com.facebook.presto.jdbc.internal.spi.type.TypeParameter Maven / Gradle / Ivy
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.presto.jdbc.internal.spi.type;
import java.util.Objects;
import static java.lang.String.format;
public class TypeParameter
{
private final ParameterKind kind;
private final Object value;
private TypeParameter(ParameterKind kind, Object value)
{
this.kind = kind;
this.value = value;
}
public static TypeParameter of(Type type)
{
return new TypeParameter(ParameterKind.TYPE, type);
}
public static TypeParameter of(long longLiteral)
{
return new TypeParameter(ParameterKind.LONG, longLiteral);
}
public static TypeParameter of(NamedType namedType)
{
return new TypeParameter(ParameterKind.NAMED_TYPE, namedType);
}
public static TypeParameter of(String variable)
{
return new TypeParameter(ParameterKind.VARIABLE, variable);
}
public static TypeParameter of(TypeSignatureParameter parameter, TypeManager typeManager)
{
switch (parameter.getKind()) {
case TYPE: {
Type type = typeManager.getType(parameter.getTypeSignature());
return of(type);
}
case LONG:
return of(parameter.getLongLiteral());
case NAMED_TYPE: {
Type type = typeManager.getType(parameter.getNamedTypeSignature().getTypeSignature());
return of(new NamedType(
parameter.getNamedTypeSignature().getFieldName(),
type));
}
case VARIABLE:
return of(parameter.getVariable());
default:
throw new UnsupportedOperationException(format("Unsupported parameter [%s]", parameter));
}
}
public ParameterKind getKind()
{
return kind;
}
public A getValue(ParameterKind expectedParameterKind, Class target)
{
if (kind != expectedParameterKind) {
throw new AssertionError(format("ParameterKind is [%s] but expected [%s]", kind, expectedParameterKind));
}
return target.cast(value);
}
public boolean isLongLiteral()
{
return kind == ParameterKind.LONG;
}
public Type getType()
{
return getValue(ParameterKind.TYPE, Type.class);
}
public Long getLongLiteral()
{
return getValue(ParameterKind.LONG, Long.class);
}
public NamedType getNamedType()
{
return getValue(ParameterKind.NAMED_TYPE, NamedType.class);
}
public String getVariable()
{
return getValue(ParameterKind.VARIABLE, String.class);
}
@Override
public String toString()
{
return value.toString();
}
@Override
public boolean equals(Object o)
{
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
TypeParameter other = (TypeParameter) o;
return Objects.equals(this.kind, other.kind) &&
Objects.equals(this.value, other.value);
}
@Override
public int hashCode()
{
return Objects.hash(kind, value);
}
}