/*
* 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.util;
import org.jboss.errai.codegen.Context;
import org.jboss.errai.codegen.Statement;
import org.jboss.errai.codegen.StringStatement;
import org.jboss.errai.codegen.Variable;
import org.jboss.errai.codegen.builder.BlockBuilder;
import org.jboss.errai.codegen.builder.ClassStructureBuilder;
import org.jboss.errai.codegen.builder.ContextualStatementBuilder;
import org.jboss.errai.codegen.builder.StatementEnd;
import org.jboss.errai.codegen.builder.impl.ClassBuilder;
import org.jboss.errai.codegen.meta.MetaClass;
import org.jboss.errai.codegen.meta.MetaClassFactory;
/**
* @author Mike Brock <cbrock@redhat.com>
*/
public class Implementations {
public static ClassStructureBuilder<?> implement(final Class<?> clazz) {
return ClassBuilder.define(clazz.getPackage().getName() + "." + clazz.getSimpleName() + "Impl")
.publicScope()
.implementsInterface(clazz)
.body();
}
public static ClassStructureBuilder<?> implement(final Class<?> clazz,
final String implClassName) {
return ClassBuilder.define(clazz.getPackage().getName() + "." + implClassName)
.publicScope()
.implementsInterface(clazz)
.body();
}
public static ClassStructureBuilder<?> implement(final Class<?> clazz,
final String implPackageName,
final String implClassName) {
return ClassBuilder.define(implPackageName + "." + implClassName)
.publicScope()
.implementsInterface(clazz)
.body();
}
/**
* Creates a builder for a new class that extends the given superclass. The
* new class being built will be in the same package as the given superclass.
*
* @param superclass
* The class that the class being built extends.
* @param implClassName
* The simple name (no package prefix) of the new class to be built.
*
* @return an instance of the {@link ClassStructureBuilder} for building the
* extended class
*/
public static ClassStructureBuilder<?> extend(final Class<?> superclass, final String implClassName) {
return ClassBuilder.define(superclass.getPackage().getName() + "." + implClassName, superclass)
.publicScope()
.body();
}
public static void autoInitializedField(final ClassStructureBuilder<?> builder,
final MetaClass type,
final String name,
final Class<?> implementation) {
autoInitializedField(builder, type, name, MetaClassFactory.get(implementation));
}
public static void autoInitializedField(final ClassStructureBuilder<?> builder,
final MetaClass type,
final String name,
MetaClass implementation) {
implementation = MetaClassFactory.parameterizedAs(implementation, type.getParameterizedType());
builder.privateField(name, type)
.initializesWith(Stmt.newObject(implementation)).finish();
}
public static StringBuilderBuilder newStringBuilder() {
return newStringBuilder(64);
}
public static StringBuilderBuilder newStringBuilder(final int length) {
final ContextualStatementBuilder statementBuilder
= Stmt.nestedCall(Stmt.newObject(StringBuilder.class).withParameters(length));
return new StringBuilderBuilder() {
@Override
public StringBuilderBuilder append(final Object statement) {
statementBuilder.invoke("append", statement);
return this;
}
String generatedCache;
@Override
public String generate(final Context context) {
if (generatedCache != null) return generatedCache;
return generatedCache = statementBuilder.generate(context);
}
@Override
public MetaClass getType() {
return statementBuilder.getType();
}
};
}
public static interface StringBuilderBuilder extends Statement {
public StringBuilderBuilder append(Object statement);
}
public static BlockBuilder<StatementEnd> autoForLoop(final String varName, final Statement value) {
return Stmt.for_(Stmt.declareVariable(int.class).named("i").initializeWith(0),
Bool.lessThan(Variable.get("i"), value),
new StringStatement(varName + "++", null));
}
}