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Java EntityMapper

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须知少年凌云志，曾许人间第一流。这篇文章主要讲述Java EntityMapper相关的知识，希望能为你提供帮助。

package org.rx.util; import org.rx.common.Func2; import org.rx.common.Action2; import org.rx.common.Func1; import org.rx.common.NQuery; import org.rx.security.MD5Util; import java.lang.reflect.Array; import java.lang.reflect.Method; import java.util.*; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.ConcurrentMap; /** * Created by wangxiaoming on 2016/3/11. */ public class EntityMapper { //region NestedTypes private static class MapEntity { public Func2< String, String, Boolean> MembersMatcher; public ObjectPostProcessor; public HashSet< String> IgnoreNames; }private static class DefaultMatcher implements Func2< String, String, Boolean> { @Override public Boolean invoke(String arg1, String arg2) { return arg1.equals(arg2); } } //endregion//region Fields private static final StringGET= "get", SET = "set"; private static final intgetDefaultWhenNull = 1 < < 0, putNewWhenNull = 1 < < 1; private static final MapEntityDefault; private static ConcurrentMap< String, MapEntity> Config; //endregion//region Methods static { Default = new MapEntity(); Default.IgnoreNames = new HashSet< > (); Default.IgnoreNames.add("getClass"); Default.MembersMatcher = new DefaultMatcher(); Config = new ConcurrentHashMap< > (); }private static MapEntity getConfig(Class< ?> tFrom, Class< ?> tTo, int flags) { String key = getKey(tFrom, tTo); MapEntity map = Config.get(key); if (map == null) { if ((flags & getDefaultWhenNull) == getDefaultWhenNull) { return Default; } if ((flags & putNewWhenNull) == putNewWhenNull) { Config.putIfAbsent(key, map = new MapEntity()); map.MembersMatcher = Default.MembersMatcher; } } return map; }private static String getKey(Class< ?> tFrom, Class< ?> tTo) { return MD5Util.md5Hex(tFrom.getName() + tTo.getName()); }public static < T> T createInstance(Class< T> type) { try { return type.newInstance(); } catch (ReflectiveOperationException ex) { throw new RuntimeException(ex); } } //endregion//region MapMethods public synchronized static < TF, TT> void setMembersMatcher(Class< TF> tFrom, Class< TT> tTo, Func2< String, String, Boolean> membersMatcher, Action2< TF, TT> postProcessor) { MapEntity map = getConfig(tFrom, tTo, putNewWhenNull); map.MembersMatcher = membersMatcher == null ? Default.MembersMatcher : membersMatcher; map.PostProcessor = postProcessor; }public synchronized static void setIgnoreMembers(Class< ?> tFrom, Class< ?> tTo, String... ignoreNames) { MapEntity map = getConfig(tFrom, tTo, putNewWhenNull); map.IgnoreNames = new HashSet< > (Arrays.asList(ignoreNames)); map.IgnoreNames.add("getClass"); }public static < TF, TT> TT[] map(Collection< TF> from, Class< TT> toType) { List< TT> toSet = new ArrayList< > (); for (Object o : from) { toSet.add(map(o, toType)); } TT[] x = (TT[]) Array.newInstance(toType, toSet.size()); toSet.toArray(x); return x; }public static < TF, TT> TT map(TF from, Class< TT> toType) { return map(from, createInstance(toType)); }public static < TF, TT> TT map(TF from, TT to) { return map(from, to, false); }public static < TF, TT> TT map(TF from, TT to, boolean skipNull) { Class< ?> tFrom = from.getClass(), tTo = to.getClass(); final MapEntity map = getConfig(tFrom, tTo, getDefaultWhenNull); NQuery< Method> fq = new NQuery< > (tFrom.getMethods()).where(new Func1< Method, Boolean> () { @Override public Boolean invoke(Method arg) { String fName = arg.getName(); return !map.IgnoreNames.contains(fName) & & fName.startsWith(GET); } }); NQuery< Method> tq = new NQuery< > (tTo.getMethods()).where(new Func1< Method, Boolean> () { @Override public Boolean invoke(Method arg) { return arg.getName().startsWith(SET); } }); for (Method fMethod : fq) { String fName = fMethod.getName(); final String tName = SET + fName.substring(3); //App.logInfo("EntityMapper Step1 %s", fName); Method tMethod = tq.where(new Func1< Method, Boolean> () { @Override public Boolean invoke(Method arg) { return map.MembersMatcher.invoke(tName, arg.getName()); } }).firstOrDefault(); Class< ?> [] tArgs; if (tMethod == null || (tArgs = tMethod.getParameterTypes()).length != 1) { //App.logInfo("EntityMapper %s Miss %s.%s", tTo.getSimpleName(), tFrom.getSimpleName(), tName); continue; } //App.logInfo("EntityMapper Step2 %s to %s", fName, tName); try { Object value = https://www.songbingjia.com/android/fMethod.invoke(from); if (value == null & & skipNull) { continue; } value = App.changeType(value, tArgs[0]); tMethod.invoke(to, value); } catch (ReflectiveOperationException ex) { throw new RuntimeException(ex); } }if (map.PostProcessor != null) { Action2< TF, TT> postProcessor = (Action2< TF, TT> ) map.PostProcessor; postProcessor.invoke(from, to); } return to; } //endregionpublic static void trim(Object entity) { Class< ?> type = entity.getClass(); NQuery< Method> fq = new NQuery< > (type.getMethods()).where(new Func1< Method, Boolean> () { @Override public Boolean invoke(Method arg) { return arg.getName().startsWith(GET) & & arg.getReturnType().equals(String.class); } }); for (Method method : fq) { try { String value = (String) method.invoke(entity); if (App.isNullOrEmpty(value)) { continue; } method = type.getMethod(SET + method.getName().substring(3), String.class); method.invoke(entity, value.trim()); } catch (ReflectiveOperationException ex) { throw new RuntimeException(ex); } } }public static Object getProperty(Object entity, String propName) { try { Method method = entity.getClass() .getMethod(GET + propName.substring(0, 1).toUpperCase() + propName.substring(1)); return method.invoke(entity); } catch (ReflectiveOperationException ex) { throw new RuntimeException(ex); } } }

【Java EntityMapper】 

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