| /* |
| * [The "BSD licence"] |
| * Copyright (c) 2010 Ben Gruver (JesusFreke) |
| * 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. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.jf.dexlib; |
| |
| import org.jf.dexlib.Util.AnnotatedOutput; |
| import org.jf.dexlib.Util.Input; |
| |
| public class MethodIdItem extends Item<MethodIdItem> implements Convertible<MethodIdItem> { |
| private int hashCode = 0; |
| |
| private TypeIdItem classType; |
| private ProtoIdItem methodPrototype; |
| private StringIdItem methodName; |
| |
| /** |
| * Creates a new uninitialized <code>MethodIdItem</code> |
| * @param dexFile The <code>DexFile</code> that this item belongs to |
| */ |
| protected MethodIdItem(DexFile dexFile) { |
| super(dexFile); |
| } |
| |
| /** |
| * Creates a new <code>MethodIdItem</code> for the given class, type and name |
| * @param dexFile The <code>DexFile</code> that this item belongs to |
| * @param classType the class that the method is a member of |
| * @param methodPrototype the type of the method |
| * @param methodName the name of the method |
| */ |
| private MethodIdItem(DexFile dexFile, TypeIdItem classType, ProtoIdItem methodPrototype, StringIdItem methodName) { |
| this(dexFile); |
| this.classType = classType; |
| this.methodPrototype = methodPrototype; |
| this.methodName = methodName; |
| } |
| |
| /** |
| * Returns a <code>MethodIdItem</code> for the given values, and that has been interned into |
| * the given <code>DexFile</code> |
| * @param dexFile The <code>DexFile</code> that this item belongs to |
| * @param classType the class that the method is a member of |
| * @param methodPrototype the type of the method |
| * @param methodName the name of the method |
| * @return a <code>MethodIdItem</code> for the given values, and that has been interned into |
| * the given <code>DexFile</code> |
| */ |
| public static MethodIdItem internMethodIdItem(DexFile dexFile, TypeIdItem classType, |
| ProtoIdItem methodPrototype, StringIdItem methodName) { |
| MethodIdItem methodIdItem = new MethodIdItem(dexFile, classType, methodPrototype, methodName); |
| return dexFile.MethodIdsSection.intern(methodIdItem); |
| } |
| |
| /** |
| * Looks up a <code>MethodIdItem</code> from the given <code>DexFile</code> for the given |
| * values |
| * @param dexFile The <code>DexFile</code> that this item belongs to |
| * @param classType the class that the method is a member of |
| * @param methodPrototype the type of the method |
| * @param methodName the name of the method |
| * @return a <code>MethodIdItem</code> from the given <code>DexFile</code> for the given |
| * values, or null if it doesn't exist |
| */ |
| public static MethodIdItem lookupMethodIdItem(DexFile dexFile, TypeIdItem classType, |
| ProtoIdItem methodPrototype, StringIdItem methodName) { |
| MethodIdItem methodIdItem = new MethodIdItem(dexFile, classType, methodPrototype, methodName); |
| return dexFile.MethodIdsSection.getInternedItem(methodIdItem); |
| } |
| |
| /** {@inheritDoc} */ |
| protected void readItem(Input in, ReadContext readContext) { |
| classType = dexFile.TypeIdsSection.getItemByIndex(in.readShort()); |
| methodPrototype = dexFile.ProtoIdsSection.getItemByIndex(in.readShort()); |
| methodName = dexFile.StringIdsSection.getItemByIndex(in.readInt()); |
| } |
| |
| /** {@inheritDoc} */ |
| protected int placeItem(int offset) { |
| return offset + 8; |
| } |
| |
| /** {@inheritDoc} */ |
| protected void writeItem(AnnotatedOutput out) { |
| if (out.annotates()) { |
| out.annotate(2, "class_type: " + classType.getTypeDescriptor()); |
| out.annotate(2, "method_prototype: " + methodPrototype.getPrototypeString()); |
| out.annotate(4, "method_name: " + methodName.getStringValue()); |
| } |
| |
| int classIndex = classType.getIndex(); |
| if (classIndex > 0xffff) { |
| throw new RuntimeException(String.format("Error writing method_id_item for %s. The type index of " + |
| "defining class %s is too large", getMethodString(), classType.getTypeDescriptor())); |
| } |
| out.writeShort(classIndex); |
| |
| int prototypeIndex = methodPrototype.getIndex(); |
| if (prototypeIndex > 0xffff) { |
| throw new RuntimeException(String.format("Error writing method_id_item for %0. The prototype index of " + |
| "method prototype %s is too large", getMethodString(), methodPrototype.getPrototypeString())); |
| } |
| out.writeShort(prototypeIndex); |
| |
| out.writeInt(methodName.getIndex()); |
| } |
| |
| /** {@inheritDoc} */ |
| public ItemType getItemType() { |
| return ItemType.TYPE_METHOD_ID_ITEM; |
| } |
| |
| /** {@inheritDoc} */ |
| public String getConciseIdentity() { |
| return "method_id_item: " + getMethodString(); |
| } |
| |
| /** {@inheritDoc} */ |
| public int compareTo(MethodIdItem o) { |
| int result = classType.compareTo(o.classType); |
| if (result != 0) { |
| return result; |
| } |
| |
| result = methodName.compareTo(o.methodName); |
| if (result != 0) { |
| return result; |
| } |
| |
| return methodPrototype.compareTo(o.methodPrototype); |
| } |
| |
| private String cachedMethodString = null; |
| /** |
| * @return a string formatted like LclassName;->methodName(TTTT..)R |
| */ |
| public String getMethodString() { |
| if (cachedMethodString == null) { |
| String classType = this.classType.getTypeDescriptor(); |
| String methodName = this.methodName.getStringValue(); |
| String prototypeString = methodPrototype.getPrototypeString(); |
| |
| StringBuilder sb = new StringBuilder(classType.length() + methodName.length() + prototypeString.length() + |
| 2); |
| sb.append(classType); |
| sb.append("->"); |
| sb.append(methodName); |
| sb.append(prototypeString); |
| cachedMethodString = sb.toString(); |
| } |
| return cachedMethodString; |
| } |
| |
| private String cachedShortMethodString = null; |
| /** |
| * @return a string formatted like methodName(TTTT..)R |
| */ |
| public String getShortMethodString() { |
| if (cachedShortMethodString == null) { |
| String methodName = this.methodName.getStringValue(); |
| String prototypeString = methodPrototype.getPrototypeString(); |
| |
| StringBuilder sb = new StringBuilder(methodName.length() + prototypeString.length()); |
| sb.append(methodName); |
| sb.append(prototypeString); |
| cachedShortMethodString = sb.toString(); |
| } |
| return cachedShortMethodString; |
| } |
| |
| /** |
| * @return the method prototype |
| */ |
| public ProtoIdItem getPrototype() { |
| return methodPrototype; |
| } |
| |
| /** |
| * @return the name of the method |
| */ |
| public StringIdItem getMethodName() { |
| return methodName; |
| } |
| |
| /** |
| * @return the class this method is a member of |
| */ |
| public TypeIdItem getContainingClass() { |
| return classType; |
| } |
| |
| /** |
| * calculate and cache the hashcode |
| */ |
| private void calcHashCode() { |
| hashCode = classType.hashCode(); |
| hashCode = 31 * hashCode + methodPrototype.hashCode(); |
| hashCode = 31 * hashCode + methodName.hashCode(); |
| } |
| |
| @Override |
| public int hashCode() { |
| //there's a small possibility that the actual hash code will be 0. If so, we'll |
| //just end up recalculating it each time |
| if (hashCode == 0) |
| calcHashCode(); |
| return hashCode; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this==o) { |
| return true; |
| } |
| if (o==null || !this.getClass().equals(o.getClass())) { |
| return false; |
| } |
| |
| //This assumes that the referenced items have been interned in both objects. |
| //This is a valid assumption because all outside code must use the static |
| //"getInterned..." style methods to make new items, and any item created |
| //internally is guaranteed to be interned |
| MethodIdItem other = (MethodIdItem)o; |
| return (classType == other.classType && |
| methodPrototype == other.methodPrototype && |
| methodName == other.methodName); |
| } |
| |
| public MethodIdItem convert() { |
| return this; |
| } |
| } |