refactor ops

bitcoin-script/src/main/java/com/itranswarp/bitcoin/script/DataOp.java

@@ -0,0 +1,25 @@
+package com.itranswarp.bitcoin.script;
+
+import com.itranswarp.bitcoin.util.HashUtils;
+
+/**
+ * Data op is executed by script engine directly.
+ * 
+ * @author liaoxuefeng
+ */
+public class DataOp extends Op {
+
+	final byte[] data;
+
+	DataOp(int code, byte[] data) {
+		super(code, "DATA(" + HashUtils.toHexString(data) + ")");
+		this.data = data;
+	}
+
+	@Override
+	public boolean execute(ScriptContext context) {
+		log.info("push data: " + HashUtils.toHexString(data));
+		context.push(data);
+		return true;
+	}
+}

bitcoin-script/src/main/java/com/itranswarp/bitcoin/script/Op.java

@@ -5,8 +5,12 @@
 
 public abstract class Op {
 
+	public static final byte[] TRUE = new byte[] { 1 };
+	public static final byte[] FALSE = new byte[] { 0 };
+
 	protected final Log log = LogFactory.getLog(getClass());
 
+	public final int code;
 	public final String name;
 
 	/**
@@ -15,7 +19,8 @@ public abstract class Op {
 	 * @param name
 	 *            Human-readable name.
 	 */
-	public Op(String name) {
+	public Op(int code, String name) {
+		this.code = code;
 		this.name = name;
 	}