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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.query;
import com.google.common.annotations.Beta;
import com.yahoo.protect.Validator;
import java.util.Iterator;
/**
* This represents a query where all terms are required to match in the same element id.
* The primary usecase is to allow efficient search in arrays and maps of struct.
* The common path is the field name containing the struct.
* @author baldersheim
*/
@Beta
public class SameElementItem extends CompositeIndexedItem {
public SameElementItem(String commonPath) {
setIndexName(commonPath);
}
@Override
public String getIndexedString() {
StringBuilder buf = new StringBuilder();
for (Iterator<Item> i = getItemIterator(); i.hasNext();) {
IndexedItem indexedItem = (IndexedItem) i.next();
buf.append(indexedItem.getIndexedString());
if (i.hasNext()) {
buf.append(' ');
}
}
return buf.toString();
}
protected void appendHeadingString(StringBuilder buffer) { }
protected void appendBodyString(StringBuilder buffer) {
appendIndexString(buffer);
buffer.append('{');
for (Iterator<Item> i = getItemIterator(); i.hasNext();) {
TermItem term = (TermItem) i.next();
buffer.append(term.getIndexName()).append(':').append(term.getIndexedString());
if (i.hasNext()) {
buffer.append(' ');
}
}
buffer.append('}');
}
@Override
public int getNumWords() {
return getItemCount();
}
@Override
protected void adding(Item item) {
Validator.ensureInstanceOf("Child item", item, TermItem.class);
TermItem asTerm = (TermItem) item;
Validator.ensureNonEmpty("Struct fieldname", asTerm.getIndexName());
Validator.ensureNonEmpty("Query term", asTerm.getIndexedString());
}
@Override
public ItemType getItemType() {
return ItemType.SAME_ELEMENT;
}
@Override
public String getName() {
return getItemType().toString();
}
}
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