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/*
* 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 org.apache.calcite.linq4j.tree;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Objects;
/**
* Represents a call to either a static or an instance method.
*/
public class MethodCallExpression extends Expression {
public final Method method;
public final Expression targetExpression; // null for call to static method
public final List expressions;
/**
* Cache the hash code for the expression
*/
private int hash;
MethodCallExpression(Type returnType, Method method,
Expression targetExpression, List expressions) {
super(ExpressionType.Call, returnType);
assert expressions != null : "expressions should not be null";
assert method != null : "method should not be null";
assert (targetExpression == null) == Modifier.isStatic(
method.getModifiers());
assert Types.toClass(returnType) == method.getReturnType();
this.method = method;
this.targetExpression = targetExpression;
this.expressions = expressions;
}
MethodCallExpression(Method method, Expression targetExpression,
List expressions) {
this(method.getReturnType(), method, targetExpression, expressions);
}
@Override public Expression accept(Shuttle shuttle) {
shuttle = shuttle.preVisit(this);
Expression targetExpression = Expressions.accept(this.targetExpression,
shuttle);
List expressions = Expressions.acceptExpressions(
this.expressions, shuttle);
return shuttle.visit(this, targetExpression, expressions);
}
public R accept(Visitor visitor) {
return visitor.visit(this);
}
@Override public Object evaluate(Evaluator evaluator) {
final Object target;
if (targetExpression == null) {
target = null;
} else {
target = targetExpression.evaluate(evaluator);
}
final Object[] args = new Object[expressions.size()];
for (int i = 0; i < expressions.size(); i++) {
Expression expression = expressions.get(i);
args[i] = expression.evaluate(evaluator);
}
try {
return method.invoke(target, args);
} catch (IllegalAccessException | InvocationTargetException 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 (targetExpression != null) {
// instance method
targetExpression.accept(writer, lprec, nodeType.lprec);
} else {
// static method
writer.append(method.getDeclaringClass());
}
writer.append('.').append(method.getName()).append('(');
int k = 0;
for (Expression expression : expressions) {
if (k++ > 0) {
writer.append(", ");
}
expression.accept(writer, 0, 0);
}
writer.append(')');
}
@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;
}
MethodCallExpression that = (MethodCallExpression) o;
if (!expressions.equals(that.expressions)) {
return false;
}
if (!method.equals(that.method)) {
return false;
}
if (targetExpression != null ? !targetExpression.equals(that
.targetExpression) : that.targetExpression != null) {
return false;
}
return true;
}
@Override public int hashCode() {
int result = hash;
if (result == 0) {
result =
Objects.hash(nodeType, type, method, targetExpression, expressions);
if (result == 0) {
result = 1;
}
hash = result;
}
return result;
}
}
// End MethodCallExpression.java