FieldParseInfo is now an abstract class, with a concrete subclass for each IsoType. This greatly improves the parsing speed.

git-svn-id: https://j8583.svn.sourceforge.net/svnroot/j8583/j8583@66 db60a039-f72e-0410-b1d2-baa000846441

src/main/java/com/solab/iso8583/parse/LllvarParseInfo.java

@@ -0,0 +1,67 @@
+package com.solab.iso8583.parse;
+
+import java.text.ParseException;
+
+import com.solab.iso8583.CustomField;
+import com.solab.iso8583.IsoType;
+import com.solab.iso8583.IsoValue;
+
+/** This class is used to parse fields of type LLLVAR.
+ * 
+ * @author Enrique Zamudio
+ */
+public class LllvarParseInfo extends FieldParseInfo {
+
+	
+	public LllvarParseInfo() {
+		super(IsoType.LLLVAR, 0);
+	}
+
+	public <T extends Object> IsoValue<?> parse(byte[] buf, int pos, CustomField<T> custom) throws ParseException {
+		if (pos < 0) {
+			throw new ParseException(String.format("Invalid position %d", pos), pos);
+		}
+		if (!(Character.isDigit(buf[pos]) && Character.isDigit(buf[pos+1]) && Character.isDigit(buf[pos+2]))) {
+			throw new ParseException(String.format("Invalid LLLVAR length '%s' pos %d",
+				new String(buf, pos, 3), pos), pos);
+		}
+		length = ((buf[pos] - 48) * 100) + ((buf[pos + 1] - 48) * 10) + (buf[pos + 2] - 48);
+		if (length < 0) {
+			throw new ParseException(String.format("Invalid LLLVAR length %d pos %d", length, pos), pos);
+		}
+		if (length+pos+3 > buf.length) {
+			throw new ParseException(String.format("Insufficient data for LLLVAR field, pos %d", pos), pos);
+		}
+		String _v = length == 0 ? "" : new String(buf, pos + 3, length);
+		if (custom == null) {
+			return new IsoValue<String>(type, _v, length, null);
+		} else {
+			IsoValue<T> v = new IsoValue<T>(type, custom.decodeField(_v), length, custom);
+			if (v.getValue() == null) {
+				//problems decoding? return the string
+				return new IsoValue<String>(type, _v, length, null);
+			}
+			return v;
+		}
+	}
+
+	public <T extends Object> IsoValue<?> parseBinary(byte[] buf, int pos, CustomField<T> custom) throws ParseException {
+		length = ((buf[pos] & 0x0f) * 100) + (((buf[pos + 1] & 0xf0) >> 4) * 10) + (buf[pos + 1] & 0x0f);
+		if (length < 0) {
+			throw new ParseException(String.format("Invalid LLLVAR length %d pos %d", length, pos), pos);
+		}
+		if (length+pos+2 > buf.length) {
+			throw new ParseException(String.format("Insufficient data for LLLVAR field, pos %d", pos), pos);
+		}
+		if (custom == null) {
+			return new IsoValue<String>(type, new String(buf, pos + 2, length), null);
+		} else {
+			IsoValue<T> v = new IsoValue<T>(type, custom.decodeField(new String(buf, pos + 2, length)), custom);
+			if (v.getValue() == null) {
+				return new IsoValue<String>(type, new String(buf, pos + 2, length), null);
+			}
+			return v;
+		}
+	}
+
+}