com.facebook.presto.jdbc.internal.spi.relation.CallExpression Maven / Gradle / Ivy

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/*
 * 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.relation;

import com.facebook.presto.jdbc.internal.common.type.Type;
import com.facebook.presto.jdbc.internal.spi.SourceLocation;
import com.facebook.presto.jdbc.internal.spi.function.FunctionHandle;
import com.facebook.presto.jdbc.internal.jackson.annotation.JsonCreator;
import com.facebook.presto.jdbc.internal.jackson.annotation.JsonProperty;

import com.facebook.presto.jdbc.internal.javax.annotation.concurrent.Immutable;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Collectors;

import static java.util.Collections.unmodifiableList;
import static java.util.Objects.requireNonNull;

@Immutable
public final class CallExpression
        extends RowExpression
{
    private final String displayName;
    private final FunctionHandle functionHandle;
    private final Type returnType;
    private final List arguments;

    public CallExpression(
            // The name here should only be used for display (toString)
            String displayName,
            FunctionHandle functionHandle,
            Type returnType,
            List arguments)
    {
        this(arguments.stream()
                .filter(x -> x.getSourceLocation().isPresent())
                .map(x -> x.getSourceLocation())
                .findFirst().orElse(Optional.empty()),
                displayName, functionHandle, returnType, arguments);
    }

    @JsonCreator
    public CallExpression(
            @JsonProperty("sourceLocation") Optional sourceLocation,
            // The name here should only be used for display (toString)
            @JsonProperty("displayName") String displayName,
            @JsonProperty("functionHandle") FunctionHandle functionHandle,
            @JsonProperty("returnType") Type returnType,
            @JsonProperty("arguments") List arguments)
    {
        super(sourceLocation);
        this.displayName = requireNonNull(displayName, "displayName is null");
        this.functionHandle = requireNonNull(functionHandle, "functionHandle is null");
        this.returnType = requireNonNull(returnType, "returnType is null");
        this.arguments = unmodifiableList(new ArrayList<>(requireNonNull(arguments, "arguments is null")));
    }

    @JsonProperty
    public String getDisplayName()
    {
        return displayName;
    }

    @JsonProperty
    public FunctionHandle getFunctionHandle()
    {
        return functionHandle;
    }

    @Override
    @JsonProperty("returnType")
    public Type getType()
    {
        return returnType;
    }

    @JsonProperty
    public List getArguments()
    {
        return arguments;
    }

    @Override
    public String toString()
    {
        return displayName + "(" + String.join(", ", arguments.stream().map(RowExpression::toString).collect(Collectors.toList())) + ")";
    }

    @Override
    public int hashCode()
    {
        return Objects.hash(functionHandle, arguments);
    }

    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        CallExpression other = (CallExpression) obj;
        return Objects.equals(this.functionHandle, other.functionHandle) && Objects.equals(this.arguments, other.arguments);
    }

    @Override
    public  R accept(RowExpressionVisitor visitor, C context)
    {
        return visitor.visitCall(this, context);
    }

    @Override
    public RowExpression canonicalize()
    {
        return getSourceLocation().isPresent() ? new CallExpression(Optional.empty(), displayName, functionHandle, returnType, arguments) : this;
    }
}