com.hazelcast.org.apache.calcite.linq4j.tree.ParameterExpression 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 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.hazelcast.org.apache.calcite.linq4j.tree;
import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Represents a named parameter expression.
*/
public class ParameterExpression extends Expression {
private static final AtomicInteger SEQ = new AtomicInteger();
public final int modifier;
public final String name;
public ParameterExpression(Type type) {
this(0, type, "p" + SEQ.getAndIncrement());
}
public ParameterExpression(int modifier, Type type, String name) {
super(ExpressionType.Parameter, type);
assert name != null : "name should not be null";
assert Character.isJavaIdentifierStart(name.charAt(0))
: "parameter name should be valid java identifier: "
+ name + ". The first character is invalid.";
this.modifier = modifier;
this.name = name;
}
@Override public Expression accept(Shuttle shuttle) {
return shuttle.visit(this);
}
@Override public R accept(Visitor visitor) {
return visitor.visit(this);
}
@Override public @Nullable Object evaluate(Evaluator evaluator) {
return evaluator.peek(this);
}
@Override void accept(ExpressionWriter writer, int lprec, int rprec) {
writer.append(name);
}
String declString() {
return declString(type);
}
String declString(Type type) {
final String modifiers = Modifier.toString(modifier);
return modifiers + (modifiers.isEmpty() ? "" : " ") + Types.className(type)
+ " " + name;
}
@Override public boolean equals(@Nullable Object o) {
return this == o;
}
@Override public int hashCode() {
return System.identityHashCode(this);
}
}
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