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!765 简化LambdaInfo初始化方法，调整实例化方法参数类型名称

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Merge pull request !765 from Createsequence/v6-lambda
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Looly 2022-08-23 07:26:19 +00:00 committed by Gitee
commit bb19e7d263
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2 changed files with 48 additions and 45 deletions
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91
hutool-core/src/main/java/cn/hutool/core/lang/func/LambdaInfo.java
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@ -1,6 +1,7 @@
package cn.hutool.core.lang.func; package cn.hutool.core.lang.func;
import cn.hutool.core.classloader.ClassLoaderUtil; import cn.hutool.core.classloader.ClassLoaderUtil;
import cn.hutool.core.lang.Assert;
import cn.hutool.core.text.StrPool; import cn.hutool.core.text.StrPool;
import java.lang.invoke.SerializedLambda; import java.lang.invoke.SerializedLambda;
@ -16,7 +17,8 @@ import java.lang.reflect.Type;
*/ */
public class LambdaInfo { public class LambdaInfo {
private final Type[] instantiatedTypes; private static final Type[] EMPTY_TYPE = new Type[0];
private final Type[] instantiatedMethodParameterTypes;
private final Type[] parameterTypes; private final Type[] parameterTypes;
private final Type returnType; private final Type returnType;
private final String name; private final String name;
@ -25,53 +27,54 @@ public class LambdaInfo {
private final SerializedLambda lambda; private final SerializedLambda lambda;
public LambdaInfo(final Executable executable, final SerializedLambda lambda) { public LambdaInfo(final Executable executable, final SerializedLambda lambda) {
if (executable instanceof Method) { // return type
final Method method = (Method) executable; final boolean isMethod = executable instanceof Method;
this.parameterTypes = method.getGenericParameterTypes(); final boolean isConstructor = executable instanceof Constructor;
this.returnType = method.getGenericReturnType(); Assert.isTrue(isMethod || isConstructor, "Unsupported executable type: " + executable.getClass());
this.name = method.getName(); this.returnType = isMethod ?
this.clazz = method.getDeclaringClass(); ((Method)executable).getGenericReturnType() : ((Constructor<?>)executable).getDeclaringClass();
} else if (executable instanceof Constructor) {
final Constructor<?> constructor = (Constructor<?>) executable; // lambda info
this.parameterTypes = constructor.getGenericParameterTypes(); this.parameterTypes = executable.getGenericParameterTypes();
this.returnType = constructor.getDeclaringClass(); this.name = executable.getName();
this.name = constructor.getName(); this.clazz = executable.getDeclaringClass();
this.clazz = constructor.getDeclaringClass();
} else {
throw new IllegalArgumentException("Unsupported executable type: " + executable.getClass());
}
final int index = lambda.getInstantiatedMethodType().indexOf(";)");
if (index > -1) {
final String className = lambda.getInstantiatedMethodType().substring(1, index + 1);
final String[] instantiatedTypeNames = className.split(";");
final Type[] types = new Type[instantiatedTypeNames.length];
for (int i = 0; i < instantiatedTypeNames.length; i++) {
final boolean isArray = instantiatedTypeNames[i].startsWith(StrPool.BRACKET_START);
if (isArray && !instantiatedTypeNames[i].endsWith(";")) {
// 如果是数组，需要以 ";" 结尾才能加载
instantiatedTypeNames[i] += ";";
} else {
if (instantiatedTypeNames[i].startsWith("L")) {
// 如果以 "L" 开头，删除 L
instantiatedTypeNames[i] = instantiatedTypeNames[i].substring(1);
}
if (instantiatedTypeNames[i].endsWith(";")) {
// 如果以 ";" 结尾，删除 ";"
instantiatedTypeNames[i] = instantiatedTypeNames[i].substring(0, instantiatedTypeNames[i].length() - 1);
}
}
types[i] = ClassLoaderUtil.loadClass(instantiatedTypeNames[i]);
}
this.instantiatedTypes = types;
} else {
this.instantiatedTypes = new Type[0];
}
this.executable = executable; this.executable = executable;
this.lambda = lambda; this.lambda = lambda;
// types
final int index = lambda.getInstantiatedMethodType().indexOf(";)");
this.instantiatedMethodParameterTypes = (index > -1) ? getInstantiatedMethodParamTypes(lambda, index) : EMPTY_TYPE;
} }
public Type[] getInstantiatedTypes() { /**
return instantiatedTypes; * 根据lambda对象的方法签名信息，解析获得实际的参数类型
*/
private Type[] getInstantiatedMethodParamTypes(SerializedLambda lambda, int index) {
final String className = lambda.getInstantiatedMethodType().substring(1, index + 1);
final String[] instantiatedTypeNames = className.split(";");
final Type[] types = new Type[instantiatedTypeNames.length];
for (int i = 0; i < instantiatedTypeNames.length; i++) {
final boolean isArray = instantiatedTypeNames[i].startsWith(StrPool.BRACKET_START);
if (isArray && !instantiatedTypeNames[i].endsWith(";")) {
// 如果是数组，需要以 ";" 结尾才能加载
instantiatedTypeNames[i] += ";";
} else {
if (instantiatedTypeNames[i].startsWith("L")) {
// 如果以 "L" 开头，删除 L
instantiatedTypeNames[i] = instantiatedTypeNames[i].substring(1);
}
if (instantiatedTypeNames[i].endsWith(";")) {
// 如果以 ";" 结尾，删除 ";"
instantiatedTypeNames[i] = instantiatedTypeNames[i].substring(0, instantiatedTypeNames[i].length() - 1);
}
}
types[i] = ClassLoaderUtil.loadClass(instantiatedTypeNames[i]);
}
return types;
}
public Type[] getInstantiatedMethodParameterTypes() {
return instantiatedMethodParameterTypes;
} }
public Type[] getParameterTypes() { public Type[] getParameterTypes() {

2
hutool-core/src/main/java/cn/hutool/core/lang/func/LambdaUtil.java
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@ -61,7 +61,7 @@ public class LambdaUtil {
@SuppressWarnings("unchecked") @SuppressWarnings("unchecked")
public static <R, T extends Serializable> Class<R> getRealClass(final T func) { public static <R, T extends Serializable> Class<R> getRealClass(final T func) {
final LambdaInfo lambdaInfo = resolve(func); final LambdaInfo lambdaInfo = resolve(func);
return (Class<R>) Opt.of(lambdaInfo).map(LambdaInfo::getInstantiatedTypes).filter(types -> types.length != 0).map(types -> types[types.length - 1]).orElseGet(lambdaInfo::getClazz); return (Class<R>) Opt.of(lambdaInfo).map(LambdaInfo::getInstantiatedMethodParameterTypes).filter(types -> types.length != 0).map(types -> types[types.length - 1]).orElseGet(lambdaInfo::getClazz);
} }
/** /**