/*
* 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.metadata;
import com.facebook.presto.spi.function.OperatorType;
import com.facebook.presto.spi.type.TypeSignature;
import java.util.List;
import static com.facebook.presto.metadata.FunctionKind.SCALAR;
import static com.facebook.presto.metadata.FunctionRegistry.mangleOperatorName;
import static com.google.common.collect.ImmutableList.copyOf;
import static java.util.Arrays.asList;
import static java.util.Collections.emptyList;
import static java.util.Objects.requireNonNull;
public final class SignatureBuilder
{
private String name;
private FunctionKind kind;
private List<TypeVariableConstraint> typeVariableConstraints = emptyList();
private List<LongVariableConstraint> longVariableConstraints = emptyList();
private TypeSignature returnType;
private List<TypeSignature> argumentTypes = emptyList();
private boolean variableArity;
public SignatureBuilder() {}
public SignatureBuilder name(String name)
{
this.name = requireNonNull(name, "name is null");
return this;
}
public SignatureBuilder kind(FunctionKind kind)
{
this.kind = kind;
return this;
}
public SignatureBuilder operatorType(OperatorType operatorType)
{
this.name = mangleOperatorName(requireNonNull(operatorType, "operatorType is null"));
this.kind = SCALAR;
return this;
}
public SignatureBuilder typeVariableConstraints(TypeVariableConstraint... typeVariableConstraints)
{
return typeVariableConstraints(asList(requireNonNull(typeVariableConstraints, "typeVariableConstraints is null")));
}
public SignatureBuilder typeVariableConstraints(List<TypeVariableConstraint> typeVariableConstraints)
{
this.typeVariableConstraints = copyOf(requireNonNull(typeVariableConstraints, "typeVariableConstraints is null"));
return this;
}
public SignatureBuilder returnType(TypeSignature returnType)
{
this.returnType = requireNonNull(returnType, "returnType is null");
return this;
}
public SignatureBuilder longVariableConstraints(LongVariableConstraint... longVariableConstraints)
{
return longVariableConstraints(asList(requireNonNull(longVariableConstraints, "longVariableConstraints is null")));
}
public SignatureBuilder longVariableConstraints(List<LongVariableConstraint> longVariableConstraints)
{
this.longVariableConstraints = copyOf(requireNonNull(longVariableConstraints, "longVariableConstraints is null"));
return this;
}
public SignatureBuilder argumentTypes(TypeSignature... argumentTypes)
{
return argumentTypes(asList(requireNonNull(argumentTypes, "argumentTypes is Null")));
}
public SignatureBuilder argumentTypes(List<TypeSignature> argumentTypes)
{
this.argumentTypes = copyOf(requireNonNull(argumentTypes, "argumentTypes is null"));
return this;
}
public SignatureBuilder setVariableArity(boolean variableArity)
{
this.variableArity = variableArity;
return this;
}
public Signature build()
{
return new Signature(name, kind, typeVariableConstraints, longVariableConstraints, returnType, argumentTypes, variableArity);
}
}