/*
* Copyright (C) 2011 Red Hat, Inc. and/or its affiliates.
*
* 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.builder.impl;
import static org.jboss.errai.codegen.CallParameters.fromStatements;
import java.util.Arrays;
import javax.enterprise.util.TypeLiteral;
import org.jboss.errai.codegen.CallParameters;
import org.jboss.errai.codegen.Context;
import org.jboss.errai.codegen.Statement;
import org.jboss.errai.codegen.Variable;
import org.jboss.errai.codegen.builder.AnonymousClassStructureBuilder;
import org.jboss.errai.codegen.builder.BuildCallback;
import org.jboss.errai.codegen.builder.StatementEnd;
import org.jboss.errai.codegen.builder.callstack.DeferredCallElement;
import org.jboss.errai.codegen.builder.callstack.LoadClassReference;
import org.jboss.errai.codegen.exception.InvalidTypeException;
import org.jboss.errai.codegen.exception.UndefinedConstructorException;
import org.jboss.errai.codegen.meta.MetaClass;
import org.jboss.errai.codegen.meta.MetaClassFactory;
import org.jboss.errai.codegen.util.GenUtil;
/**
* @author Mike Brock <cbrock@redhat.com>
* @author Christian Sadilek <csadilek@redhat.com>
*/
public class ObjectBuilder extends AbstractStatementBuilder {
private final MetaClass type;
private Object[] parameters;
private Statement extendsBlock;
private final RuntimeException blame = new RuntimeException("Problem was caused by this call");
ObjectBuilder(final MetaClass type, final Context context, final CallElementBuilder callElementBuilder) {
super(context, callElementBuilder);
if (context != null) {
context.attachClass(type);
Arrays.stream(type.getDeclaredFields()).
forEach(f -> context.addVariable(Variable.create(f.getName(), f.getType())));
}
this.type = type;
}
ObjectBuilder(final MetaClass type, final Context context) {
this(type, context, new CallElementBuilder());
}
ObjectBuilder(final MetaClass type) {
this(type, Context.create(), new CallElementBuilder());
}
public static ObjectBuilder newInstanceOf(final MetaClass type) {
return new ObjectBuilder(type);
}
public static ObjectBuilder newInstanceOf(final Class<?> type) {
return newInstanceOf(MetaClassFactory.get(type));
}
public static ObjectBuilder newInstanceOf(final TypeLiteral<?> type) {
return newInstanceOf(MetaClassFactory.get(type));
}
public static ObjectBuilder newInstanceOf(final MetaClass type, final Context context) {
return new ObjectBuilder(type, context);
}
public static ObjectBuilder newInstanceOf(final Class<?> type, final Context context) {
return newInstanceOf(MetaClassFactory.get(type), context);
}
public static ObjectBuilder newInstanceOf(final TypeLiteral<?> type, final Context context) {
return newInstanceOf(MetaClassFactory.get(type), context);
}
public static ObjectBuilder newInstanceOf(final MetaClass type, final Context context, final CallElementBuilder callElementBuilder) {
return new ObjectBuilder(type, context, callElementBuilder);
}
public static ObjectBuilder newInstanceOf(final Class<?> type, final Context context, final CallElementBuilder callElementBuilder) {
return newInstanceOf(MetaClassFactory.get(type), context, callElementBuilder);
}
public static ObjectBuilder newInstanceOf(final TypeLiteral<?> type, final Context context, final CallElementBuilder callElementBuilder) {
return newInstanceOf(MetaClassFactory.get(type), context, callElementBuilder);
}
public StatementEnd withParameters(final Object... parameters) {
this.parameters = parameters;
return this;
}
public AnonymousClassStructureBuilder extend() {
return new AnonymousClassStructureBuilderImpl(type, new BuildCallback<ObjectBuilder>() {
@Override
public ObjectBuilder callback(final Statement statement) {
extendsBlock = statement;
return ObjectBuilder.this;
}
@Override
public Context getParentContext() {
return context;
}
});
}
public AnonymousClassStructureBuilder extend(final Object... parameters) {
this.parameters = parameters;
return extend();
}
@Override
public MetaClass getType() {
return type;
}
@Override
public String generate(final Context context) {
if (!generated) {
appendCallElement(new DeferredCallElement((writer, context1, statement) -> {
if (extendsBlock == null && (type.isAbstract() || type.isInterface() || type.isPrimitive()))
throw new InvalidTypeException("Cannot instantiate type:" + type, blame);
writer.reset();
final CallParameters callParameters = (parameters != null) ?
fromStatements(GenUtil.generateCallParameters(context1, parameters)) : CallParameters.none();
if (!type.isInterface() && type.getBestMatchingConstructor(callParameters.getParameterTypes()) == null) {
if (context1.isPermissiveMode()) {
// fall-through
}
else {
throw new UndefinedConstructorException(type, blame, callParameters.getParameterTypes());
}
}
final StringBuilder buf = new StringBuilder();
buf.append("new ").append(LoadClassReference.getClassReference(type, context1, true));
if (callParameters != null) {
buf.append(callParameters.generate(Context.create(context1)));
}
if (extendsBlock != null) {
Arrays.stream(type.getDeclaredFields())
.forEach(field -> context1.addVariable(Variable.create(field.getName(), field.getType())));
buf.append(" {\n").append(extendsBlock.generate(context1)).append("\n}\n");
}
writer.append(buf.toString());
}));
}
try {
return super.generate(context);
}
catch (final Throwable t) {
GenUtil.throwIfUnhandled("while instantiating class: " + type.getFullyQualifiedName(), t);
return null;
}
}
}