StringType.java

/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.portal.dao.orm.hibernate;

import com.liferay.portal.kernel.util.StringPool;

import java.io.Serializable;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import java.util.Objects;

import org.hibernate.engine.SessionImplementor;
import org.hibernate.type.StandardBasicTypes;
import org.hibernate.type.Type;
import org.hibernate.usertype.CompositeUserType;

/**
 * @author Brian Wing Shun Chan
 */
public class StringType implements CompositeUserType, Serializable {

	@Override
	public Object assemble(
		Serializable cached, SessionImplementor session, Object owner) {

		return cached;
	}

	@Override
	public Object deepCopy(Object obj) {
		return obj;
	}

	@Override
	public Serializable disassemble(Object value, SessionImplementor session) {
		return (Serializable)value;
	}

	@Override
	public boolean equals(Object x, Object y) {
		if (Objects.equals(x, y)) {
			return true;
		}
		else if (((x == null) || x.equals(StringPool.BLANK)) &&
				 ((y == null) || y.equals(StringPool.BLANK))) {

			return true;
		}
		else {
			return false;
		}
	}

	@Override
	public String[] getPropertyNames() {
		return new String[0];
	}

	@Override
	public Type[] getPropertyTypes() {
		return new Type[] {StandardBasicTypes.STRING};
	}

	@Override
	public Object getPropertyValue(Object component, int property) {
		return component;
	}

	@Override
	public int hashCode(Object x) {
		return x.hashCode();
	}

	@Override
	public boolean isMutable() {
		return false;
	}

	@Override
	public Object nullSafeGet(
			ResultSet rs, String[] names, SessionImplementor session,
			Object owner)
		throws SQLException {

		return StandardBasicTypes.STRING.nullSafeGet(rs, names, session, owner);
	}

	@Override
	public void nullSafeSet(
			PreparedStatement ps, Object target, int index,
			SessionImplementor session)
		throws SQLException {

		if (target instanceof String) {
			String targetString = (String)target;

			if (targetString.isEmpty()) {
				target = null;
			}
		}

		StandardBasicTypes.STRING.nullSafeSet(ps, target, index, session);
	}

	@Override
	public Object replace(
		Object original, Object target, SessionImplementor session,
		Object owner) {

		return original;
	}

	@Override
	public Class<String> returnedClass() {
		return String.class;
	}

	@Override
	public void setPropertyValue(Object component, int property, Object value) {
	}

}