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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.query.textserialize.item;
import com.yahoo.prelude.query.CompositeItem;
import com.yahoo.prelude.query.Item;
import com.yahoo.search.query.textserialize.serializer.DispatchForm;
import com.yahoo.search.query.textserialize.serializer.ItemIdMapper;
import java.util.ListIterator;
/**
* @author tonytv
*/
public class CompositeConverter<T extends CompositeItem> implements ItemFormConverter {
private final Class<T> itemClass;
public CompositeConverter(Class<T> itemClass) {
this.itemClass = itemClass;
}
@Override
public Object formToItem(String name, ItemArguments arguments, ItemContext itemContext) {
T item = newInstance();
addChildren(item, arguments, itemContext);
return item;
}
protected void addChildren(T item, ItemArguments arguments, ItemContext itemContext) {
for (Object child : arguments.children) {
item.addItem(asItem(child));
}
ItemInitializer.initialize(item, arguments, itemContext);
}
private static Item asItem(Object child) {
if (!(child instanceof Item) && child != null) {
throw new RuntimeException("Expected query item, but got '" + child.toString() +
"' [" + child.getClass().getName() + "]");
}
return (Item) child;
}
private T newInstance() {
try {
return itemClass.newInstance();
} catch (InstantiationException | IllegalAccessException e) {
throw new RuntimeException(e);
}
}
@Override
public DispatchForm itemToForm(Item item, ItemIdMapper itemIdMapper) {
CompositeItem compositeItem = (CompositeItem) item;
DispatchForm form = new DispatchForm(getFormName(item));
for (ListIterator<Item> i = compositeItem.getItemIterator(); i.hasNext() ;) {
form.addChild(i.next());
}
ItemInitializer.initializeForm(form, item, itemIdMapper);
return form;
}
protected String getFormName(Item item) {
return item.getItemType().name();
}
}
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