com.hazelcast.org.apache.calcite.linq4j.tree.ConditionalExpression Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in com.hazelcast.com.liance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.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.hazelcast.org.apache.calcite.linq4j.tree;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Objects;
/**
* Represents an expression that has a conditional operator.
*
* With an odd number of expressions
* {c0, e0, c1, e1, ..., cn-1, en-1, en}
* represents "if (c0) e0 else if (c1) e1 ... else en";
* with an even number of expressions
* {c0, e0, c1, e1, ..., cn-1, en-1}
* represents
* "if (c0) e0 else if (c1) e1 ... else if (cn-1) en-1".
*
*/
public class ConditionalExpression extends AbstractNode {
final List expressionList;
public ConditionalExpression(List expressionList, Type type) {
super(ExpressionType.Conditional, type);
assert expressionList != null : "expressionList should not be null";
this.expressionList = expressionList;
}
public R accept(Visitor visitor) {
return visitor.visit(this);
}
@Override void accept(ExpressionWriter writer, int lprec, int rprec) {
for (int i = 0; i < expressionList.size(); i += 2) {
writer.append(i > 0 ? " else if (" : "if (")
.append(expressionList.get(i))
.append(") ")
.append(Blocks.toBlock(expressionList.get(i + 1)));
}
if (expressionList.size() % 2 == 1) {
writer.append(" else ")
.append(
Blocks.toBlock(expressionList.get(expressionList.size() - 1)));
}
}
@Override public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
if (!super.equals(o)) {
return false;
}
ConditionalExpression that = (ConditionalExpression) o;
if (!expressionList.equals(that.expressionList)) {
return false;
}
return true;
}
@Override public int hashCode() {
return Objects.hash(nodeType, type, expressionList);
}
}