implement database delegate abstraction for ScriptUtils

modules/database-commons/pom.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.testcontainers</groupId>
+        <artifactId>testcontainers-parent</artifactId>
+        <version>0-SNAPSHOT</version>
+        <relativePath>../../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>database-commons</artifactId>
+    <name>TestContainers :: Database-Commons</name>
+
+    <dependencies>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>testcontainers</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+    </dependencies>
+
+</project>

modules/database-commons/src/main/java/org/testcontainers/delegate/AbstractDatabaseDelegate.java

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+package org.testcontainers.delegate;
+
+import java.util.Collection;
+
+/**
+ * @param <CONNECTION> connection to the database
+ * @author Eugeny Karpov
+ */
+public abstract class AbstractDatabaseDelegate<CONNECTION> implements DatabaseDelegate {
+
+    /**
+     * Database connection
+     */
+    private CONNECTION connection;
+
+    private boolean isConnectionStarted = false;
+
+    /**
+     * Get or create new connection to the database
+     */
+    protected CONNECTION getConnection() {
+        if (!isConnectionStarted) {
+            connection = createNewConnection();
+            isConnectionStarted = true;
+        }
+        return connection;
+    }
+
+    @Override
+    public void execute(Collection<String> statements, String scriptPath, boolean continueOnError, boolean ignoreFailedDrops) {
+        int lineNumber = 0;
+        for (String statement : statements) {
+            lineNumber++;
+            execute(statement, scriptPath, lineNumber, continueOnError, ignoreFailedDrops);
+        }
+    }
+
+    @Override
+    public void close() {
+        if (isConnectionStarted) {
+            closeConnectionQuietly(connection);
+            isConnectionStarted = false;
+        }
+    }
+
+    /**
+     * Quietly close the connection
+     */
+    protected abstract void closeConnectionQuietly(CONNECTION connection);
+
+    /**
+     * Template method for creating new connections to the database
+     */
+    protected abstract CONNECTION createNewConnection();
+}

modules/database-commons/src/main/java/org/testcontainers/delegate/DatabaseDelegate.java

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+package org.testcontainers.delegate;
+
+import java.util.Collection;
+
+/**
+ * Database delegate
+ *
+ * Gives an abstraction from concrete database
+ *
+ * @author Eugeny Karpov
+ */
+public interface DatabaseDelegate extends AutoCloseable {
+
+    /**
+     * Execute statement by the implementation of the delegate
+     */
+    void execute(String statement, String scriptPath, int lineNumber, boolean continueOnError, boolean ignoreFailedDrops);
+
+    /**
+     * Execute collection of statements
+     */
+    void execute(Collection<String> statements, String scriptPath, boolean continueOnError, boolean ignoreFailedDrops);
+
+    /**
+     * Close connection to the database
+     *
+     * Overridden to suppress throwing Exception
+     */
+    @Override
+    void close();
+}

modules/database-commons/src/main/java/org/testcontainers/exception/ConnectionCreationException.java

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+package org.testcontainers.exception;
+
+/**
+ * Inability to create connection to the database
+ *
+ * @author Eugeny Karpov
+ */
+public class ConnectionCreationException extends RuntimeException {
+
+    public ConnectionCreationException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}