Java tutorial
// 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; /** * A reference to a field or a method. * * @author Remi Forax * @author Eric Bruneton */ public final class Handle { /** * The kind of field or method designated by this Handle. Should be {@link Opcodes#H_GETFIELD}, * {@link Opcodes#H_GETSTATIC}, {@link Opcodes#H_PUTFIELD}, {@link Opcodes#H_PUTSTATIC}, {@link * Opcodes#H_INVOKEVIRTUAL}, {@link Opcodes#H_INVOKESTATIC}, {@link Opcodes#H_INVOKESPECIAL}, * {@link Opcodes#H_NEWINVOKESPECIAL} or {@link Opcodes#H_INVOKEINTERFACE}. */ private final int tag; /** The internal name of the class that owns the field or method designated by this handle. */ private final String owner; /** The name of the field or method designated by this handle. */ private final String name; /** The descriptor of the field or method designated by this handle. */ private final String descriptor; /** Whether the owner is an interface or not. */ private final boolean isInterface; /** * Constructs a new field or method handle. * * @param tag the kind of field or method designated by this Handle. Must be {@link * Opcodes#H_GETFIELD}, {@link Opcodes#H_GETSTATIC}, {@link Opcodes#H_PUTFIELD}, {@link * Opcodes#H_PUTSTATIC}, {@link Opcodes#H_INVOKEVIRTUAL}, {@link Opcodes#H_INVOKESTATIC}, * {@link Opcodes#H_INVOKESPECIAL}, {@link Opcodes#H_NEWINVOKESPECIAL} or {@link * Opcodes#H_INVOKEINTERFACE}. * @param owner the internal name of the class that owns the field or method designated by this * handle. * @param name the name of the field or method designated by this handle. * @param descriptor the descriptor of the field or method designated by this handle. * @deprecated this constructor has been superseded by {@link #Handle(int, String, String, String, * boolean)}. */ @Deprecated public Handle(final int tag, final String owner, final String name, final String descriptor) { this(tag, owner, name, descriptor, tag == Opcodes.H_INVOKEINTERFACE); } /** * Constructs a new field or method handle. * * @param tag the kind of field or method designated by this Handle. Must be {@link * Opcodes#H_GETFIELD}, {@link Opcodes#H_GETSTATIC}, {@link Opcodes#H_PUTFIELD}, {@link * Opcodes#H_PUTSTATIC}, {@link Opcodes#H_INVOKEVIRTUAL}, {@link Opcodes#H_INVOKESTATIC}, * {@link Opcodes#H_INVOKESPECIAL}, {@link Opcodes#H_NEWINVOKESPECIAL} or {@link * Opcodes#H_INVOKEINTERFACE}. * @param owner the internal name of the class that owns the field or method designated by this * handle. * @param name the name of the field or method designated by this handle. * @param descriptor the descriptor of the field or method designated by this handle. * @param isInterface whether the owner is an interface or not. */ public Handle(final int tag, final String owner, final String name, final String descriptor, final boolean isInterface) { this.tag = tag; this.owner = owner; this.name = name; this.descriptor = descriptor; this.isInterface = isInterface; } /** * Returns the kind of field or method designated by this handle. * * @return {@link Opcodes#H_GETFIELD}, {@link Opcodes#H_GETSTATIC}, {@link Opcodes#H_PUTFIELD}, * {@link Opcodes#H_PUTSTATIC}, {@link Opcodes#H_INVOKEVIRTUAL}, {@link * Opcodes#H_INVOKESTATIC}, {@link Opcodes#H_INVOKESPECIAL}, {@link * Opcodes#H_NEWINVOKESPECIAL} or {@link Opcodes#H_INVOKEINTERFACE}. */ public int getTag() { return tag; } /** * Returns the internal name of the class that owns the field or method designated by this handle. * * @return the internal name of the class that owns the field or method designated by this handle. */ public String getOwner() { return owner; } /** * Returns the name of the field or method designated by this handle. * * @return the name of the field or method designated by this handle. */ public String getName() { return name; } /** * Returns the descriptor of the field or method designated by this handle. * * @return the descriptor of the field or method designated by this handle. */ public String getDesc() { return descriptor; } /** * Returns true if the owner of the field or method designated by this handle is an interface. * * @return true if the owner of the field or method designated by this handle is an interface. */ public boolean isInterface() { return isInterface; } @Override public boolean equals(final Object object) { if (object == this) { return true; } if (!(object instanceof Handle)) { return false; } Handle handle = (Handle) object; return tag == handle.tag && isInterface == handle.isInterface && owner.equals(handle.owner) && name.equals(handle.name) && descriptor.equals(handle.descriptor); } @Override public int hashCode() { return tag + (isInterface ? 64 : 0) + owner.hashCode() * name.hashCode() * descriptor.hashCode(); } /** * Returns the textual representation of this handle. The textual representation is: * * <ul> * <li>for a reference to a class: owner "." name descriptor " (" tag ")", * <li>for a reference to an interface: owner "." name descriptor " (" tag " itf)". * </ul> */ @Override public String toString() { return owner + '.' + name + descriptor + " (" + tag + (isInterface ? " itf" : "") + ')'; } }