1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/rt/emul/compact/src/main/java/java/lang/invoke/SerializedLambda.java Sun Sep 14 19:27:44 2014 +0200
1.3 @@ -0,0 +1,257 @@
1.4 +/*
1.5 + * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +package java.lang.invoke;
1.29 +
1.30 +import java.io.Serializable;
1.31 +import java.lang.reflect.Method;
1.32 +import java.security.AccessController;
1.33 +import java.security.PrivilegedActionException;
1.34 +import java.security.PrivilegedExceptionAction;
1.35 +import java.util.Objects;
1.36 +
1.37 +/**
1.38 + * Serialized form of a lambda expression. The properties of this class
1.39 + * represent the information that is present at the lambda factory site, including
1.40 + * static metafactory arguments such as the identity of the primary functional
1.41 + * interface method and the identity of the implementation method, as well as
1.42 + * dynamic metafactory arguments such as values captured from the lexical scope
1.43 + * at the time of lambda capture.
1.44 + *
1.45 + * <p>Implementors of serializable lambdas, such as compilers or language
1.46 + * runtime libraries, are expected to ensure that instances deserialize properly.
1.47 + * One means to do so is to ensure that the {@code writeReplace} method returns
1.48 + * an instance of {@code SerializedLambda}, rather than allowing default
1.49 + * serialization to proceed.
1.50 + *
1.51 + * <p>{@code SerializedLambda} has a {@code readResolve} method that looks for
1.52 + * a (possibly private) static method called
1.53 + * {@code $deserializeLambda$(SerializedLambda)} in the capturing class, invokes
1.54 + * that with itself as the first argument, and returns the result. Lambda classes
1.55 + * implementing {@code $deserializeLambda$} are responsible for validating
1.56 + * that the properties of the {@code SerializedLambda} are consistent with a
1.57 + * lambda actually captured by that class.
1.58 + *
1.59 + * @see LambdaMetafactory
1.60 + */
1.61 +public final class SerializedLambda implements Serializable {
1.62 + private static final long serialVersionUID = 8025925345765570181L;
1.63 + private final Class<?> capturingClass;
1.64 + private final String functionalInterfaceClass;
1.65 + private final String functionalInterfaceMethodName;
1.66 + private final String functionalInterfaceMethodSignature;
1.67 + private final String implClass;
1.68 + private final String implMethodName;
1.69 + private final String implMethodSignature;
1.70 + private final int implMethodKind;
1.71 + private final String instantiatedMethodType;
1.72 + private final Object[] capturedArgs;
1.73 +
1.74 + /**
1.75 + * Create a {@code SerializedLambda} from the low-level information present
1.76 + * at the lambda factory site.
1.77 + *
1.78 + * @param capturingClass The class in which the lambda expression appears
1.79 + * @param functionalInterfaceClass Name, in slash-delimited form, of static
1.80 + * type of the returned lambda object
1.81 + * @param functionalInterfaceMethodName Name of the functional interface
1.82 + * method for the present at the
1.83 + * lambda factory site
1.84 + * @param functionalInterfaceMethodSignature Signature of the functional
1.85 + * interface method present at
1.86 + * the lambda factory site
1.87 + * @param implMethodKind Method handle kind for the implementation method
1.88 + * @param implClass Name, in slash-delimited form, for the class holding
1.89 + * the implementation method
1.90 + * @param implMethodName Name of the implementation method
1.91 + * @param implMethodSignature Signature of the implementation method
1.92 + * @param instantiatedMethodType The signature of the primary functional
1.93 + * interface method after type variables
1.94 + * are substituted with their instantiation
1.95 + * from the capture site
1.96 + * @param capturedArgs The dynamic arguments to the lambda factory site,
1.97 + * which represent variables captured by
1.98 + * the lambda
1.99 + */
1.100 + public SerializedLambda(Class<?> capturingClass,
1.101 + String functionalInterfaceClass,
1.102 + String functionalInterfaceMethodName,
1.103 + String functionalInterfaceMethodSignature,
1.104 + int implMethodKind,
1.105 + String implClass,
1.106 + String implMethodName,
1.107 + String implMethodSignature,
1.108 + String instantiatedMethodType,
1.109 + Object[] capturedArgs) {
1.110 + this.capturingClass = capturingClass;
1.111 + this.functionalInterfaceClass = functionalInterfaceClass;
1.112 + this.functionalInterfaceMethodName = functionalInterfaceMethodName;
1.113 + this.functionalInterfaceMethodSignature = functionalInterfaceMethodSignature;
1.114 + this.implMethodKind = implMethodKind;
1.115 + this.implClass = implClass;
1.116 + this.implMethodName = implMethodName;
1.117 + this.implMethodSignature = implMethodSignature;
1.118 + this.instantiatedMethodType = instantiatedMethodType;
1.119 + this.capturedArgs = Objects.requireNonNull(capturedArgs).clone();
1.120 + }
1.121 +
1.122 + /**
1.123 + * Get the name of the class that captured this lambda.
1.124 + * @return the name of the class that captured this lambda
1.125 + */
1.126 + public String getCapturingClass() {
1.127 + return capturingClass.getName().replace('.', '/');
1.128 + }
1.129 +
1.130 + /**
1.131 + * Get the name of the invoked type to which this
1.132 + * lambda has been converted
1.133 + * @return the name of the functional interface class to which
1.134 + * this lambda has been converted
1.135 + */
1.136 + public String getFunctionalInterfaceClass() {
1.137 + return functionalInterfaceClass;
1.138 + }
1.139 +
1.140 + /**
1.141 + * Get the name of the primary method for the functional interface
1.142 + * to which this lambda has been converted.
1.143 + * @return the name of the primary methods of the functional interface
1.144 + */
1.145 + public String getFunctionalInterfaceMethodName() {
1.146 + return functionalInterfaceMethodName;
1.147 + }
1.148 +
1.149 + /**
1.150 + * Get the signature of the primary method for the functional
1.151 + * interface to which this lambda has been converted.
1.152 + * @return the signature of the primary method of the functional
1.153 + * interface
1.154 + */
1.155 + public String getFunctionalInterfaceMethodSignature() {
1.156 + return functionalInterfaceMethodSignature;
1.157 + }
1.158 +
1.159 + /**
1.160 + * Get the name of the class containing the implementation
1.161 + * method.
1.162 + * @return the name of the class containing the implementation
1.163 + * method
1.164 + */
1.165 + public String getImplClass() {
1.166 + return implClass;
1.167 + }
1.168 +
1.169 + /**
1.170 + * Get the name of the implementation method.
1.171 + * @return the name of the implementation method
1.172 + */
1.173 + public String getImplMethodName() {
1.174 + return implMethodName;
1.175 + }
1.176 +
1.177 + /**
1.178 + * Get the signature of the implementation method.
1.179 + * @return the signature of the implementation method
1.180 + */
1.181 + public String getImplMethodSignature() {
1.182 + return implMethodSignature;
1.183 + }
1.184 +
1.185 + /**
1.186 + * Get the method handle kind (see {@link MethodHandleInfo}) of
1.187 + * the implementation method.
1.188 + * @return the method handle kind of the implementation method
1.189 + */
1.190 + public int getImplMethodKind() {
1.191 + return implMethodKind;
1.192 + }
1.193 +
1.194 + /**
1.195 + * Get the signature of the primary functional interface method
1.196 + * after type variables are substituted with their instantiation
1.197 + * from the capture site.
1.198 + * @return the signature of the primary functional interface method
1.199 + * after type variable processing
1.200 + */
1.201 + public final String getInstantiatedMethodType() {
1.202 + return instantiatedMethodType;
1.203 + }
1.204 +
1.205 + /**
1.206 + * Get the count of dynamic arguments to the lambda capture site.
1.207 + * @return the count of dynamic arguments to the lambda capture site
1.208 + */
1.209 + public int getCapturedArgCount() {
1.210 + return capturedArgs.length;
1.211 + }
1.212 +
1.213 + /**
1.214 + * Get a dynamic argument to the lambda capture site.
1.215 + * @param i the argument to capture
1.216 + * @return a dynamic argument to the lambda capture site
1.217 + */
1.218 + public Object getCapturedArg(int i) {
1.219 + return capturedArgs[i];
1.220 + }
1.221 +
1.222 + private Object readResolve() throws ReflectiveOperationException {
1.223 + try {
1.224 + Method deserialize = AccessController.doPrivileged(new PrivilegedExceptionAction<Method>() {
1.225 + @Override
1.226 + public Method run() throws Exception {
1.227 + Method m = capturingClass.getDeclaredMethod("$deserializeLambda$", SerializedLambda.class);
1.228 + m.setAccessible(true);
1.229 + return m;
1.230 + }
1.231 + });
1.232 +
1.233 + return deserialize.invoke(null, this);
1.234 + }
1.235 + catch (PrivilegedActionException e) {
1.236 + Exception cause = e.getException();
1.237 + if (cause instanceof ReflectiveOperationException)
1.238 + throw (ReflectiveOperationException) cause;
1.239 + else if (cause instanceof RuntimeException)
1.240 + throw (RuntimeException) cause;
1.241 + else
1.242 + throw new RuntimeException("Exception in SerializedLambda.readResolve", e);
1.243 + }
1.244 + }
1.245 +
1.246 + @Override
1.247 + public String toString() {
1.248 + return String.format("SerializedLambda[%s=%s, %s=%s.%s:%s, " +
1.249 + "%s=%s %s.%s:%s, %s=%s, %s=%d]",
1.250 + "capturingClass", capturingClass,
1.251 + "functionalInterfaceMethod", functionalInterfaceClass,
1.252 + functionalInterfaceMethodName,
1.253 + functionalInterfaceMethodSignature,
1.254 + "implementation",
1.255 + null,
1.256 + implClass, implMethodName, implMethodSignature,
1.257 + "instantiatedMethodType", instantiatedMethodType,
1.258 + "numCaptured", capturedArgs.length);
1.259 + }
1.260 +}