com.hazelcast.org.apache.calcite.linq4j.tree.MemberExpression 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.Field;
import java.lang.reflect.Modifier;
import java.util.Objects;
/**
* Represents accessing a field or property.
*/
public class MemberExpression extends Expression {
public final @Nullable Expression expression;
public final PseudoField field;
public MemberExpression(Expression expression, Field field) {
this(expression, Types.field(field));
}
public MemberExpression(@Nullable Expression expression, PseudoField field) {
super(ExpressionType.MemberAccess, field.getType());
assert field != null : "field should not be null";
assert expression != null || Modifier.isStatic(field.getModifiers())
: "must specify expression if field is not static";
this.expression = expression;
this.field = field;
}
@Override public Expression accept(Shuttle shuttle) {
shuttle = shuttle.preVisit(this);
Expression expression1 = expression == null
? null
: expression.accept(shuttle);
return shuttle.visit(this, expression1);
}
@Override public R accept(Visitor visitor) {
return visitor.visit(this);
}
@Override public @Nullable Object evaluate(Evaluator evaluator) {
final Object o = expression == null
? null
: expression.evaluate(evaluator);
try {
return field.get(o);
} catch (IllegalAccessException e) {
throw new RuntimeException("error while evaluating " + this, e);
}
}
@Override void accept(ExpressionWriter writer, int lprec, int rprec) {
if (writer.requireParentheses(this, lprec, rprec)) {
return;
}
if (expression != null) {
expression.accept(writer, lprec, nodeType.lprec);
} else {
assert (field.getModifiers() & Modifier.STATIC) != 0;
writer.append(field.getDeclaringClass());
}
writer.append('.').append(field.getName());
}
@Override public boolean equals(@Nullable Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
if (!super.equals(o)) {
return false;
}
MemberExpression that = (MemberExpression) o;
if (expression != null ? !expression.equals(that.expression) : that
.expression != null) {
return false;
}
if (!field.equals(that.field)) {
return false;
}
return true;
}
@Override public int hashCode() {
return Objects.hash(nodeType, type, expression, field);
}
}
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