[jOOQ/jOOQ#9043] Provide minimal internal implementation

jOOQ/src/main/java/org/jooq/Source.java

@@ -0,0 +1,148 @@
+/*
+ * 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.
+ *
+ * Other licenses:
+ * -----------------------------------------------------------------------------
+ * Commercial licenses for this work are available. These replace the above
+ * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
+ * database integrations.
+ *
+ * For more information, please visit: http://www.jooq.org/licenses
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ */
+package org.jooq;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.io.StringReader;
+import java.nio.charset.Charset;
+
+/**
+ * A source of text data.
+ * <p>
+ * [#8986] As of jOOQ 3.11, this is INTERNAL API and should not be used by
+ * users.
+ */
+@Internal
+public final class Source {
+
+    private final String      string;
+    private final byte[]      bytes;
+    private final String      charsetName;
+    private final Charset     charset;
+    private final Reader      reader;
+    private final InputStream inputStream;
+
+    private Source(
+        String string,
+        byte[] bytes,
+        String charsetName,
+        Charset charset,
+        Reader reader,
+        InputStream inputStream
+    ) {
+        this.string = string;
+        this.bytes = bytes;
+        this.charsetName = charsetName;
+        this.charset = charset;
+        this.reader = reader;
+        this.inputStream = inputStream;
+    }
+
+    /**
+     * Create a source from a string.
+     */
+    public static final Source of(String string) {
+        return new Source(string, null, null, null, null, null);
+    }
+
+    /**
+     * Create a source from binary data.
+     */
+    public static final Source of(byte[] bytes) {
+        return new Source(null, bytes, null, null, null, null);
+    }
+
+    /**
+     * Create a source from binary data using a specific character set.
+     */
+    public static final Source of(byte[] bytes, String charsetName) {
+        return new Source(null, bytes, charsetName, null, null, null);
+    }
+
+    /**
+     * Create a source from binary data using a specific character set.
+     */
+    public static final Source of(byte[] bytes, Charset charset) {
+        return new Source(null, bytes, null, charset, null, null);
+    }
+
+    /**
+     * Create a source from a reader.
+     */
+    public static final Source of(Reader reader) {
+        return new Source(null, null, null, null, reader, null);
+    }
+
+    /**
+     * Create a source from an input stream.
+     */
+    public static final Source of(InputStream inputStream) {
+        return new Source(null, null, null, null, null, inputStream);
+    }
+
+    /**
+     * Produce a reader from this source.
+     *
+     * @throws IOException If something went wrong producing the reader.
+     */
+    public final Reader reader() throws IOException {
+        if (string != null)
+            return new StringReader(string);
+        else if (bytes != null)
+            return inputStreamReader(new ByteArrayInputStream(bytes));
+        else if (reader != null)
+            return reader;
+        else if (inputStream != null)
+            return inputStreamReader(inputStream);
+        else
+            throw new IllegalStateException("Could not produce a reader from this source");
+    }
+
+    private final Reader inputStreamReader(InputStream is) throws IOException {
+        if (charsetName != null)
+            return new InputStreamReader(is, charsetName);
+        else if (charset != null)
+            return new InputStreamReader(is, charset);
+        else
+            return new InputStreamReader(is);
+    }
+}