ADD file via upload

VPApprover.java

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+public class VPApprover extends BaseApprover {
+    private static final double MAX_APPROVAL_AMOUNT = 50000.0;
+    private static final double MIN_APPROVAL_AMOUNT = 10000.01; // 大于总监的审批上限
+    
+    public VPApprover(String approverName, Logger logger) {
+        super(approverName, ApprovalLevel.VP, logger);
+    }
+    
+    @Override
+    protected boolean canApprove(Order order) {
+        // VP只能审批金额在10000.01到50000之间的订单
+        return order.getAmount() > MIN_APPROVAL_AMOUNT && order.getAmount() <= MAX_APPROVAL_AMOUNT;
+    }
+    
+    @Override
+    protected boolean performApproval(Order order, ApprovalContext context) {
+        // VP审批逻辑：更严格的审批条件
+        OrderValidator validator = new OrderValidator();
+        boolean basicValid = validator.validateOrder(order);
+        
+        // 检查订单历史（如果有的话）
+        if (context.getApprovalHistory().size() > 0) {
+            // 确保所有前置审批都通过
+            boolean allPreviousApproved = context.getApprovalHistory().stream()
+                .allMatch(record -> record.approved);
+            if (!allPreviousApproved) {
+                getLogger().warn("存在未通过的前置审批，VP审批被拒绝");
+                return false;
+            }
+        }
+        
+        // 大额订单检查：超过25000的订单需要额外验证
+        if (order.getAmount() > 25000) {
+            getLogger().info("大额订单，执行额外验证");
+            // 假设这里会调用额外的验证服务
+        }
+        
+        return basicValid;
+    }
+}