Provide semantically meaningful exceptions for translation

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

app/src/main/java/com/wireguard/config/ParseException.java

@@ -5,34 +5,37 @@
 
 package com.wireguard.config;
 
+import android.support.annotation.Nullable;
+
 /**
- * An exception representing a failure to parse an element of a WireGuard configuration. The context
- * for this failure can be retrieved with {@link #getContext}, and the text that failed to parse can
- * be retrieved with {@link #getText}.
  */
 public class ParseException extends Exception {
-    private final String context;
+    private final Class<?> parsingClass;
     private final CharSequence text;
 
-    public ParseException(final String context, final CharSequence text, final String message) {
-        super(message);
-        this.context = context;
+    public ParseException(final Class<?> parsingClass, final CharSequence text,
+                          @Nullable final String message, @Nullable final Throwable cause) {
+        super(message, cause);
+        this.parsingClass = parsingClass;
         this.text = text;
     }
 
-    public ParseException(final String context, final CharSequence text, final Throwable cause) {
-        super(cause.getMessage(), cause);
-        this.context = context;
-        this.text = text;
+    public ParseException(final Class<?> parsingClass, final CharSequence text,
+                          @Nullable final String message) {
+        this(parsingClass, text, message, null);
     }
 
-    public ParseException(final String context, final CharSequence text) {
-        this.context = context;
-        this.text = text;
+    public ParseException(final Class<?> parsingClass, final CharSequence text,
+                          @Nullable final Throwable cause) {
+        this(parsingClass, text, null, cause);
     }
 
-    public String getContext() {
-        return context;
+    public ParseException(final Class<?> parsingClass, final CharSequence text) {
+        this(parsingClass, text, null, null);
+    }
+
+    public Class<?> getParsingClass() {
+        return parsingClass;
     }
 
     public CharSequence getText() {