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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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package java.lang.invoke;

import java.io.Serializable;

import java.lang.reflect.Method;

import java.security.AccessController;

import java.security.PrivilegedActionException;

import java.security.PrivilegedExceptionAction;

import java.util.Objects;

/**

 * Serialized form of a lambda expression.  The properties of this class represent the information that is present

 * at the lambda factory site, including the identity of the primary functional interface method, the identity of the

 * implementation method, and any variables captured from the local environment at the time of lambda capture.

 *

 * @see LambdaMetafactory

 */

public final class SerializedLambda implements Serializable {

    private static final long serialVersionUID = 8025925345765570181L;

    private final Class<?> capturingClass;

    private final String functionalInterfaceClass;

    private final String functionalInterfaceMethodName;

    private final String functionalInterfaceMethodSignature;

    private final int functionalInterfaceMethodKind;

    private final String implClass;

    private final String implMethodName;

    private final String implMethodSignature;

    private final int implMethodKind;

    private final String instantiatedMethodType;

    private final Object[] capturedArgs;

    /**

     * Create a {@code SerializedLambda} from the low-level information present at the lambda factory site.

     *

     * @param capturingClass The class in which the lambda expression appears

     * @param functionalInterfaceMethodKind Method handle kind (see {@link MethodHandleInfo}) for the

     *                                      functional interface method handle present at the lambda factory site

     * @param functionalInterfaceClass Name, in slash-delimited form, for the functional interface class present at the

     *                                 lambda factory site

     * @param functionalInterfaceMethodName Name of the primary method for the functional interface present at the

     *                                      lambda factory site

     * @param functionalInterfaceMethodSignature Signature of the primary method for the functional interface present

     *                                           at the lambda factory site

     * @param implMethodKind Method handle kind for the implementation method

     * @param implClass Name, in slash-delimited form, for the class holding the implementation method

     * @param implMethodName Name of the implementation method

     * @param implMethodSignature Signature of the implementation method

     * @param instantiatedMethodType The signature of the primary functional interface method after type variables

     *                               are substituted with their instantiation from the capture site

     * @param capturedArgs The dynamic arguments to the lambda factory site, which represent variables captured by

     *                     the lambda

     */

    public SerializedLambda(Class<?> capturingClass,

                            int functionalInterfaceMethodKind,

                            String functionalInterfaceClass,

                            String functionalInterfaceMethodName,

                            String functionalInterfaceMethodSignature,

                            int implMethodKind,

                            String implClass,

                            String implMethodName,

                            String implMethodSignature,

                            String instantiatedMethodType,

                            Object[] capturedArgs) {

        this.capturingClass = capturingClass;

        this.functionalInterfaceMethodKind = functionalInterfaceMethodKind;

        this.functionalInterfaceClass = functionalInterfaceClass;

        this.functionalInterfaceMethodName = functionalInterfaceMethodName;

        this.functionalInterfaceMethodSignature = functionalInterfaceMethodSignature;

        this.implMethodKind = implMethodKind;

        this.implClass = implClass;

        this.implMethodName = implMethodName;

        this.implMethodSignature = implMethodSignature;

        this.instantiatedMethodType = instantiatedMethodType;

        this.capturedArgs = Objects.requireNonNull(capturedArgs).clone();

    }

    public String getCapturingClass() {

        return capturingClass.getName().replace('.', '/');

    }

    public String getFunctionalInterfaceClass() {

        return functionalInterfaceClass;

    }

    public String getFunctionalInterfaceMethodName() {

        return functionalInterfaceMethodName;

    }

    public String getFunctionalInterfaceMethodSignature() {

        return functionalInterfaceMethodSignature;

    }

    public int getFunctionalInterfaceMethodKind() {

        return functionalInterfaceMethodKind;

    }

    public String getImplClass() {

        return implClass;

    }

    public String getImplMethodName() {

        return implMethodName;

    }

    public String getImplMethodSignature() {

        return implMethodSignature;

    }

    public int getImplMethodKind() {

        return implMethodKind;

    }

    /**

     */

    public final String getInstantiatedMethodType() {

        return instantiatedMethodType;

    }

    public int getCapturedArgCount() {

        return capturedArgs.length;

    }

    public Object getCapturedArg(int i) {

        return capturedArgs[i];

    }

    private Object readResolve() throws ReflectiveOperationException {

        try {

            Method deserialize = AccessController.doPrivileged(new PrivilegedExceptionAction<Method>() {

                @Override

                public Method run() throws Exception {

                    Method m = capturingClass.getDeclaredMethod("$deserializeLambda$", SerializedLambda.class);

                    m.setAccessible(true);

                    return m;

                }

            });

            return deserialize.invoke(null, this);

        }

        catch (PrivilegedActionException e) {

            Exception cause = e.getException();

            if (cause instanceof ReflectiveOperationException)

                throw (ReflectiveOperationException) cause;

            else if (cause instanceof RuntimeException)

                throw (RuntimeException) cause;

            else

                throw new RuntimeException("Exception in SerializedLambda.readResolve", e);

        }

    }

    @Override

    public String toString() {

        return String.format("SerializedLambda[capturingClass=%s, functionalInterfaceMethod=%s %s.%s:%s, " +

                             "implementation=%s %s.%s:%s, instantiatedMethodType=%s, numCaptured=%d]",

                             capturingClass, MethodHandleInfo.getReferenceKindString(functionalInterfaceMethodKind),

                             functionalInterfaceClass, functionalInterfaceMethodName, functionalInterfaceMethodSignature,

                             MethodHandleInfo.getReferenceKindString(implMethodKind), implClass, implMethodName,

                             implMethodSignature, instantiatedMethodType, capturedArgs.length);

    }

}