/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.painless.node;
import org.elasticsearch.painless.Definition;
import org.elasticsearch.painless.Definition.Type;
import org.elasticsearch.painless.Globals;
import org.elasticsearch.painless.Locals;
import org.elasticsearch.painless.Location;
import org.elasticsearch.painless.MethodWriter;
import java.util.Objects;
import java.util.Set;
/**
* Represents {@code instanceof} operator.
* <p>
* Unlike java's, this works for primitive types too.
*/
public final class EInstanceof extends AExpression {
private AExpression expression;
private final String type;
private Class<?> resolvedType;
private Class<?> expressionType;
private boolean primitiveExpression;
public EInstanceof(Location location, AExpression expression, String type) {
super(location);
this.expression = Objects.requireNonNull(expression);
this.type = Objects.requireNonNull(type);
}
@Override
void extractVariables(Set<String> variables) {
expression.extractVariables(variables);
}
@Override
void analyze(Locals locals) {
final Type type;
// ensure the specified type is part of the definition
try {
type = locals.getDefinition().getType(this.type);
} catch (IllegalArgumentException exception) {
throw createError(new IllegalArgumentException("Not a type [" + this.type + "]."));
}
// map to wrapped type for primitive types
resolvedType = type.sort.primitive ? type.sort.boxed : type.clazz;
// analyze and cast the expression
expression.analyze(locals);
expression.expected = expression.actual;
expression = expression.cast(locals);
// record if the expression returns a primitive
primitiveExpression = expression.actual.sort.primitive;
// map to wrapped type for primitive types
expressionType = expression.actual.sort.primitive ? expression.actual.sort.boxed : type.clazz;
actual = Definition.BOOLEAN_TYPE;
}
@Override
void write(MethodWriter writer, Globals globals) {
// primitive types
if (primitiveExpression) {
// run the expression anyway (who knows what it does)
expression.write(writer, globals);
// discard its result
writer.writePop(expression.actual.type.getSize());
// push our result: its a primitive so it cannot be null.
writer.push(resolvedType.isAssignableFrom(expressionType));
} else {
// ordinary instanceof
expression.write(writer, globals);
writer.instanceOf(org.objectweb.asm.Type.getType(resolvedType));
}
}
@Override
public String toString() {
return singleLineToString(expression, type);
}
}