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package org.apidesign.livedb.impl;
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import java.io.IOException;
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import java.io.Writer;
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import java.sql.CallableStatement;
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import java.sql.Connection;
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import java.sql.Driver;
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import java.sql.ResultSet;
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import java.sql.ResultSetMetaData;
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import java.sql.SQLException;
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import java.util.Properties;
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import java.util.ServiceLoader;
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import java.util.Set;
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import javax.annotation.processing.AbstractProcessor;
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import javax.annotation.processing.Filer;
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import javax.annotation.processing.Processor;
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import javax.annotation.processing.RoundEnvironment;
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import javax.annotation.processing.SupportedAnnotationTypes;
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import javax.annotation.processing.SupportedSourceVersion;
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import javax.lang.model.SourceVersion;
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import javax.lang.model.element.Element;
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import javax.lang.model.element.PackageElement;
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import javax.lang.model.element.TypeElement;
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import javax.tools.JavaFileObject;
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import org.apidesign.livedb.LiveDB;
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import org.openide.util.lookup.ServiceProvider;
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/**
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*
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* @author Jaroslav Tulach <jtulach@netbeans.org>
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*/
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// BEGIN: livedb.processor
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@SupportedAnnotationTypes("org.apidesign.livedb.LiveDB")
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@SupportedSourceVersion(SourceVersion.RELEASE_6)
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@ServiceProvider(service=Processor.class)
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public final class LiveDBProcessor extends AbstractProcessor {
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@Override
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public boolean process(
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Set<? extends TypeElement> annotations, RoundEnvironment roundEnv
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) {
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final Filer filer = processingEnv.getFiler();
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for (Element e : roundEnv.getElementsAnnotatedWith(LiveDB.class)) {
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LiveDB db = e.getAnnotation(LiveDB.class);
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PackageElement pe = (PackageElement)e;
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String clsName = pe.getQualifiedName() + "." + db.classname();
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try {
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JavaFileObject src = filer.createSourceFile(clsName, pe);
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Writer w = src.openWriter();
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Connection c = getConnection(
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db.url(), db.user(), db.password()
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);
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CallableStatement s = c.prepareCall(db.query());
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ResultSet rs = s.executeQuery();
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ResultSetMetaData md = rs.getMetaData();
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generateClassHeader(w, pe, db);
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w.append("class " + db.classname() + " {\n");
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for (int i = 1; i <= md.getColumnCount(); i++) {
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generateField(w, md, i);
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}
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generateConstructor(w, db, md);
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generateQueryMethod(w, db, md);
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w.append("}");
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w.close();
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} catch (IOException ex) {
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throw new IllegalStateException(ex);
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} catch (SQLException ex) {
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throw new IllegalStateException(ex);
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}
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}
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return true;
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}
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// FINISH: livedb.processor
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private void generateQueryMethod(Writer w, LiveDB db, ResultSetMetaData md) throws SQLException, IOException {
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w.append(" public static List<" + db.classname() + "> ")
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.append("query() throws SQLException {\n");
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w.append(" Connection c = DriverManager.getConnection(\"")
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.append(db.url()).append("\", \"")
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.append(db.user()).append("\", \"")
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.append(db.password()).append("\");\n");
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w.append(" List<").append(db.classname())
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.append("> res = new ArrayList<")
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.append(db.classname()).append(">();\n");
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w.append(" CallableStatement s = c.prepareCall(\"")
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.append(db.query()).append("\");\n");
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w.append(" ResultSet rs = s.executeQuery();\n");
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w.append(" ResultSetMetaData md = rs.getMetaData();\n");
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w.append(" while (rs.next()) {\n");
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w.append(" res.add(new " + db.classname() + "(\n");
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for (int i = 1; i <= md.getColumnCount(); i++) {
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w.append(" (")
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.append(md.getColumnClassName(i))
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.append(")rs.getObject(" + i).append(")");
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if (i < md.getColumnCount()) {
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w.append(",\n");
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} else {
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w.append("\n");
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}
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}
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w.append(" ));\n");
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w.append(" };\n");
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w.append(" return res;\n");
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w.append(" }");
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}
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private void generateConstructor(Writer w, LiveDB db, ResultSetMetaData md) throws SQLException, IOException {
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w.append(" private " + db.classname() + "(\n");
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for (int i = 1; i <= md.getColumnCount(); i++) {
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w.append(" ").append(md.getColumnClassName(i))
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.append(" ").append(md.getColumnName(i));
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if (i < md.getColumnCount()) {
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w.append(",\n");
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} else {
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w.append("\n");
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}
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}
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w.append(" ) {\n");
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for (int i = 1; i <= md.getColumnCount(); i++) {
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w.append(" this.")
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.append(md.getColumnName(i))
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.append(" = ")
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.append(md.getColumnName(i))
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.append(";\n");
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}
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w.append(" }\n");
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}
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private void generateField(Writer w, ResultSetMetaData md, int i) throws IOException, SQLException {
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w.append(" public final ")
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.append(md.getColumnClassName(i))
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.append(" ")
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.append(md.getColumnName(i))
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.append(";\n");
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}
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private void generateClassHeader(Writer w, PackageElement pe, LiveDB db) throws IOException {
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w.append("package " + pe.getQualifiedName() + ";\n");
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w.append("import java.util.List;\n");
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w.append("import java.util.ArrayList;\n");
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w.append("import java.sql.*;\n");
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}
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private static Connection getConnection(String url, String user, String password)
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throws SQLException {
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final ClassLoader cl = LiveDBProcessor.class.getClassLoader();
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for (Driver d : ServiceLoader.load(Driver.class, cl)) {
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// System.out.println("looked up: " + d);
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if (d.acceptsURL(url)) {
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//System.out.println("accepts: " + d);
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Properties p = new Properties();
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p.put("user", user);
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p.put("password", password);
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return d.connect(url, p);
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}
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}
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throw new SQLException("No driver found for " + url);
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}
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}
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