add enhance BeanUtils - BeanUtilEx

src/main/java/com/github/ahunigel/util/BeanUtilEx.java

@@ -0,0 +1,106 @@
+package com.github.ahunigel.util;
+
+import com.google.common.collect.Lists;
+import org.springframework.beans.*;
+import org.springframework.util.ReflectionUtils;
+
+import java.beans.PropertyDescriptor;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.Collection;
+import java.util.List;
+import java.util.Objects;
+import java.util.function.Predicate;
+
+import static java.util.Objects.nonNull;
+
+/**
+ * Enhance the spring {@link BeanUtils}, provide some filters for copy properties
+ * <p>Created by nigel on 2020/1/17.
+ *
+ * @author nigel
+ */
+public class BeanUtilEx extends BeanUtils {
+
+  private BeanUtilEx() {
+  }
+
+  /**
+   * provide name/value filter to find out which properties should be copied.
+   *
+   * @param source
+   * @param target
+   * @param nameFilter
+   * @param valueFilter
+   */
+  public static void copyProperties(Object source, Object target, Predicate nameFilter, Predicate valueFilter) {
+    List<String> ignoreProperties = Lists.newArrayList();
+    PropertyDescriptor[] sourcePds = getPropertyDescriptors(source.getClass());
+    for (PropertyDescriptor sourcePd : sourcePds) {
+      if (sourcePd != null) {
+        Method readMethod = sourcePd.getReadMethod();
+        if (readMethod != null) {
+          if (!Modifier.isPublic(readMethod.getDeclaringClass().getModifiers())) {
+            readMethod.setAccessible(true);
+          }
+          try {
+            Object value = readMethod.invoke(source);
+            if (nonNull(nameFilter) && !nameFilter.test(sourcePd.getName())) {
+              ignoreProperties.add(sourcePd.getName());
+            }
+            if (nonNull(valueFilter) && !valueFilter.test(value)) {
+              ignoreProperties.add(sourcePd.getName());
+            }
+          } catch (IllegalAccessException | InvocationTargetException e) {
+            throw new FatalBeanException("Could not read property '" + sourcePd.getName() + "' from source", e);
+          }
+        }
+      }
+    }
+    BeanUtils.copyProperties(source, target, ignoreProperties.toArray(new String[0]));
+  }
+
+  public static <T> T copyNonNullPropertiesForSameClass(T source, T target) {
+    if (source == null || target == null || target.getClass() != source.getClass()) {
+      return null;
+    }
+
+    final BeanWrapper src = new BeanWrapperImpl(source);
+    final BeanWrapper trg = new BeanWrapperImpl(target);
+    ReflectionUtils.doWithFields(target.getClass(), field -> {
+          Object providedObject = src.getPropertyValue(field.getName());
+          if (providedObject != null && !(providedObject instanceof Collection<?>)) {
+            trg.setPropertyValue(
+                field.getName(),
+                providedObject);
+          }
+        }
+        , field -> !Modifier.isStatic(field.getModifiers()));
+    return target;
+  }
+
+  /**
+   * Copy non-null property values of the given source bean into the target bean.
+   * <p>Note: The source and target classes do not have to match or even be derived
+   * from each other, as long as the properties match. Any bean properties that the
+   * source bean exposes but the target bean does not will silently be ignored.
+   * <p>This is just a convenience method. For more complex transfer needs,
+   * consider using a full BeanWrapper.
+   * <p>
+   * null property values from given source would be add to ignore properties list
+   *
+   * @param source the source bean
+   * @param target the target bean
+   * @throws BeansException if the copying failed
+   * @see BeanWrapper
+   */
+  public static void copyNonNullProperties(Object source, Object target) {
+    copyProperties(source, target, null, Objects::nonNull);
+  }
+
+  public static void copyProperties(Object source, Object target, Predicate valueIgnoreFilter) {
+    copyProperties(source, target, null, valueIgnoreFilter.negate());
+  }
+
+}