com.github.drinkjava2.jdialects.id.TableIdGenerator Maven / Gradle / Ivy

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/*
 * Copyright 2016 the original author or 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 com.github.drinkjava2.jdialects.id;

import com.github.drinkjava2.jdbpro.NormalJdbcTool;
import com.github.drinkjava2.jdialects.Dialect;
import com.github.drinkjava2.jdialects.Type;
import com.github.drinkjava2.jdialects.annotation.jpa.GenerationType;

/**
 * The platform-independent table model
 * 
 * @author Yong Zhu
 * @since 1.0.2
 */
public class TableIdGenerator implements IdGenerator {

	/**
	 * A unique generator name that can be referenced by one or more classes to be
	 * the generator for id values.
	 */
	private String name;

	/**
	 * Table name in database
	 */
	private String table;

	/**
	 * Name of the primary key column in the table.
	 */
	private String pkColumnName = "";

	/**
	 * Name of the column that stores the last value generated.
	 */
	private String valueColumnName = "";

	/**
	 * The primary key value in the generator table that distinguishes this set of
	 * generated values from others that may be stored in the table.
	 */
	private String pkColumnValue = "";

	/**
	 * The initial value to be used when allocating id numbers from the generator.
	 */
	private Integer initialValue = 0;

	/**
	 * The amount to increment by when allocating id numbers from the generator.
	 */
	private Integer allocationSize = 50;

	public TableIdGenerator() {
		super();
	}

	public TableIdGenerator(String name, String table, String pkColumnName, String valueColumnName,
			String pkColumnValue, Integer initialValue, Integer allocationSize) {
		this.name = name;
		this.table = table;
		this.pkColumnName = pkColumnName;
		this.valueColumnName = valueColumnName;
		this.pkColumnValue = pkColumnValue;
		this.initialValue = initialValue;
		this.allocationSize = allocationSize;
	}

	@Override
	public IdGenerator newCopy() {
		return new TableIdGenerator(name, table, pkColumnName, valueColumnName, pkColumnValue, initialValue,
				allocationSize);
	}

	@Override
	public GenerationType getGenerationType() {
		return GenerationType.TIMESTAMP;
	}

	@Override
	public String getIdGenName() {
		return name;
	}

	@Override
	public Boolean dependOnAutoIdGenerator() {
		return false;
	}

	/**
	 * Get the next Table Generator ID
	 */
	@Override
	public Object getNextID(NormalJdbcTool jdbc, Dialect dialect, Type dataType) {
		int countOfRec = ((Number) jdbc // NOSONAR
				.nQueryForObject("select count(*) from " + table + " where " + pkColumnName + "=?", pkColumnValue))
						.intValue();
		if (countOfRec == 0) {
			jdbc.nUpdate("insert into " + table + "( " + pkColumnName + "," + valueColumnName + " )  values(?,?)",
					pkColumnValue, initialValue);
			return initialValue;
		} else {
			jdbc.nUpdate("update " + table + " set " + valueColumnName + "=" + valueColumnName + "+" + allocationSize
					+ "  where " + pkColumnName + " =?", pkColumnValue);

			int last = ((Number) jdbc.nQueryForObject( // NOSONAR
					"select " + valueColumnName + " from " + table + " where " + pkColumnName + "=?", pkColumnValue))
							.intValue();
			return last;
		}
	}

	// getter && setter=====================
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getTable() {
		return table;
	}

	public void setTable(String table) {
		this.table = table;
	}

	public String getPkColumnName() {
		return pkColumnName;
	}

	public void setPkColumnName(String pkColumnName) {
		this.pkColumnName = pkColumnName;
	}

	public String getValueColumnName() {
		return valueColumnName;
	}

	public void setValueColumnName(String valueColumnName) {
		this.valueColumnName = valueColumnName;
	}

	public String getPkColumnValue() {
		return pkColumnValue;
	}

	public void setPkColumnValue(String pkColumnValue) {
		this.pkColumnValue = pkColumnValue;
	}

	public Integer getInitialValue() {
		return initialValue;
	}

	public void setInitialValue(Integer initialValue) {
		this.initialValue = initialValue;
	}

	public Integer getAllocationSize() {
		return allocationSize;
	}

	public void setAllocationSize(Integer allocationSize) {
		this.allocationSize = allocationSize;
	}
}