com.facebook.presto.jdbc.internal.spi.function.Signature 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.function;
import com.facebook.presto.jdbc.internal.common.QualifiedObjectName;
import com.facebook.presto.jdbc.internal.common.type.TypeSignature;
import com.facebook.presto.jdbc.internal.jackson.annotation.JsonCreator;
import com.facebook.presto.jdbc.internal.jackson.annotation.JsonProperty;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import static java.util.Collections.emptyList;
import static java.util.Collections.unmodifiableList;
import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.toList;
import static java.util.stream.Stream.concat;
public final class Signature
{
private final QualifiedObjectName name;
private final FunctionKind kind;
private final List typeVariableConstraints;
private final List longVariableConstraints;
private final TypeSignature returnType;
private final List argumentTypes;
private final boolean variableArity;
@JsonCreator
public Signature(
@JsonProperty("name") QualifiedObjectName name,
@JsonProperty("kind") FunctionKind kind,
@JsonProperty("typeVariableConstraints") List typeVariableConstraints,
@JsonProperty("longVariableConstraints") List longVariableConstraints,
@JsonProperty("returnType") TypeSignature returnType,
@JsonProperty("argumentTypes") List argumentTypes,
@JsonProperty("variableArity") boolean variableArity)
{
requireNonNull(name, "name is null");
requireNonNull(typeVariableConstraints, "typeVariableConstraints is null");
requireNonNull(longVariableConstraints, "longVariableConstraints is null");
this.name = name;
this.kind = requireNonNull(kind, "type is null");
this.typeVariableConstraints = unmodifiableList(new ArrayList<>(typeVariableConstraints));
this.longVariableConstraints = unmodifiableList(new ArrayList<>(longVariableConstraints));
this.returnType = requireNonNull(returnType, "returnType is null");
this.argumentTypes = unmodifiableList(new ArrayList<>(requireNonNull(argumentTypes, "argumentTypes is null")));
this.variableArity = variableArity;
}
public Signature(QualifiedObjectName name, FunctionKind kind, TypeSignature returnType, TypeSignature... argumentTypes)
{
this(name, kind, returnType, unmodifiableList(Arrays.asList(argumentTypes)));
}
public Signature(QualifiedObjectName name, FunctionKind kind, TypeSignature returnType, List argumentTypes)
{
this(name, kind, emptyList(), emptyList(), returnType, argumentTypes, false);
}
@JsonProperty
public QualifiedObjectName getName()
{
return name;
}
public String getNameSuffix()
{
return name.getObjectName();
}
@JsonProperty
public FunctionKind getKind()
{
return kind;
}
@JsonProperty
public TypeSignature getReturnType()
{
return returnType;
}
@JsonProperty
public List getArgumentTypes()
{
return argumentTypes;
}
@JsonProperty
public boolean isVariableArity()
{
return variableArity;
}
@JsonProperty
public List getTypeVariableConstraints()
{
return typeVariableConstraints;
}
@JsonProperty
public List getLongVariableConstraints()
{
return longVariableConstraints;
}
@Override
public int hashCode()
{
return Objects.hash(name, kind, typeVariableConstraints, longVariableConstraints, returnType, argumentTypes, variableArity);
}
@Override
public boolean equals(Object obj)
{
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
Signature other = (Signature) obj;
return Objects.equals(this.name, other.name) &&
Objects.equals(this.kind, other.kind) &&
Objects.equals(this.typeVariableConstraints, other.typeVariableConstraints) &&
Objects.equals(this.longVariableConstraints, other.longVariableConstraints) &&
Objects.equals(this.returnType, other.returnType) &&
Objects.equals(this.argumentTypes, other.argumentTypes) &&
Objects.equals(this.variableArity, other.variableArity);
}
@Override
public String toString()
{
List allConstraints = concat(
typeVariableConstraints.stream().map(TypeVariableConstraint::toString),
longVariableConstraints.stream().map(LongVariableConstraint::toString))
.collect(toList());
return name + (allConstraints.isEmpty() ? "" : "<" + String.join(",", allConstraints) + ">") +
"(" + String.join(",", argumentTypes.stream().map(TypeSignature::toString).collect(toList())) + "):" + returnType;
}
/*
* similar to T extends MyClass...>, if Java supported varargs wildcards
*/
public static TypeVariableConstraint withVariadicBound(String name, String variadicBound)
{
return new TypeVariableConstraint(name, false, false, variadicBound, false);
}
public static TypeVariableConstraint comparableWithVariadicBound(String name, String variadicBound)
{
return new TypeVariableConstraint(name, true, false, variadicBound, false);
}
public static TypeVariableConstraint typeVariable(String name)
{
return new TypeVariableConstraint(name, false, false, null, false);
}
public static TypeVariableConstraint comparableTypeParameter(String name)
{
return new TypeVariableConstraint(name, true, false, null, false);
}
public static TypeVariableConstraint orderableWithVariadicBound(String name, String variadicBound)
{
return new TypeVariableConstraint(name, false, true, variadicBound, false);
}
public static TypeVariableConstraint orderableTypeParameter(String name)
{
return new TypeVariableConstraint(name, false, true, null, false);
}
public static TypeVariableConstraint nonDecimalNumericTypeParameter(String name)
{
return new TypeVariableConstraint(name, false, false, null, true);
}
public static LongVariableConstraint longVariableExpression(String variable, String expression)
{
return new LongVariableConstraint(variable, expression);
}
}
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