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codegen module for querydsl
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/*
 * Copyright 2011, Mysema Ltd
 *
 * 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 com.mysema.query.codegen;

import javax.inject.Inject;
import javax.inject.Named;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.util.Collection;

import com.mysema.codegen.CodeWriter;
import com.mysema.codegen.model.ClassType;
import com.mysema.codegen.model.Type;
import com.mysema.codegen.model.TypeCategory;
import com.mysema.codegen.model.Types;
import com.mysema.query.types.Path;
import com.mysema.query.types.path.*;
import static com.mysema.codegen.Symbols.UNCHECKED;

/**
 * EmbeddableSerializer is a {@link Serializer} implementation for embeddable types
 *
 * @author tiwe
 *
 */
public final class EmbeddableSerializer extends EntitySerializer {

    /**
     * Create a new EmbeddableSerializer instance
     *
     * @param typeMappings
     * @param keywords
     */
    @Inject
    public EmbeddableSerializer(TypeMappings typeMappings, @Named("keywords") Collection keywords) {
        super(typeMappings, keywords);
    }

    @Override
    @SuppressWarnings(UNCHECKED)
    protected void introClassHeader(CodeWriter writer, EntityType model) throws IOException {
        Type queryType = typeMappings.getPathType(model, model, true);

        TypeCategory category = model.getOriginalCategory();
        Class pathType;
        if (model.getProperties().isEmpty() ) {
            switch(category) {
                case COMPARABLE : pathType = ComparablePath.class; break;
                case ENUM: pathType = EnumPath.class; break;
                case DATE: pathType = DatePath.class; break;
                case DATETIME: pathType = DateTimePath.class; break;
                case TIME: pathType = TimePath.class; break;
                case NUMERIC: pathType = NumberPath.class; break;
                case STRING: pathType = StringPath.class; break;
                case BOOLEAN: pathType = BooleanPath.class; break;
                default : pathType = BeanPath.class;
            }
        } else {
            pathType = BeanPath.class;
        }

        for (Annotation annotation : model.getAnnotations()) {
            writer.annotation(annotation);
        }

        writer.line("@Generated(\"", getClass().getName(), "\")");

        if (category == TypeCategory.BOOLEAN || category == TypeCategory.STRING) {
            writer.beginClass(queryType, new ClassType(pathType));
        } else {
            writer.beginClass(queryType, new ClassType(category, pathType, model));
        }

        // TODO : generate proper serialVersionUID here
        writer.privateStaticFinal(Types.LONG_P, "serialVersionUID", model.hashCode() + "L");
    }

}