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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.prelude.fastsearch;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.yahoo.data.access.Inspector;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* A docsum definition which knows how to decode a certain class of document
* summaries. The docsum definition has a name and a list of field definitions
*
* @author bratseth
* @author Bjørn Borud
*/
public class DocsumDefinition {
private final String name;
private final ImmutableList<DocsumField> fields;
/** True if this contains dynamic fields */
private final boolean dynamic;
// Mapping between field names and their index in this.fields
private final ImmutableMap<String, Integer> fieldNameToIndex;
public DocsumDefinition(String name, List<DocsumField> fields) {
this.name = name;
this.dynamic = false;
this.fields = ImmutableList.copyOf(fields);
ImmutableMap.Builder<String, Integer> fieldNameToIndexBuilder = new ImmutableMap.Builder<>();
int i = 0;
for (DocsumField field : fields)
fieldNameToIndexBuilder.put(field.name, i++);
this.fieldNameToIndex = fieldNameToIndexBuilder.build();
}
DocsumDefinition(DocumentdbInfoConfig.Documentdb.Summaryclass config) {
this.name = config.name();
List<DocsumField> fieldsBuilder = new ArrayList<>();
Map<String, Integer> fieldNameToIndexBuilder = new HashMap<>();
boolean dynamic = false;
for (DocumentdbInfoConfig.Documentdb.Summaryclass.Fields field : config.fields()) {
// no, don't switch the order of the two next lines :)
fieldNameToIndexBuilder.put(field.name(), fieldsBuilder.size());
fieldsBuilder.add(DocsumField.create(field.name(), field.type()));
if (field.dynamic())
dynamic = true;
}
this.dynamic = dynamic;
fields = ImmutableList.copyOf(fieldsBuilder);
fieldNameToIndex = ImmutableMap.copyOf(fieldNameToIndexBuilder);
}
/** Returns the field at this index, or null if none */
public DocsumField getField(int fieldIndex) {
if (fieldIndex >= fields.size()) return null;
return fields.get(fieldIndex);
}
/** Returns the field with this name, or null if none */
public DocsumField getField(String fieldName) {
Integer index = fieldNameToIndex.get(fieldName);
if (index == null) return null;
return getField(index);
}
/**
* Returns the given slime value as the type specified in this, or null if the type is not known.
* Even in a correctly configured system we may encounter field names for which we do not know the type,
* in the time period when a configuration is changing and one node has received the new configuration and
* another has not.
*/
public Object convert(String fieldName, Inspector value) {
DocsumField fieldType = getField(fieldName);
if (fieldType == null) return null;
return fieldType.convert(value);
}
public Set<String> fieldNames() {
return fieldNameToIndex.keySet();
}
@Override
public String toString() {
return "docsum definition '" + getName() + "'";
}
public String getName() {
return name;
}
public int getFieldCount() {
return fields.size();
}
public List<DocsumField> getFields() {
return fields;
}
/** Returns whether this summary contains one or more dynamic fields */
public boolean isDynamic() {
return dynamic;
}
}
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