// ASM: a very small and fast Java bytecode manipulation framework
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package org.springframework.asm;

import java.util.Arrays;

A constant whose value is computed at runtime, with a bootstrap method.
Author:Remi Forax
/** * 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).
/** The constant name (can be arbitrary). */
private final String name;
The constant type (must be a field descriptor).
/** The constant type (must be a field descriptor). */
private final String descriptor;
The bootstrap method to use to compute the constant value at runtime.
/** 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.
/** * The arguments to pass to the bootstrap method, in order to compute the constant value at * runtime. */
private final Object[] bootstrapMethodArguments;
Constructs a new ConstantDynamic.
Params:
  • name – the constant name (can be arbitrary).
  • descriptor – the constant type (must be a field descriptor).
  • bootstrapMethod – the bootstrap method to use to compute the constant value at runtime.
  • bootstrapMethodArguments – the arguments to pass to the bootstrap method, in order to compute the constant value at runtime.
/** * 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.
Returns:the name of this constant.
/** * Returns the name of this constant. * * @return the name of this constant. */
public String getName() { return name; }
Returns the type of this constant.
Returns:the type of this constant, as a field descriptor.
/** * 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.
Returns:the bootstrap method used to compute the value of this constant.
/** * 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.
Returns:the number of arguments passed to the bootstrap method, in order to compute the value of this constant.
/** * 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.
Params:
Returns:the argument passed to the bootstrap method, with the given index.
/** * 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.
Returns:the arguments to pass to the bootstrap method, in order to compute the value of this constant.
/** * 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.
Returns:the size of this constant, i.e., 2 for long and double, 1 otherwise.
/** * 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); } }