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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.predicate.utils;
import com.yahoo.document.predicate.Predicate;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.function.Consumer;
/**
* Parses a feed file containing documents in XML format. Its implementation is based on the following assumptions:
* 1. Each document has single predicate field.
* 2. The predicate is stored in a field named "boolean".
*
* @author bjorncs
*/
public class VespaFeedParser {
public static int parseDocuments(String feedFile, int maxDocuments, Consumer<Predicate> consumer) throws IOException {
int documentCount = 0;
try (BufferedReader reader = new BufferedReader(new FileReader(feedFile), 8 * 1024)) {
reader.readLine();
reader.readLine(); // Skip to start of first document
String line = reader.readLine();
while (!line.startsWith("</vespafeed>") && documentCount < maxDocuments) {
while (!line.startsWith("<boolean>")) {
line = reader.readLine();
}
Predicate predicate = Predicate.fromString(extractBooleanExpression(line));
consumer.accept(predicate);
++documentCount;
while (!line.startsWith("<document") && !line.startsWith("</vespafeed>")) {
line = reader.readLine();
}
}
}
return documentCount;
}
private static String extractBooleanExpression(String line) {
return line.substring(9, line.length() - 10);
}
}
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