/*
* Copyright (C) 2015 SoftIndex LLC.
*
* Licensed 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 io.datakernel.codegen;
import org.objectweb.asm.Type;
import org.objectweb.asm.commons.GeneratorAdapter;
import java.lang.reflect.Constructor;
import java.util.Arrays;
import java.util.List;
import static io.datakernel.codegen.Utils.*;
import static java.lang.String.format;
import static org.objectweb.asm.Type.getType;
import static org.objectweb.asm.commons.Method.getMethod;
/**
* Defines methods for using constructors from other classes
*/
final class ExpressionConstructor implements Expression {
private final Class<?> type;
private final List<Expression> fields;
ExpressionConstructor(Class<?> type, Expression... fields) {
this.type = type;
this.fields = Arrays.asList(fields);
}
ExpressionConstructor(Class<?> type, List<Expression> fields) {
this.type = type;
this.fields = fields;
}
@Override
public Type type(Context ctx) {
return getType(type);
}
@Override
public Type load(Context ctx) {
GeneratorAdapter g = ctx.getGeneratorAdapter();
Class<?>[] fieldTypes = new Class<?>[this.fields.size()];
Expression[] fieldVars = new Expression[this.fields.size()];
for (int i = 0; i < this.fields.size(); i++) {
Expression field = this.fields.get(i);
Type fieldType = field.type(ctx);
fieldTypes[i] = getJavaType(ctx.getClassLoader(), fieldType);
fieldVars[i] = field;
}
try {
Constructor<?> constructor = type.getConstructor(fieldTypes);
g.newInstance(getType(type));
g.dup();
for (Expression fieldVar : fieldVars) {
fieldVar.load(ctx);
}
g.invokeConstructor(getType(type), getMethod(constructor));
return getType(type);
} catch (NoSuchMethodException e) {
throw new RuntimeException(format("No constructor %s.<init>(%s). %s",
type.getName(),
(fieldTypes.length != 0 ? argsToString(fieldTypes) : ""),
exceptionInGeneratedClass(ctx)));
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
ExpressionConstructor that = (ExpressionConstructor) o;
if (fields != null ? !fields.equals(that.fields) : that.fields != null) return false;
if (type != null ? !type.equals(that.type) : that.type != null) return false;
return true;
}
@Override
public int hashCode() {
int result = type != null ? type.hashCode() : 0;
result = 31 * result + (fields != null ? fields.hashCode() : 0);
return result;
}
}