org.droitateddb.builder.schema.writer.SchemaWriter Maven / Gradle / Ivy

Go to download
/*
 * Copyright (C) 2014 The droitated DB Authors
 *
 * 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.droitateddb.builder.schema.writer;

import org.droitateddb.builder.Constants;
import org.droitateddb.builder.schema.data.Association;
import org.droitateddb.builder.schema.data.Schema;
import org.droitateddb.builder.schema.data.Table;
import org.droitateddb.schema.AssociationType;
import org.droitateddb.schema.SchemaConstants;
import org.droitateddb.util.Pair;

import java.util.Collection;
import java.util.HashSet;

/**
 * @author Alexander Frank
 * @author Falk Appel
 */
public class SchemaWriter implements Writer {

    private final String packageName;
    private final String className;
    private final Schema schema;

    public SchemaWriter(final String packageName, final String className, final Schema schema) {
        this.packageName = packageName;
        this.className = className;
        this.schema = schema;
    }

    @Override
    public String write() {
        StringBuilder builder = new StringBuilder();
        Collection> toNAssociations = new HashSet>();

        addDeclaration(builder);
        addSchemaData(builder);
        addEntityInfos(builder);
        addTables(builder, toNAssociations);
        addToNAssociations(builder, toNAssociations);
        addEnd(builder);
        return builder.toString();
    }

    private void addDeclaration(final StringBuilder builder) {
        builder.append(Constants.GENERATED_COMMENT);
        builder.append("package ").append(packageName).append(";\n\n");
        builder.append("import org.droitateddb.schema.*;\n\n");
        builder.append("public interface ").append(className).append(" {\n\n");
    }

    private void addSchemaData(final StringBuilder builder) {
        builder.append(Constants.TAB).append(String.format(Constants.CONSTANT_STRING, SchemaConstants.DB_NAME, schema.getDbName()));
        addHook(builder, SchemaConstants.CREATE_HOOK, schema.getCreateHookClassName());
        addHook(builder, SchemaConstants.UPDATE_HOOK, schema.getUpdateHookClassName());

        builder.append(Constants.TAB).append(String.format(Constants.CONSTANT_INT, SchemaConstants.DB_VERSION, schema.getDbVersion()));
        builder.append("\n");
    }

    private void addHook(StringBuilder builder, String hookName, String hookClassName) {
        if (hookClassName != null && hookClassName.length() > 0) {
            builder.append(Constants.TAB).append(String.format(Constants.CONSTANT_STRING, hookName, hookClassName));
        }
    }

    private void addTables(final StringBuilder builder, final Collection> toNAssociations) {
        for (Table table : schema.getTables()) {
            TableWriter tableWriter = new TableWriter(Constants.TAB, table);
            builder.append(tableWriter.write());
            builder.append("\n");

            for (Association association : table.getAssociations()) {
                if (association.getCardinality().equals(AssociationType.TO_MANY)) {
                    String tableType = table.getEntityClassName();
                    String associatedType = association.getCanonicalTypeInEntity();
                    toNAssociations.add(new Pair(tableType, associatedType));
                }
            }
        }
    }

    private void addEntityInfos(final StringBuilder builder) {
        for (Table table : schema.getTables()) {
            EntityInfoWriter entityInfoWriter = new EntityInfoWriter(Constants.TAB, table);
            builder.append(entityInfoWriter.write());
        }
        builder.append("\n");
    }

    private void addToNAssociations(final StringBuilder builder, final Collection> toNAssociations) {
        for (Pair link : toNAssociations) {
            ToManyAssociationWriter toManyAssociationWriter = new ToManyAssociationWriter(Constants.TAB, link);
            builder.append(toManyAssociationWriter.write());
        }
    }

    private void addEnd(final StringBuilder builder) {
        builder.append("}\n");
    }

}