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

Go to download
Show more of this group Show more artifacts with this name
Show all versions of processor Show documentation
droitatedDB is a lightweight framework, which frees you from the burden of dealing with Androids SQLite database directly if you don't want to and let's you access it directly if you have to.
The newest version!
/*
 * 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");
    }

}