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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.schema;
import com.yahoo.api.annotations.Beta;
import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
/**
* A set of fields which can be queried as one.
*
* @author bratseth
*/
@Beta
public class FieldSet implements FieldInfo {
private final String name;
private final Set<String> fieldNames;
// Assigned when this is added to a schema
private Schema schema = null;
private FieldSet(Builder builder) {
this.name = builder.name;
this.fieldNames = Set.copyOf(builder.fieldNames);
}
@Override
public String name() { return name; }
@Override
public Field.Type type() {
if (schema == null || fieldNames.isEmpty()) return null;
return randomFieldInThis().type();
}
/** Returns whether this field or field set is attribute(s), i.e. does indexing: attribute. */
@Override
public boolean isAttribute() {
if (schema == null || fieldNames.isEmpty()) return false;
return randomFieldInThis().isAttribute();
}
/** Returns whether this field is index(es), i.e. does indexing: index. */
@Override
public boolean isIndex() {
if (schema == null || fieldNames.isEmpty()) return false;
return randomFieldInThis().isIndex();
}
void setSchema(Schema schema) {
if ( this.schema != null)
throw new IllegalStateException("Cannot add field set '" + name + "' to schema '" + schema.name() +
"' as it is already added to schema '" + this.schema.name() + "'");
this.schema = schema;
}
/** Use a random field in this to determine its properties. Any inconsistency will have been warned about on deploy. */
private Field randomFieldInThis() {
return schema.fields().get(fieldNames.iterator().next());
}
public Set<String> fieldNames() { return fieldNames; }
@Override
public boolean equals(Object o) {
if ( ! (o instanceof FieldSet other)) return false;
if ( ! this.name.equals(other.name)) return false;
if ( ! this.fieldNames.equals(other.fieldNames)) return false;
return true;
}
@Override
public int hashCode() {
return Objects.hash(name, fieldNames);
}
@Override
public String toString() { return "field set '" + name + "'"; }
public static class Builder {
private final String name;
private final Set<String> fieldNames = new HashSet<>();
public Builder(String name) {
this.name = name;
}
public Builder addField(String fieldName) {
fieldNames.add(fieldName);
return this;
}
public FieldSet build() {
return new FieldSet(this);
}
}
}
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