DRY: Use `Charset` statics to eliminate exceptions

3 files changed, 13 insertions, 32 deletions

diff --git a/javanano/src/main/java/com/google/protobuf/nano/CodedInputByteBufferNano.java b/javanano/src/main/java/com/google/protobuf/nano/CodedInputByteBufferNano.java
index b4f20fde..4b45c6d2 100644
--- a/javanano/src/main/java/com/google/protobuf/nano/CodedInputByteBufferNano.java
+++ b/javanano/src/main/java/com/google/protobuf/nano/CodedInputByteBufferNano.java
@@ -190,12 +190,12 @@ public final class CodedInputByteBufferNano {
     if (size <= (bufferSize - bufferPos) && size > 0) {
       // Fast path:  We already have the bytes in a contiguous buffer, so
       //   just copy directly from it.
-      final String result = new String(buffer, bufferPos, size, "UTF-8");
+      final String result = new String(buffer, bufferPos, size, InternalNano.UTF_8);
       bufferPos += size;
       return result;
     } else {
       // Slow path:  Build a byte array first then copy it.
-      return new String(readRawBytes(size), "UTF-8");
+      return new String(readRawBytes(size), InternalNano.UTF_8);
     }
   }
 
diff --git a/javanano/src/main/java/com/google/protobuf/nano/CodedOutputByteBufferNano.java b/javanano/src/main/java/com/google/protobuf/nano/CodedOutputByteBufferNano.java
index 2777f34c..1f0534b1 100644
--- a/javanano/src/main/java/com/google/protobuf/nano/CodedOutputByteBufferNano.java
+++ b/javanano/src/main/java/com/google/protobuf/nano/CodedOutputByteBufferNano.java
@@ -291,7 +291,7 @@ public final class CodedOutputByteBufferNano {
     // Unfortunately there does not appear to be any way to tell Java to encode
     // UTF-8 directly into our buffer, so we have to let it create its own byte
     // array and then copy.
-    final byte[] bytes = value.getBytes("UTF-8");
+    final byte[] bytes = value.getBytes(InternalNano.UTF_8);
     writeRawVarint32(bytes.length);
     writeRawBytes(bytes);
   }
@@ -603,13 +603,9 @@ public final class CodedOutputByteBufferNano {
    * {@code string} field.
    */
   public static int computeStringSizeNoTag(final String value) {
-    try {
-      final byte[] bytes = value.getBytes("UTF-8");
-      return computeRawVarint32Size(bytes.length) +
-             bytes.length;
-    } catch (UnsupportedEncodingException e) {
-      throw new RuntimeException("UTF-8 not supported.");
-    }
+    final byte[] bytes = value.getBytes(InternalNano.UTF_8);
+    return computeRawVarint32Size(bytes.length) +
+           bytes.length;
   }
 
   /**
diff --git a/javanano/src/main/java/com/google/protobuf/nano/InternalNano.java b/javanano/src/main/java/com/google/protobuf/nano/InternalNano.java
index 4a08bb58..67404d27 100644
--- a/javanano/src/main/java/com/google/protobuf/nano/InternalNano.java
+++ b/javanano/src/main/java/com/google/protobuf/nano/InternalNano.java
@@ -34,9 +34,10 @@ import com.google.protobuf.nano.MapFactories.MapFactory;
 
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
+import java.nio.charset.Charset;
 import java.util.Arrays;
-import java.util.Map;
 import java.util.Map.Entry;
+import java.util.Map;
 
 /**
  * The classes contained within are used internally by the Protocol Buffer
@@ -67,6 +68,8 @@ public final class InternalNano {
   public static final int TYPE_SINT32   = 17;
   public static final int TYPE_SINT64   = 18;
 
+  protected static final Charset UTF_8 = Charset.forName("UTF-8");
+  protected static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
 
   private InternalNano() {}
 
@@ -111,14 +114,7 @@ public final class InternalNano {
    * generated code calls this automatically.
    */
   public static String stringDefaultValue(String bytes) {
-    try {
-      return new String(bytes.getBytes("ISO-8859-1"), "UTF-8");
-    } catch (UnsupportedEncodingException e) {
-      // This should never happen since all JVMs are required to implement
-      // both of the above character sets.
-      throw new IllegalStateException(
-          "Java VM does not support a standard character set.", e);
-    }
+    return new String(bytes.getBytes(ISO_8859_1), InternalNano.UTF_8);
   }
 
   /**
@@ -130,14 +126,7 @@ public final class InternalNano {
    * embed raw bytes as a string literal with ISO-8859-1 encoding.
    */
   public static byte[] bytesDefaultValue(String bytes) {
-    try {
-      return bytes.getBytes("ISO-8859-1");
-    } catch (UnsupportedEncodingException e) {
-      // This should never happen since all JVMs are required to implement
-      // ISO-8859-1.
-      throw new IllegalStateException(
-          "Java VM does not support a standard character set.", e);
-    }
+    return bytes.getBytes(ISO_8859_1);
   }
 
   /**
@@ -145,11 +134,7 @@ public final class InternalNano {
    * UnsupportedEncodingException to a RuntimeException.
    */
   public static byte[] copyFromUtf8(final String text) {
-    try {
-      return text.getBytes("UTF-8");
-    } catch (UnsupportedEncodingException e) {
-      throw new RuntimeException("UTF-8 not supported?");
-    }
+    return text.getBytes(InternalNano.UTF_8);
   }
 
   /**