Java examples for Reflection:Java Bean
copy Property of Java Bean
import java.beans.BeanInfo; import java.beans.IndexedPropertyDescriptor; import java.beans.IntrospectionException; import java.beans.Introspector; import java.beans.PropertyDescriptor; import java.lang.reflect.Array; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; public class Main{ private static final String INDEXED_DELIM = "["; private static final String INDEXED_DELIM2 = "]"; private static final String MAPPED_DELIM = "("; private static final String MAPPED_DELIM2 = ")"; private static final String NESTED_DELIM = "."; public static void copyProperty(Object fromBean, String name, Object toBean) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { Object value = getNestedProperty(fromBean, name); setNestedProperty(toBean, name, value); }/*from w w w . java 2 s. co m*/ public static Object getNestedProperty(Object bean, String name) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { String[] properties = name.split("\\" + NESTED_DELIM); for (int i = 0; i < properties.length; i++) { if (properties[i].contains(INDEXED_DELIM)) { bean = getIndexedProperty(bean, properties[i]); continue; } if (properties[i].contains(MAPPED_DELIM)) { bean = getMappedProperty(bean, properties[i]); continue; } bean = getSimpleProperty(bean, properties[i]); } return bean; } public static void setNestedProperty(Object bean, String name, Object value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { String[] properties = name.split("\\" + NESTED_DELIM); for (int i = 0; i < properties.length - 1; i++) { if (properties[i].contains(INDEXED_DELIM)) { bean = getIndexedProperty(bean, properties[i]); continue; } if (properties[i].contains(MAPPED_DELIM)) { bean = getMappedProperty(bean, properties[i]); continue; } bean = getSimpleProperty(bean, properties[i]); } if (properties[properties.length - 1].contains(INDEXED_DELIM)) { setIndexedProperty(bean, properties[properties.length - 1], value); } if (properties[properties.length - 1].contains(MAPPED_DELIM)) { setMappedProperty(bean, properties[properties.length - 1], value); } setSimpleProperty(bean, properties[properties.length - 1], value); } public static Object getIndexedProperty(Object bean, String name) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { int delim = name.indexOf(INDEXED_DELIM); int delim2 = name.indexOf(INDEXED_DELIM2); if ((delim < 0) || (delim2 <= delim)) throw new IllegalArgumentException("Invalid indexed property '" + name + "'"); int index = -1; try { String subscript = name.substring(delim + 1, delim2); index = Integer.parseInt(subscript); } catch (NumberFormatException e) { throw new IllegalArgumentException("Invalid indexed property '" + name + "'"); } name = name.substring(0, delim); return getIndexedProperty(bean, name, index); } public static Object getIndexedProperty(Object bean, String name, int index) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { PropertyDescriptor propertyDescriptor = getPropertyDescriptor(bean, name); if (propertyDescriptor == null) throw new IllegalArgumentException("No property:" + name); if (propertyDescriptor instanceof IndexedPropertyDescriptor) { Method readMethod = ((IndexedPropertyDescriptor) propertyDescriptor) .getIndexedReadMethod(); if (readMethod == null) throw new IllegalArgumentException( "No readMethod for property:" + name); Object value = readMethod.invoke(bean, new Object[] { new Integer(index) }); return value; } Method readMethod = propertyDescriptor.getReadMethod(); if (readMethod == null) throw new IllegalArgumentException( "No readMethod for property:" + name); Object array = readMethod.invoke(bean, new Object[0]); if (array.getClass().isArray()) { return Array.get(array, index); } if (!(array instanceof java.util.List)) throw new IllegalArgumentException("Property '" + name + "' is not indexed"); return ((java.util.List<?>) array).get(index); } public static Object getMappedProperty(Object bean, String name) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { int delim = name.indexOf(MAPPED_DELIM); int delim2 = name.indexOf(MAPPED_DELIM2); if ((delim < 0) || (delim2 <= delim)) throw new IllegalArgumentException("Invalid mapped property '" + name + "'"); String subscript = name.substring(delim + 1, delim2); name = name.substring(0, delim); return getMappedProperty(bean, name, subscript); } public static Object getMappedProperty(Object bean, String name, String key) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { PropertyDescriptor propertyDescriptor = getPropertyDescriptor(bean, name); if (propertyDescriptor == null) throw new IllegalArgumentException("No property:" + name); Method readMethod = propertyDescriptor.getReadMethod(); if (readMethod == null) throw new IllegalArgumentException( "No readMethod for property:" + name); Object map = readMethod.invoke(bean, new Object[0]); if (!(map instanceof java.util.Map)) throw new IllegalArgumentException("Property '" + name + "' is not mapped"); return ((java.util.Map<?, ?>) map).get(key); } public static Object getSimpleProperty(Object bean, String name) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { Method readMethod = getSimplePropertyReadMethod(bean, name); if (readMethod == null) throw new IllegalArgumentException( "No readMethod for property:" + name); readMethod.setAccessible(true); Object value = readMethod.invoke(bean, new Object[0]); return value; } public static void setIndexedProperty(Object bean, String name, Object value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { int delim = name.indexOf(INDEXED_DELIM); int delim2 = name.indexOf(INDEXED_DELIM2); if ((delim < 0) || (delim2 <= delim)) throw new IllegalArgumentException("Invalid indexed property '" + name + "'"); int index = -1; try { String subscript = name.substring(delim + 1, delim2); index = Integer.parseInt(subscript); } catch (NumberFormatException e) { throw new IllegalArgumentException("Invalid indexed property '" + name + "'"); } name = name.substring(0, delim); setIndexedProperty(bean, name, index, value); } @SuppressWarnings({ "unchecked", "rawtypes" }) public static void setIndexedProperty(Object bean, String name, int index, Object value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { PropertyDescriptor propertyDescriptor = getPropertyDescriptor(bean, name); if (propertyDescriptor == null) throw new IllegalArgumentException("No property:" + name); if (propertyDescriptor instanceof IndexedPropertyDescriptor) { Method writeMethod = ((IndexedPropertyDescriptor) propertyDescriptor) .getIndexedWriteMethod(); if (writeMethod == null) throw new IllegalArgumentException( "No writeMethod for property:" + name); writeMethod.invoke(bean, new Object[] { new Integer(index), value }); return; } Method readMethod = propertyDescriptor.getReadMethod(); if (readMethod == null) throw new IllegalArgumentException( "No readMethod for property:" + name); Object array = readMethod.invoke(bean, new Object[0]); if (array.getClass().isArray()) { Array.set(array, index, value); return; } if (!(array instanceof java.util.List)) throw new IllegalArgumentException("Property '" + name + "' is not indexed"); ((java.util.List) array).set(index, value); } public static void setMappedProperty(Object bean, String name, Object value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { int delim = name.indexOf(MAPPED_DELIM); int delim2 = name.indexOf(MAPPED_DELIM2); if ((delim < 0) || (delim2 <= delim)) throw new IllegalArgumentException("Invalid mapped property '" + name + "'"); String subscript = name.substring(delim + 1, delim2); name = name.substring(0, delim); setMappedProperty(bean, name, subscript, value); } @SuppressWarnings({ "rawtypes", "unchecked" }) public static void setMappedProperty(Object bean, String name, String key, Object value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { PropertyDescriptor propertyDescriptor = getPropertyDescriptor(bean, name); if (propertyDescriptor == null) throw new IllegalArgumentException("No property:" + name); Method readMethod = propertyDescriptor.getReadMethod(); if (readMethod == null) throw new IllegalArgumentException( "No readMethod for property:" + name); Object map = readMethod.invoke(bean, new Object[0]); if (!(map instanceof java.util.Map)) throw new IllegalArgumentException("Property '" + name + "' is not mapped"); ((java.util.Map) map).put(key, value); } public static void setSimpleProperty(Object bean, String name, Object value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { Method writeMethod = getSimplePropertyWriteMethod(bean, name); if (writeMethod == null) throw new IllegalArgumentException( "No writeMethod for property:" + name); writeMethod.setAccessible(true); writeMethod.invoke(bean, value); } public static PropertyDescriptor getPropertyDescriptor(Object bean, String name) { PropertyDescriptor[] descriptors = getPropertyDescriptors(bean); for (int i = 0; i < descriptors.length; i++) { if (name.equals(descriptors[i].getName())) return descriptors[i]; } return null; } public static Method getSimplePropertyReadMethod(Object bean, String name) { PropertyDescriptor propertyDescriptor = getPropertyDescriptor(bean, name); if (propertyDescriptor == null) throw new IllegalArgumentException("No property:" + name); return propertyDescriptor.getReadMethod(); } public static Method getSimplePropertyWriteMethod(Object bean, String name) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { PropertyDescriptor propertyDescriptor = getPropertyDescriptor(bean, name); if (propertyDescriptor == null) throw new IllegalArgumentException("No property:" + name); return propertyDescriptor.getWriteMethod(); } }