// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the copyright holders nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
package org.objectweb.asm;
import java.util.
Arrays;
/**
* A constant whose value is computed at runtime, with a bootstrap method.
*
* @author Remi Forax
*/
public final class
ConstantDynamic {
/** The constant name (can be arbitrary). */
private final
String name;
/** The constant type (must be a field descriptor). */
private final
String descriptor;
/** The bootstrap method to use to compute the constant value at runtime. */
private final
Handle bootstrapMethod;
/**
* The arguments to pass to the bootstrap method, in order to compute the constant value at
* runtime.
*/
private final
Object[]
bootstrapMethodArguments;
/**
* Constructs a new {@link ConstantDynamic}.
*
* @param name the constant name (can be arbitrary).
* @param descriptor the constant type (must be a field descriptor).
* @param bootstrapMethod the bootstrap method to use to compute the constant value at runtime.
* @param bootstrapMethodArguments the arguments to pass to the bootstrap method, in order to
* compute the constant value at runtime.
*/
public
ConstantDynamic(
final
String name,
final
String descriptor,
final
Handle bootstrapMethod,
final
Object...
bootstrapMethodArguments) {
this.
name =
name;
this.
descriptor =
descriptor;
this.
bootstrapMethod =
bootstrapMethod;
this.
bootstrapMethodArguments =
bootstrapMethodArguments;
}
/**
* Returns the name of this constant.
*
* @return the name of this constant.
*/
public
String getName() {
return
name;
}
/**
* Returns the type of this constant.
*
* @return the type of this constant, as a field descriptor.
*/
public
String getDescriptor() {
return
descriptor;
}
/**
* Returns the bootstrap method used to compute the value of this constant.
*
* @return the bootstrap method used to compute the value of this constant.
*/
public
Handle getBootstrapMethod() {
return
bootstrapMethod;
}
/**
* Returns the number of arguments passed to the bootstrap method, in order to compute the value
* of this constant.
*
* @return the number of arguments passed to the bootstrap method, in order to compute the value
* of this constant.
*/
public int
getBootstrapMethodArgumentCount() {
return
bootstrapMethodArguments.length;
}
/**
* Returns an argument passed to the bootstrap method, in order to compute the value of this
* constant.
*
* @param index an argument index, between 0 and {@link #getBootstrapMethodArgumentCount()}
* (exclusive).
* @return the argument passed to the bootstrap method, with the given index.
*/
public
Object getBootstrapMethodArgument(final int
index) {
return
bootstrapMethodArguments[
index];
}
/**
* Returns the arguments to pass to the bootstrap method, in order to compute the value of this
* constant. WARNING: this array must not be modified, and must not be returned to the user.
*
* @return the arguments to pass to the bootstrap method, in order to compute the value of this
* constant.
*/
Object[]
getBootstrapMethodArgumentsUnsafe() {
return
bootstrapMethodArguments;
}
/**
* Returns the size of this constant.
*
* @return the size of this constant, i.e., 2 for {@code long} and {@code double}, 1 otherwise.
*/
public int
getSize() {
char
firstCharOfDescriptor =
descriptor.
charAt(0);
return (
firstCharOfDescriptor == 'J' ||
firstCharOfDescriptor == 'D') ? 2 : 1;
}
@
Override
public boolean
equals(final
Object object) {
if (
object == this) {
return true;
}
if (!(
object instanceof
ConstantDynamic)) {
return false;
}
ConstantDynamic constantDynamic = (
ConstantDynamic)
object;
return
name.
equals(
constantDynamic.
name)
&&
descriptor.
equals(
constantDynamic.
descriptor)
&&
bootstrapMethod.
equals(
constantDynamic.
bootstrapMethod)
&&
Arrays.
equals(
bootstrapMethodArguments,
constantDynamic.
bootstrapMethodArguments);
}
@
Override
public int
hashCode() {
return
name.
hashCode()
^
Integer.
rotateLeft(
descriptor.
hashCode(), 8)
^
Integer.
rotateLeft(
bootstrapMethod.
hashCode(), 16)
^
Integer.
rotateLeft(
Arrays.
hashCode(
bootstrapMethodArguments), 24);
}
@
Override
public
String toString() {
return
name
+ " : "
+
descriptor
+ ' '
+
bootstrapMethod
+ ' '
+
Arrays.
toString(
bootstrapMethodArguments);
}
}