/*
* Copyright 2011 JBoss, by Red Hat, Inc
*
* 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 org.jboss.errai.codegen;
import org.jboss.errai.codegen.builder.callstack.LoadClassReference;
import org.jboss.errai.codegen.exception.InvalidTypeException;
import org.jboss.errai.codegen.meta.MetaClass;
import org.jboss.errai.codegen.meta.MetaClassFactory;
import org.jboss.errai.common.client.api.Assert;
import org.mvel2.util.NullType;
/**
* Implements code generation of type casting statements.
*
* @author Mike Brock <cbrock@redhat.com>
* @author Christian Sadilek <csadilek@redhat.com>
* @author Jonathan Fuerth <jfuerth@redhat.com>
*/
public class Cast implements Statement {
private final MetaClass toType;
private final Statement statement;
private Cast(final MetaClass toType,
final Statement statement) {
this.toType = Assert.notNull(toType);
this.statement = statement;
}
public static Statement to(final Class<?> cls,
final Statement stmt) {
return to(MetaClassFactory.get(cls), stmt);
}
public static Cast to(final MetaClass cls,
final Statement stmt) {
return new Cast(cls, stmt);
}
@Override
public String generate(final Context context) {
final String stmt = statement.generate(context);
if (!toType.isPrimitive() && !toType.isAssignableFrom(statement.getType())
&& !toType.isAssignableTo(statement.getType()) && !toType.isInterface()
&& !statement.getType().asBoxed().equals(toType)) {
if (context.isPermissiveMode()) {
return "(" + LoadClassReference.getClassReference(toType, context) + ") " + stmt;
}
else {
throw new InvalidTypeException(statement.getType() + " cannot be cast to " + toType);
}
}
else if (toType.isAssignableFrom(statement.getType()) && !statement.getType().equals(MetaClassFactory.get(NullType.class))) {
return stmt;
}
else {
return "(" + LoadClassReference.getClassReference(toType, context) + ") " + stmt;
}
}
@Override
public MetaClass getType() {
return toType;
}
@Override
public String toString() {
return "((" + toType.getFullyQualifiedName() + ")" + statement.toString() + ")";
}
}