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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.prelude.fastsearch;
import com.yahoo.search.schema.DocumentSummary;
import com.yahoo.search.schema.Schema;
import com.yahoo.slime.BinaryFormat;
import com.yahoo.data.access.Inspector;
import com.yahoo.slime.Slime;
import com.yahoo.data.access.slime.SlimeAdapter;
import com.yahoo.prelude.ConfigurationException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Collection;
import java.util.Map;
import java.util.stream.Collectors;
import static com.yahoo.data.access.Type.OBJECT;
/**
* A set of docsum definitions
*
* @author bratseth
* @author Bjørn Borud
*/
public final class DocsumDefinitionSet {
public static final int SLIME_MAGIC_ID = 0x55555555;
private final Map<String, DocsumDefinition> definitionsByName;
public DocsumDefinitionSet(Schema schema) {
this(schema.documentSummaries().values());
}
public DocsumDefinitionSet(Collection<DocumentSummary> docsumDefinitions) {
this.definitionsByName = docsumDefinitions.stream()
.map(summary -> new DocsumDefinition(summary))
.collect(Collectors.toUnmodifiableMap(summary -> summary.name(),
summary -> summary));
}
/**
* Returns the summary definition of the given name, or the default if not found.
*
* @throws ConfigurationException if the requested summary class is not found and there is none called "default"
*/
public DocsumDefinition getDocsum(String summaryClass) {
if (summaryClass == null)
summaryClass = "default";
DocsumDefinition ds = definitionsByName.get(summaryClass);
if (ds == null)
ds = definitionsByName.get("default");
if (ds == null)
throw new ConfigurationException("Fetched hit with summary class " + summaryClass +
", but this summary class is not in current summary config (" + this + ")" +
" (that is, you asked for something unknown, and no default was found)");
return ds;
}
/** Do we have a summary definition with the given name */
public boolean hasDocsum(String summaryClass) {
if (summaryClass == null)
summaryClass = "default";
return definitionsByName.containsKey(summaryClass);
}
/**
* Makes data available for decoding for the given hit.
*
* @param summaryClass the requested summary class
* @param data docsum data from backend
* @param hit the Hit corresponding to this document summary
* @return Error message or null on success.
* @throws ConfigurationException if the summary class of this hit is missing
*/
public String lazyDecode(String summaryClass, byte[] data, FastHit hit) {
ByteBuffer buffer = ByteBuffer.wrap(data);
buffer.order(ByteOrder.LITTLE_ENDIAN);
long docsumClassId = buffer.getInt();
if (docsumClassId != SLIME_MAGIC_ID) {
throw new IllegalArgumentException("Only expecting SchemaLess docsums - summary class:" + summaryClass + " hit:" + hit);
}
DocsumDefinition docsumDefinition = getDocsum(summaryClass);
Slime value = BinaryFormat.decode(buffer.array(), buffer.arrayOffset()+buffer.position(), buffer.remaining());
Inspector docsum = new SlimeAdapter(value.get());
if (docsum.type() != OBJECT) {
return "Hit " + hit + " failed: " + docsum.asString();
}
hit.addSummary(docsumDefinition, docsum);
return null;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
for (Map.Entry<String, DocsumDefinition> e : definitionsByName.entrySet() ) {
if (sb.length() != 0) {
sb.append(",");
}
sb.append("[").append(e.getKey()).append(",").append(e.getValue().name()).append("]");
}
return sb.toString();
}
public int size() {
return definitionsByName.size();
}
}
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