Added properties to easy filter emails and attachments

e-invoice-domain/src/main/kotlin/net/codinux/invoicing/email/model/Email.kt

@@ -34,5 +34,12 @@ class Email(
 ) {
     val plainTextOrHtmlBody: String? by lazy { plainTextBody ?: htmlBody }
 
+    val hasAttachments: Boolean by lazy { attachments.isNotEmpty() }
+
+    val hasEInvoiceAttachment: Boolean by lazy { attachments.any { it.containsEInvoice } }
+
+    val hasPdfAttachment: Boolean by lazy { attachments.any { it.isPdfFile } }
+
+
     override fun toString() = "${date.atZone(ZoneId.systemDefault()).toLocalDate()} $sender: $subject, ${attachments.size} attachment(s)"
 }

e-invoice-domain/src/main/kotlin/net/codinux/invoicing/email/model/EmailAttachment.kt

@@ -18,5 +18,9 @@ class EmailAttachment(
     val invoice: Invoice? = null,
     val file: File? = null
 ) {
+    val containsEInvoice: Boolean by lazy { invoice != null }
+
+    val isPdfFile: Boolean by lazy { extension == "pdf" || mediaType == "application/pdf" }
+
     override fun toString() = "$filename: $invoice"
 }