[GitHub] [commons-email] HiuKwok commented on a diff in pull request #135: EMAIL-204: Disable eager attachment loading on MimeMessageParser

["HiuKwok (via GitHub)" <gi...@apache.org>]

HiuKwok commented on code in PR #135:
URL: https://github.com/apache/commons-email/pull/135#discussion_r1125353219


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src/main/java/org/apache/commons/mail/LazyByteArrayDataSource.java:
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@@ -0,0 +1,108 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.apache.commons.mail;
+
+import javax.activation.DataSource;
+import javax.mail.util.ByteArrayDataSource;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+/**
+ * <p>Wrapper class for ByteArrayDataSource, which contain reference of MimePartDataSource for given attachment.
+ * Both type and name are duplicated stored in this class, in order to delay the load of attachment binary till getInputStream() is called.
+ * </p>
+ *
+ * @since 1.5
+ */
+public class LazyByteArrayDataSource implements DataSource {
+
+    /** InputStream reference for the email attachment binary. */
+    private final InputStream referenceInputStream;
+
+    /** ByteArrayDateSource instance which contain email attachment binary in the form of byte array. */
+    private ByteArrayDataSource ds;
+
+    /** Name of the attachment. */
+    private final String name;
+
+    /** Type of the attachment. */
+    private final String type;
+
+
+    /**
+     * Constructor for this class to read all necessary information for an email attachment.
+     *
+     * @param is the InputStream which represent the attachment binary.
+     * @param type the type of the attachment.
+     * @param name the name of the attachment.
+     */
+    public LazyByteArrayDataSource(InputStream is, String type, String name) {
+        this.referenceInputStream = is;
+        this.type = type;
+        this.name = name;
+    }
+
+    /**
+     * To return an {@code ByteArrayDataSource} instance which represent the email attachment.

Review Comment:
   how about `Gets an {@code ByteArrayDataSource} instance to represent the email attachment.`?



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