support fast parser option

Author: pjfanning

csv/src/main/java/com/fasterxml/jackson/dataformat/csv/impl/CsvDecoder.java

@@ -1228,7 +1228,7 @@ private final void _parseSlowFloatValue(boolean exactNumber)
                 _numTypesValid = NR_BIGDECIMAL;
             } else {
                 // Otherwise double has to do
-                _numberDouble = _textBuffer.contentsAsDouble();
+                _numberDouble = _textBuffer.contentsAsDouble(_owner.isEnabled(StreamReadFeature.USE_FAST_DOUBLE_PARSER));
                 _numTypesValid = NR_DOUBLE;
             }
         } catch (NumberFormatException nex) {

csv/src/main/java/com/fasterxml/jackson/dataformat/csv/impl/NumberInput.java

@@ -94,8 +94,24 @@ public final static boolean inLongRange(char[] digitChars, int offset, int len,
         return true;
     }
 
-    public final static double parseDouble(String numStr) throws NumberFormatException
-    {
-        return Double.parseDouble(numStr);
+    /**
+     * @param s a string representing a number to parse
+     * @return closest matching double
+     * @throws NumberFormatException if string cannot be represented by a double where useFastParser=false
+     * @see #parseDouble(String, boolean)
+     */
+    public static double parseDouble(final String s) throws NumberFormatException {
+        return parseDouble(s, false);
+    }
+
+    /**
+     * @param s a string representing a number to parse
+     * @param useFastParser whether to use {@link com.fasterxml.jackson.core.io.doubleparser}
+     * @return closest matching double
+     * @throws NumberFormatException if string cannot be represented by a double
+     * @since v2.14
+     */
+    public static double parseDouble(final String s, final boolean useFastParser) throws NumberFormatException {
+        return com.fasterxml.jackson.core.io.NumberInput.parseDouble(s, useFastParser);
     }
 }

csv/src/main/java/com/fasterxml/jackson/dataformat/csv/impl/TextBuffer.java

@@ -313,12 +313,24 @@ public BigDecimal contentsAsDecimal()
      * Convenience method for converting contents of the buffer
      * into a Double value.
      */
-    public double contentsAsDouble()
-        throws NumberFormatException
-    {
+    public double contentsAsDouble() throws NumberFormatException {
         return NumberInput.parseDouble(contentsAsString());
     }
 
+    /**
+     * Convenience method for converting contents of the buffer
+     * into a Double value.
+     *
+     * @param useFastParser whether to use {@link com.fasterxml.jackson.core.io.doubleparser}
+     * @return Buffered text value parsed as a {@link Double}, if possible
+     *
+     * @throws NumberFormatException if contents are not a valid Java number
+     * @since 2.14
+     */
+    public double contentsAsDouble(final boolean useFastParser) throws NumberFormatException {
+        return NumberInput.parseDouble(contentsAsString(), useFastParser);
+    }
+
     public boolean looksLikeInt() {
         final char[] ch = contentsAsArray();
         final int len = ch.length;

csv/src/test/java/com/fasterxml/jackson/dataformat/csv/FeaturesTest.java

@@ -1,5 +1,8 @@
 package com.fasterxml.jackson.dataformat.csv;
 
+import com.fasterxml.jackson.core.StreamReadFeature;
+import com.fasterxml.jackson.core.StreamWriteFeature;
+
 import java.io.StringWriter;
 
 public class FeaturesTest extends ModuleTestBase
@@ -26,4 +29,13 @@ public void testFactoryFeatures() throws Exception
         assertTrue(g.canUseSchema(CsvSchema.emptySchema()));
         g.close();
     }
+
+    public void testFactoryFastFeatures() throws Exception
+    {
+        CsvFactory f = new CsvFactory();
+        f.enable(StreamReadFeature.USE_FAST_DOUBLE_PARSER.mappedFeature());
+        assertTrue(f.isEnabled(StreamReadFeature.USE_FAST_DOUBLE_PARSER.mappedFeature()));
+        f.enable(StreamWriteFeature.USE_FAST_DOUBLE_WRITER.mappedFeature());
+        assertTrue(f.isEnabled(StreamWriteFeature.USE_FAST_DOUBLE_WRITER.mappedFeature()));
+    }
 }