/*
* 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.byteCode.expression;
import com.facebook.presto.byteCode.Block;
import com.facebook.presto.byteCode.ByteCodeNode;
import com.facebook.presto.byteCode.instruction.LabelNode;
import com.google.common.collect.ImmutableList;
import java.util.List;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
class InlineIfByteCodeExpression
extends ByteCodeExpression
{
private final ByteCodeExpression condition;
private final ByteCodeExpression ifTrue;
private final ByteCodeExpression ifFalse;
InlineIfByteCodeExpression(ByteCodeExpression condition, ByteCodeExpression ifTrue, ByteCodeExpression ifFalse)
{
super(ifTrue.getType());
this.condition = condition;
this.ifTrue = checkNotNull(ifTrue, "ifTrue is null");
this.ifFalse = checkNotNull(ifFalse, "ifFalse is null");
checkArgument(condition.getType().getPrimitiveType() == boolean.class, "Expected condition to be type boolean but is %s", condition.getType());
checkArgument(ifTrue.getType().equals(ifFalse.getType()), "Expected ifTrue and ifFalse to be the same type");
}
@Override
public ByteCodeNode getByteCode()
{
LabelNode falseLabel = new LabelNode("false");
LabelNode endLabel = new LabelNode("end");
return new Block(null)
.append(condition)
.ifFalseGoto(falseLabel)
.append(ifTrue)
.gotoLabel(endLabel)
.visitLabel(falseLabel)
.append(ifFalse)
.visitLabel(endLabel);
}
@Override
public List<ByteCodeNode> getChildNodes()
{
return ImmutableList.<ByteCodeNode>of(condition, ifTrue, ifFalse);
}
@Override
protected String formatOneLine()
{
return "(" + condition + " ? " + ifTrue + " : " + ifFalse + ")";
}
}