalFunctionCallIterator {
/**
*
*/
private static final long serialVersionUID = 1L;
public ObjectAccumulateFunctionIterator(List arguments, IteratorMetadata iteratorMetadata) {
super(arguments, iteratorMetadata);
}
@Override
public Item next() {
if (this._hasNext) {
RuntimeIterator sequenceIterator = this._children.get(0);
List- items = getItemsFromIteratorWithCurrentContext(sequenceIterator);
LinkedHashMap
> keyValuePairs = new LinkedHashMap<>();
for (Item item : items) {
// ignore non-object items
if (item.isObject()) {
for (String key : item.getKeys()) {
Item value = item.getItemByKey(key);
if (!keyValuePairs.containsKey(key)) {
List- valueList = new ArrayList<>();
valueList.add(value);
keyValuePairs.put(key, valueList);
}
// store values for key collisions in a list
else {
keyValuePairs.get(key).add(value);
}
}
}
}
Item result = ItemFactory.getInstance().createObjectItem(keyValuePairs);
this._hasNext = false;
return result;
}
throw new IteratorFlowException(RuntimeIterator.FLOW_EXCEPTION_MESSAGE + " ACCUMULATE function",
getMetadata());
}
}
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