polish

org.springframework.context/src/main/java/org/springframework/ui/binding/support/ValueBuffer.java

@@ -0,0 +1,63 @@
+/**
+ * 
+ */
+package org.springframework.ui.binding.support;
+
+import org.springframework.ui.binding.Binding.Model;
+
+class ValueBuffer {
+
+	private Object value;
+	
+	private boolean hasValue;
+	
+	private Model model;
+	
+	private boolean flushFailed;
+	
+	private Exception flushException;
+	
+	public ValueBuffer(Model model) {
+		this.model = model;
+	}
+	
+	public boolean hasValue() {
+		return hasValue;
+	}
+	
+	public Object getValue() {
+		if (!hasValue()) {
+			throw new IllegalStateException("No value in buffer");
+		}
+		return value;
+	}
+	
+	public void setValue(Object value) {
+		this.value = value;
+		hasValue = true;
+	}
+	
+	public void flush() {
+		try {
+			model.setValue(value);
+			clear();
+		} catch (Exception e) {
+			flushFailed = true;
+			flushException = e;
+		}
+	}
+
+	public void clear() {
+		value = null;
+		hasValue = false;
+		flushFailed = false;
+	}
+	
+	public boolean flushFailed() {
+		return flushFailed;
+	}
+	
+	public Exception getFlushException() {
+		return flushException;
+	}
+}