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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.search.query.profile.types;
import com.yahoo.search.query.profile.QueryProfile;
import com.yahoo.search.query.profile.QueryProfileRegistry;
import com.yahoo.search.yql.YqlQuery;
import com.yahoo.tensor.Tensor;
import com.yahoo.tensor.TensorType;
/**
* Superclass of query type field types.
* Field types are immutable.
*
* @author bratseth
*/
@SuppressWarnings("rawtypes")
public abstract class FieldType {
public static final PrimitiveFieldType stringType = new PrimitiveFieldType(String.class);
public static final PrimitiveFieldType integerType = new PrimitiveFieldType(Integer.class);
public static final PrimitiveFieldType longType = new PrimitiveFieldType(Long.class);
public static final PrimitiveFieldType floatType = new PrimitiveFieldType(Float.class);
public static final PrimitiveFieldType doubleType = new PrimitiveFieldType(Double.class);
public static final PrimitiveFieldType booleanType = new PrimitiveFieldType(Boolean.class);
public static final QueryFieldType queryType = new QueryFieldType();
public static final QueryProfileFieldType genericQueryProfileType = new QueryProfileFieldType();
/** Returns the class of instance values of this field type */
public abstract Class getValueClass();
/** Returns a string representation of this type which can be converted back to a type class by {@link #fromString} */
public abstract String stringValue();
public abstract String toString();
/** Returns a string describing possible instances of this type, suitable for user error messages */
public abstract String toInstanceDescription();
/** Converts the given type to an instance of this type, if possible. Returns null if not possible. */
public abstract Object convertFrom(Object o, QueryProfileRegistry registry);
/** Converts the given type to an instance of this type, if possible. Returns null if not possible. */
public abstract Object convertFrom(Object o, ConversionContext context);
/**
* Returns this type as a tensor type: The true tensor type is this is a tensor field an an empty type -
* interpreted as a double in numerical contexts - otherwise
*/
public TensorType asTensorType() { return TensorType.empty; }
/**
* Returns the field type for a given string name.
*
* @param typeString a type string - a primitive name, "query-profile" or "query-profile:profile-name"
* @param registry the registry in which query profile references are resolved when the last form above is used,
* or null in which case that form cannot be used
* @throws IllegalArgumentException if the string does not resolve to a type
*/
public static FieldType fromString(String typeString, QueryProfileTypeRegistry registry) {
if ("string".equals(typeString))
return stringType;
if ("integer".equals(typeString))
return integerType;
if ("long".equals(typeString))
return longType;
if ("float".equals(typeString))
return floatType;
if ("double".equals(typeString))
return doubleType;
if ("boolean".equals(typeString))
return booleanType;
if ("query".equals(typeString))
return queryType;
if (typeString.startsWith("tensor"))
return TensorFieldType.fromTypeString(typeString);
if ("query-profile".equals(typeString))
return genericQueryProfileType;
if (typeString.startsWith("query-profile:"))
return QueryProfileFieldType.fromString(typeString.substring("query-profile:".length()), registry);
throw new IllegalArgumentException("Unknown type '" + typeString + "'");
}
/** Returns true if the given object is a legal field value of some field value type */
public static boolean isLegalFieldValue(Object value) {
Class clazz = value.getClass();
if (clazz == String.class) return true;
if (clazz == Integer.class) return true;
if (clazz == Long.class) return true;
if (clazz == Float.class) return true;
if (clazz == Double.class) return true;
if (clazz == Boolean.class) return true;
if (clazz == YqlQuery.class) return true;
if (clazz == QueryProfile.class) return true;
if (clazz == Tensor.class) return true;
return false;
}
}
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