单位换算Helper

businesscentral-core/src/main/java/cn/ibizlab/businesscentral/core/util/helper/UomHelper.java

+package cn.ibizlab.businesscentral.core.util.helper;
+
+import cn.ibizlab.businesscentral.core.odoo_uom.domain.Uom_category;
+import cn.ibizlab.businesscentral.core.odoo_uom.domain.Uom_uom;
+import cn.ibizlab.businesscentral.core.odoo_uom.filter.Uom_uomSearchContext;
+import cn.ibizlab.businesscentral.core.odoo_uom.service.IUom_uomService;
+import cn.ibizlab.businesscentral.util.dict.StaticDict;
+import org.apache.commons.lang3.StringUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@Component
+public class UomHelper {
+
+    @Autowired
+    IUom_uomService uom_uomService;
+
+    private Map<Long, Uom_uom> uom_cache = new HashMap<>();
+
+
+    /**
+     * 转换
+     *
+     * @param num
+     * @param from
+     * @param to
+     * @return
+     */
+    public double convert(double num, Uom_uom from, Uom_uom to) {
+        if (from.getCategoryId() != to.getCategoryId())
+            throw new RuntimeException("计量单位类别不同，无法进行转换。");
+        if (from.getId() == to.getId())
+            return num;
+        //先转换为参考计量单位
+        double _num = convert2reference(num, from);
+        //再转换成目标单位
+        return convert2other(_num, to);
+    }
+
+    /**
+     * 转换
+     * @param num
+     * @param from
+     * @param to
+     * @return
+     */
+    public double convert(double num, long from, long to) {
+        Uom_uom fromUom = this.getUom(from);
+        Uom_uom toUom = this.getUom(to);
+        return convert(num, fromUom, toUom);
+    }
+
+    /**
+     * 获取标准计量单位
+     *
+     * @param num
+     * @param uom
+     * @return
+     */
+    public double convert2reference(double num, Uom_uom uom) {
+        //参考计量单位
+        if (StringUtils.compare(uom.getUomType(), StaticDict.UOM_UOM__UOM_TYPE.REFERENCE.getValue()) == 0)
+            return num;
+
+        return num / uom.getFactor();
+    }
+
+
+    public double convert2other(double num, Uom_uom uom) {
+        //参考计量单位
+        if (StringUtils.compare(uom.getUomType(), StaticDict.UOM_UOM__UOM_TYPE.REFERENCE.getValue()) == 0)
+            return num;
+
+        return num / uom.getFactor();
+    }
+
+    private Uom_uom getUom(long id) {
+        if (this.uom_cache.containsKey(id)) {
+            return uom_cache.get(id);
+        }
+        Uom_uom uom = uom_uomService.get(id);
+        uom_cache.put(id, uom);
+        return uom;
+
+    }
+
+}