/*
* 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.sql.relational;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.type.FunctionType;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import java.util.List;
import java.util.Objects;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;
public final class LambdaDefinitionExpression
extends RowExpression
{
private final List<Type> argumentTypes;
private final List<String> arguments;
private final RowExpression body;
public LambdaDefinitionExpression(List<Type> argumentTypes, List<String> arguments, RowExpression body)
{
this.argumentTypes = ImmutableList.copyOf(requireNonNull(argumentTypes, "argumentTypes is null"));
this.arguments = ImmutableList.copyOf(requireNonNull(arguments, "arguments is null"));
checkArgument(argumentTypes.size() == arguments.size(), "Number of argument types does not match number of arguments");
this.body = requireNonNull(body, "body is null");
}
public List<Type> getArgumentTypes()
{
return argumentTypes;
}
public List<String> getArguments()
{
return arguments;
}
public RowExpression getBody()
{
return body;
}
@Override
public Type getType()
{
return new FunctionType(argumentTypes, body.getType());
}
@Override
public String toString()
{
return "(" + Joiner.on(",").join(arguments) + ") -> " + body;
}
@Override
public boolean equals(Object o)
{
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
LambdaDefinitionExpression that = (LambdaDefinitionExpression) o;
return Objects.equals(argumentTypes, that.argumentTypes) &&
Objects.equals(arguments, that.arguments) &&
Objects.equals(body, that.body);
}
@Override
public int hashCode()
{
return Objects.hash(argumentTypes, arguments, body);
}
@Override
public <C, R> R accept(RowExpressionVisitor<C, R> visitor, C context)
{
return visitor.visitLambda(this, context);
}
}