src.main.java.com.aceql.client.metadata.util.PythonClassDumper Maven / Gradle / Ivy

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The AceQL Java Client SDK allows to wrap the AceQL HTTP APIs and eliminate the tedious works of handling communications errors and parsing JSON results. Android and Java Desktop application developers can access remote SQL databases and/or SQL databases in the cloud by simply including standard JDBC calls in their code, just like they would for a local database.

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/**
 *
 */
package com.aceql.client.metadata.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.commons.lang3.StringUtils;

import com.aceql.client.metadata.Table;

/**
 * @author Nicolas de Pomereu
 *
 */
public class PythonClassDumper {

    private static final String PYTHON_HEADERS_FILE = "I:\\_dev_awake\\aceql-http-main\\aceql-http-client-sdk\\src\\main\\java\\com\\aceql\\client\\metadata\\util\\python_header.txt";
    private static final String FOUR_BLANKS = "    ";

    /**
     * @param args
     */
    public static void main(String[] args) throws Exception {
	System.out.println(new Date() + " Begin...");
	boolean printHeader = true;

	List> classes = new ArrayList>();
	/*
	classes.add(Column.class);
	classes.add(ExportedKey.class);
	classes.add(ForeignKey.class);
	classes.add(ImportedKey.class);
	classes.add(Index.class);
	classes.add(PrimaryKey.class);
	*/
	classes.add(Table.class);

	for (Class clazz : classes) {
	    System.out.println(new Date() + " " + clazz.getSimpleName());
	    try (PrintWriter out = new PrintWriter(new OutputStreamWriter(
		    new FileOutputStream("C:\\test\\pyhton\\" + clazz.getSimpleName().toLowerCase() + ".py")));) {
		printPythonClass(clazz, printHeader, out);
	    }

	}

	System.out.println(new Date() + " Done.");
    }

    /**
     * @param clazz
     * @param printHeader
     * @param out         TODO
     * @throws SecurityException
     * @throws IOException
     */
    private static void printPythonClass(Class clazz, boolean printHeader, PrintWriter out)
	    throws SecurityException, IOException {
	Field[] fields = clazz.getDeclaredFields();

	String header = FileUtils.readFileToString(new File(PYTHON_HEADERS_FILE), Charset.defaultCharset());
	out.println(header);
	/**
	 * from dataclasses import dataclass import marshmallow_dataclass
	 *
	 *
	 * @dataclass class JdbcDatabaseMetaData:
	 */
	out.println("from dataclasses import dataclass");
	out.println("from typing import Optional");
	out.println("import marshmallow_dataclass");
	out.println();
	out.println();
	out.println("@dataclass");
	out.println("class " + clazz.getSimpleName() + ":");

	/*
	 * Header getURL: str isReadOnly: bool allProceduresAreCallable: bool
	 * allTablesAreSelectable: bool
	 */
	if (printHeader) {
	    out.println(FOUR_BLANKS + "catalog: Optional[str]");
	    out.println(FOUR_BLANKS + "schema: Optional[str]");
	}

	List names = new ArrayList<>();

	for (Field field : fields) {
	    if (Modifier.isPublic(field.getModifiers())) {
		continue;
	    }

	    String type = field.getGenericType().getTypeName();
	    if (type.endsWith("String"))
		type = "Optional[str]";
	    if (type.equals("boolean"))
		type = "Optional[bool]";
	    if (type.equals("int"))
		type = "Optional[int]";
	    if (type.equals("short"))
		type = "Optional[int]";
	    if (type.equals("long") || type.equals("float"))
		type = "Optional[float]";

	    out.println(FOUR_BLANKS + field.getName() + ": " + type);
	    names.add(field.getName());

	}

	out.println();

	out.println(FOUR_BLANKS + "class Meta:");
	out.println(FOUR_BLANKS + FOUR_BLANKS + "ordered = True");

	out.println();

	/**
	 * def __str__(self): """ The string representation.""" return str(self.name) +
	 * ", " + str(self.buildings)
	 */
	out.println(FOUR_BLANKS + "def __str__(self):");
	out.println(FOUR_BLANKS + FOUR_BLANKS + "\"\"\" The string representation.\"\"\"");

	String stringValue = FOUR_BLANKS + FOUR_BLANKS + "return " + "\"" + clazz.getSimpleName() + " [";

	// Primary Keys : [PrimaryKey [tableName=user_login, columnName=username,
	// keySequence=1, primaryKeyName=user_login_pkey,
	// getCatalog()=, getSchema()=public]]

	for (String name : names) {
	    stringValue += name + "=\" + str(self." + name + ")" + " + \", ";
	}

	// stringValue = StringUtils.substringBeforeLast(stringValue, "+");
	stringValue = StringUtils.substringBeforeLast(stringValue, "+");
	stringValue += " + \"]\"";

	out.println(stringValue);
    }

}