com.porvak.bracket.social.jdbc.versioned.SqlDatabaseChange.java Source code

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Here is the source code for com.porvak.bracket.social.jdbc.versioned.SqlDatabaseChange.java

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/*
 * Copyright 2010 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.porvak.bracket.social.jdbc.versioned;

import org.springframework.core.io.Resource;
import org.springframework.core.io.support.EncodedResource;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.LineNumberReader;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

public class SqlDatabaseChange extends AbstractDatabaseChange {

    private final String sql;

    public SqlDatabaseChange(String sql) {
        this.sql = sql;
    }

    @Override
    protected Statement doCreateStatement(Connection connection) throws SQLException {
        return connection.createStatement();
    }

    @Override
    protected void doExecuteStatement(Statement statement) throws SQLException {
        statement.execute(sql);
    }

    public static DatabaseChange inResource(Resource resource) {
        try {
            return new SqlDatabaseChange(readScript(resource));
        } catch (IOException e) {
            throw new IllegalArgumentException("Could not read sql resource: " + resource, e);
        }
    }

    // TODO this code is duplicated from ResourceDatabasePopulator as well
    private static String readScript(Resource resource) throws IOException {
        EncodedResource encoded = resource instanceof EncodedResource ? (EncodedResource) resource
                : new EncodedResource(resource);
        LineNumberReader lnr = new LineNumberReader(encoded.getReader());
        String currentStatement = lnr.readLine();
        StringBuilder scriptBuilder = new StringBuilder();
        while (currentStatement != null) {
            if (StringUtils.hasText(currentStatement)
                    && (SQL_COMMENT_PREFIX != null && !currentStatement.startsWith(SQL_COMMENT_PREFIX))) {
                if (scriptBuilder.length() > 0) {
                    scriptBuilder.append('\n');
                }
                scriptBuilder.append(currentStatement);
            }
            currentStatement = lnr.readLine();
        }
        return scriptBuilder.toString();
    }

    private static final String SQL_COMMENT_PREFIX = "--";
}