org.easymock.asm.ConstantDynamic Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of easymock Show documentation
EasyMock provides an easy way to create Mock Objects for interfaces and classes generating them on the fly
There is a newer version: 5.5.0
// 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.easymock.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);
  }
}