com.bedatadriven.rebar.persistence.mapping.SingleColumnPropertyMapping.java Source code

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Here is the source code for com.bedatadriven.rebar.persistence.mapping.SingleColumnPropertyMapping.java

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/*
 * Copyright 2009-2010 BeDataDriven (alex@bedatadriven.com)
 *
 * 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.bedatadriven.rebar.persistence.mapping;

import com.bedatadriven.rebar.persistence.mapping.client.ClientSideGeneratedValue;
import org.json.JSONException;
import org.json.JSONStringer;

import javax.persistence.Column;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import java.util.Collections;
import java.util.List;

/**
 * Maps a single database column to an entity property.
 *
 * @author Alex Bertram
 */
public abstract class SingleColumnPropertyMapping extends PropertyMapping {

    private boolean id;
    private boolean autoincrement;
    private String columnName;

    protected SingleColumnPropertyMapping(MethodInfo getterMethod) {
        super(getterMethod);

        columnName = getName();

        // @Id annotation makes this field an id
        id = (getterMethod.getAnnotation(Id.class) != null);

        // define default values for the column
        updatable = !id;
        unique = id;

        // @GeneratedValue(strategy = GeneratedType.Auto)
        if (id) {
            ClientSideGeneratedValue generatedValue = getterMethod.getAnnotation(ClientSideGeneratedValue.class);
            if (generatedValue != null) {
                if (generatedValue.strategy() == GenerationType.AUTO) {
                    autoincrement = true;
                    insertable = false;
                }
            }
        }

        // @Column annotation -  insertable, updateable etc
        Column column = getterMethod.getAnnotation(Column.class);
        if (column != null) {
            insertable = !autoincrement && column.insertable();
            updatable = !id && column.updatable();
            nullable = !id && column.nullable();
            unique = id || column.unique();

            if (column.name() != null && column.name().length() != 0) {
                columnName = column.name();
            }
        }
    }

    @Override
    public List<ColumnMapping> getColumns() {
        return Collections.singletonList(new ColumnMapping(columnName, getSqlTypeName(), getStmtSetter()));
    }

    @Override
    public boolean isId() {
        return id;
    }

    @Override
    public boolean isAutoincrement() {
        return autoincrement;
    }

    protected abstract SqliteTypes getSqlTypeName();

    protected abstract String getStmtSetter();

    @Override
    public void writeColumnValues(JSONStringer writer, Object entity) throws JSONException {
        writer.value(getValue(entity));
    }

}