org.springframework.cloud.stream.app.jdbc.sink.DefaultInitializationScriptResource.java Source code

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Here is the source code for org.springframework.cloud.stream.app.jdbc.sink.DefaultInitializationScriptResource.java

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/*
 * Copyright 2015 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 org.springframework.cloud.stream.app.jdbc.sink;

import java.nio.charset.Charset;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.core.io.ByteArrayResource;

/**
 * An in-memory script crafted for dropping-creating the table we're working with.
 * All columns are created as VARCHAR(2000).
 *
 * @author Eric Bottard
 */
public class DefaultInitializationScriptResource extends ByteArrayResource {

    private static final Log logger = LogFactory.getLog(DefaultInitializationScriptResource.class);

    public DefaultInitializationScriptResource(JdbcSinkProperties properties) {
        super(scriptFor(properties).getBytes(Charset.forName("UTF-8")));
    }

    private static String scriptFor(JdbcSinkProperties properties) {
        StringBuilder result = new StringBuilder("DROP TABLE ");
        result.append(properties.getTableName()).append(";\n\n");

        result.append("CREATE TABLE ").append(properties.getTableName()).append('(');
        int i = 0;
        for (String column : properties.getColumns().keySet()) {
            if (i++ > 0) {
                result.append(", ");
            }
            result.append(column).append(" VARCHAR(2000)");
        }
        result.append(");\n");
        logger.debug(String.format("Generated the following initializing script for table %s:\n%s",
                properties.getTableName(), result.toString()));
        return result.toString();
    }
}