/*
* 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.planner;
import com.facebook.presto.metadata.FunctionInfo;
import com.facebook.presto.metadata.FunctionRegistry;
import com.facebook.presto.metadata.Metadata;
import com.facebook.presto.metadata.Signature;
import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.sql.analyzer.SemanticException;
import com.facebook.presto.sql.tree.AstVisitor;
import com.facebook.presto.sql.tree.BooleanLiteral;
import com.facebook.presto.sql.tree.Cast;
import com.facebook.presto.sql.tree.DoubleLiteral;
import com.facebook.presto.sql.tree.Expression;
import com.facebook.presto.sql.tree.FunctionCall;
import com.facebook.presto.sql.tree.GenericLiteral;
import com.facebook.presto.sql.tree.IntervalLiteral;
import com.facebook.presto.sql.tree.Literal;
import com.facebook.presto.sql.tree.LongLiteral;
import com.facebook.presto.sql.tree.NegativeExpression;
import com.facebook.presto.sql.tree.NullLiteral;
import com.facebook.presto.sql.tree.QualifiedName;
import com.facebook.presto.sql.tree.StringLiteral;
import com.facebook.presto.sql.tree.TimeLiteral;
import com.facebook.presto.sql.tree.TimestampLiteral;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
import io.airlift.slice.Slice;
import java.util.List;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
import static com.facebook.presto.spi.type.BooleanType.BOOLEAN;
import static com.facebook.presto.spi.type.DoubleType.DOUBLE;
import static com.facebook.presto.spi.type.VarcharType.VARCHAR;
import static com.facebook.presto.sql.analyzer.SemanticErrorCode.TYPE_MISMATCH;
import static com.facebook.presto.util.DateTimeUtils.parseDayTimeInterval;
import static com.facebook.presto.util.DateTimeUtils.parseTime;
import static com.facebook.presto.util.DateTimeUtils.parseTimestamp;
import static com.facebook.presto.util.DateTimeUtils.parseYearMonthInterval;
import static com.google.common.base.Charsets.UTF_8;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static io.airlift.slice.Slices.utf8Slice;
public final class LiteralInterpreter
{
private LiteralInterpreter() {}
public static Object evaluate(Metadata metadata, ConnectorSession session, Expression node)
{
if (!(node instanceof Literal)) {
throw new IllegalArgumentException("node must be a Literal");
}
return new LiteralVisitor(metadata).process(node, session);
}
public static List<Expression> toExpressions(List<?> objects, List<? extends Type> types)
{
checkNotNull(objects, "objects is null");
checkNotNull(types, "types is null");
checkArgument(objects.size() == types.size(), "objects and types do not have the same size");
ImmutableList.Builder<Expression> expressions = ImmutableList.builder();
for (int i = 0; i < objects.size(); i++) {
Object object = objects.get(i);
Type type = types.get(i);
expressions.add(toExpression(object, type));
}
return expressions.build();
}
public static Expression toExpression(Object object, Type type)
{
if (object instanceof Expression) {
return (Expression) object;
}
if (object == null) {
return new Cast(new NullLiteral(), type.getName());
}
if (type.equals(BIGINT)) {
return new LongLiteral(object.toString());
}
if (type.equals(DOUBLE)) {
Double value = (Double) object;
if (value.isNaN()) {
return new FunctionCall(new QualifiedName("nan"), ImmutableList.<Expression>of());
}
else if (value == Double.NEGATIVE_INFINITY) {
return new NegativeExpression(new FunctionCall(new QualifiedName("infinity"), ImmutableList.<Expression>of()));
}
else if (value == Double.POSITIVE_INFINITY) {
return new FunctionCall(new QualifiedName("infinity"), ImmutableList.<Expression>of());
}
else {
return new DoubleLiteral(object.toString());
}
}
if (type.equals(VARCHAR)) {
if (object instanceof Slice) {
return new StringLiteral(((Slice) object).toString(UTF_8));
}
if (object instanceof String) {
return new StringLiteral((String) object);
}
}
if (type.equals(BOOLEAN)) {
return new BooleanLiteral(object.toString());
}
Signature signature = FunctionRegistry.getMagicLiteralFunctionSignature(type);
Expression rawLiteral = toExpression(object, FunctionRegistry.type(type.getJavaType()));
return new FunctionCall(new QualifiedName(signature.getName()), ImmutableList.of(rawLiteral));
}
private static class LiteralVisitor
extends AstVisitor<Object, ConnectorSession>
{
private final Metadata metadata;
private LiteralVisitor(Metadata metadata)
{
this.metadata = metadata;
}
@Override
protected Object visitLiteral(Literal node, ConnectorSession session)
{
throw new UnsupportedOperationException("Unhandled literal type: " + node);
}
@Override
protected Object visitBooleanLiteral(BooleanLiteral node, ConnectorSession session)
{
return node.getValue();
}
@Override
protected Long visitLongLiteral(LongLiteral node, ConnectorSession session)
{
return node.getValue();
}
@Override
protected Double visitDoubleLiteral(DoubleLiteral node, ConnectorSession session)
{
return node.getValue();
}
@Override
protected Slice visitStringLiteral(StringLiteral node, ConnectorSession session)
{
return node.getSlice();
}
@Override
protected Object visitGenericLiteral(GenericLiteral node, ConnectorSession session)
{
Type type = metadata.getType(node.getType());
if (type == null) {
throw new SemanticException(TYPE_MISMATCH, node, "Unknown type: " + node.getType());
}
FunctionInfo operator;
try {
operator = metadata.getFunctionRegistry().getCoercion(VARCHAR, type);
}
catch (IllegalArgumentException e) {
throw new SemanticException(TYPE_MISMATCH, node, "No literal form for type %s", type);
}
try {
return ExpressionInterpreter.invoke(session, operator.getMethodHandle(), ImmutableList.<Object>of(utf8Slice(node.getValue())));
}
catch (Throwable throwable) {
throw Throwables.propagate(throwable);
}
}
@Override
protected Long visitTimeLiteral(TimeLiteral node, ConnectorSession session)
{
return parseTime(session.getTimeZoneKey(), node.getValue());
}
@Override
protected Long visitTimestampLiteral(TimestampLiteral node, ConnectorSession session)
{
return parseTimestamp(session.getTimeZoneKey(), node.getValue());
}
@Override
protected Long visitIntervalLiteral(IntervalLiteral node, ConnectorSession session)
{
if (node.isYearToMonth()) {
return node.getSign().multiplier() * parseYearMonthInterval(node.getValue(), node.getStartField(), node.getEndField());
}
else {
return node.getSign().multiplier() * parseDayTimeInterval(node.getValue(), node.getStartField(), node.getEndField());
}
}
@Override
protected Object visitNullLiteral(NullLiteral node, ConnectorSession session)
{
return null;
}
}
}