write binding code

CodeGen/BMapBindings/VariableType.java

@@ -0,0 +1,57 @@
+import java.util.Collections;
+
+public class VariableType {
+	/**
+	 * The base type of this variable which remove all ending stars.
+	 */
+	private String mBaseType;
+	/**
+	 * The pointer level of this type. It is equal with the count of stars.
+	 */
+	private int mPointerLevel;
+
+	public VariableType(String ctype) {
+		fromCType(ctype);
+	}
+	
+	private VariableType(String base_type, int pointer_level) {
+		mBaseType = base_type;
+		mPointerLevel = pointer_level;
+	}
+
+	public void fromCType(String ctype) {
+		if (ctype.isEmpty())
+			throw new IllegalArgumentException("empty string can not be parsed.");
+
+		int len = ctype.length();
+		int star_pos = ctype.indexOf('*');
+		if (star_pos == -1) {
+			// no star
+			mBaseType = ctype;
+			mPointerLevel = 0;
+		} else {
+			// has star
+			if (star_pos == 0)
+				throw new IllegalArgumentException("base type not found.");
+			mBaseType = ctype.substring(0, star_pos);
+			mPointerLevel = len - star_pos;
+		}
+	}
+
+	public String toCType() {
+		return mBaseType + String.join("", Collections.nCopies(mPointerLevel, "*"));
+	}
+
+	public String getBaseType() {
+		return mBaseType;
+	}
+
+	public boolean isPointer() {
+		return mPointerLevel != 0;
+	}
+
+	public VariableType getPointerOfThis() {
+		return new VariableType(mBaseType, mPointerLevel);
+	}
+	
+}