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240 lines
8.7 KiB
Java
240 lines
8.7 KiB
Java
/*
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* [The "BSD licence"]
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* Copyright (c) 2010 Ben Gruver (JesusFreke)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.jf.dexlib;
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import org.jf.dexlib.Util.AnnotatedOutput;
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import org.jf.dexlib.Util.Input;
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public class FieldIdItem extends Item<FieldIdItem> {
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private int hashCode = 0;
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private TypeIdItem classType;
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private TypeIdItem fieldType;
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private StringIdItem fieldName;
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/**
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* Creates a new uninitialized <code>FieldIdItem</code>
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* @param dexFile The <code>DexFile</code> that this item belongs to
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*/
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protected FieldIdItem(DexFile dexFile) {
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super(dexFile);
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}
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/**
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* Creates a new <code>FieldIdItem</code> for the given class, type and name
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* @param dexFile The <code>DexFile</code> that this item belongs to
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* @param classType the class that the field is a member of
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* @param fieldType the type of the field
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* @param fieldName the name of the field
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*/
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private FieldIdItem(DexFile dexFile, TypeIdItem classType, TypeIdItem fieldType, StringIdItem fieldName) {
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this(dexFile);
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assert classType.dexFile == dexFile;
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assert fieldType.dexFile == dexFile;
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assert fieldName.dexFile == dexFile;
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this.classType = classType;
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this.fieldType = fieldType;
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this.fieldName = fieldName;
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}
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/**
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* Returns a <code>FieldIdItem</code> for the given values, and that has been interned into
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* the given <code>DexFile</code>
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* @param dexFile The <code>DexFile</code> that this item belongs to
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* @param classType the class that the field is a member of
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* @param fieldType the type of the field
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* @param fieldName the name of the field
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* @return a <code>FieldIdItem</code> for the given values, and that has been interned into
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* the given <code>DexFile</code>
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*/
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public static FieldIdItem internFieldIdItem(DexFile dexFile, TypeIdItem classType, TypeIdItem fieldType,
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StringIdItem fieldName) {
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FieldIdItem fieldIdItem = new FieldIdItem(dexFile, classType, fieldType, fieldName);
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return dexFile.FieldIdsSection.intern(fieldIdItem);
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}
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/**
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* Looks up a <code>FieldIdItem</code> from the given <code>DexFile</code> for the given
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* values
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* @param dexFile The <code>DexFile</code> that this item belongs to
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* @param classType the class that the field is a member of
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* @param fieldType the type of the field
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* @param fieldName the name of the field
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* @return a <code>FieldIdItem</code> from the given <code>DexFile</code> for the given
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* values, or null if it doesn't exist
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*/
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public static FieldIdItem lookupFieldIdItem(DexFile dexFile, TypeIdItem classType, TypeIdItem fieldType,
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StringIdItem fieldName) {
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FieldIdItem fieldIdItem = new FieldIdItem(dexFile, classType, fieldType, fieldName);
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return dexFile.FieldIdsSection.getInternedItem(fieldIdItem);
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}
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/** {@inheritDoc} */
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protected void readItem(Input in, ReadContext readContext) {
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classType = dexFile.TypeIdsSection.getItemByIndex(in.readShort());
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fieldType = dexFile.TypeIdsSection.getItemByIndex(in.readShort());
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fieldName = dexFile.StringIdsSection.getItemByIndex(in.readInt());
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}
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/** {@inheritDoc} */
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protected int placeItem(int offset) {
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return offset + 8;
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}
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/** {@inheritDoc} */
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protected void writeItem(AnnotatedOutput out) {
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if (out.annotates()) {
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out.annotate(2, "class_type: " + classType.getTypeDescriptor());
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out.annotate(2, "field_type: " + fieldType.getTypeDescriptor());
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out.annotate(4, "field_name: " + fieldName.getStringValue());
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}
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int classIndex = classType.getIndex();
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if (classIndex > 0xffff) {
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throw new RuntimeException(String.format("Error writing field_id_item for %s. The type index of " +
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"defining class %s is too large", getFieldString(), classType.getTypeDescriptor()));
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}
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out.writeShort(classIndex);
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int typeIndex = fieldType.getIndex();
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if (typeIndex > 0xffff) {
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throw new RuntimeException(String.format("Error writing field_id_item for %s. The type index of field " +
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"type %s is too large", getFieldString(), fieldType.getTypeDescriptor()));
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}
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out.writeShort(typeIndex);
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out.writeInt(fieldName.getIndex());
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}
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/** {@inheritDoc} */
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public ItemType getItemType() {
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return ItemType.TYPE_FIELD_ID_ITEM;
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}
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/** {@inheritDoc} */
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public String getConciseIdentity() {
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return getFieldString();
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}
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/** {@inheritDoc} */
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public int compareTo(FieldIdItem o) {
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int result = classType.compareTo(o.classType);
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if (result != 0) {
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return result;
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}
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result = fieldName.compareTo(o.fieldName);
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if (result != 0) {
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return result;
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}
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return fieldType.compareTo(o.fieldType);
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}
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/**
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* @return the class that this field is a member of
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*/
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public TypeIdItem getContainingClass() {
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return classType;
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}
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/**
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* @return the type of this field
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*/
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public TypeIdItem getFieldType() {
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return fieldType;
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}
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/**
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* @return the field name
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*/
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public StringIdItem getFieldName() {
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return fieldName;
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}
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String cachedFieldString = null;
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/**
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* @return a string formatted like LclassName;->fieldName:fieldType
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*/
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public String getFieldString() {
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if (cachedFieldString == null) {
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String typeDescriptor = classType.getTypeDescriptor();
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String fieldName = this.fieldName.getStringValue();
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String fieldType = this.fieldType.getTypeDescriptor();
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StringBuffer sb = new StringBuffer(typeDescriptor.length() + fieldName.length() + fieldType.length() + 3);
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sb.append(typeDescriptor);
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sb.append("->");
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sb.append(fieldName);
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sb.append(":");
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sb.append(fieldType);
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cachedFieldString = sb.toString();
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}
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return cachedFieldString;
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}
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/**
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* calculate and cache the hashcode
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*/
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private void calcHashCode() {
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hashCode = classType.hashCode();
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hashCode = 31 * hashCode + fieldType.hashCode();
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hashCode = 31 * hashCode + fieldName.hashCode();
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}
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@Override
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public int hashCode() {
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//there's a small possibility that the actual hash code will be 0. If so, we'll
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//just end up recalculating it each time
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if (hashCode == 0)
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calcHashCode();
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return hashCode;
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}
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@Override
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public boolean equals(Object o) {
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if (this==o) {
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return true;
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}
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if (o==null || !this.getClass().equals(o.getClass())) {
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return false;
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}
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//This assumes that the referenced items have been interned in both objects.
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//This is a valid assumption because all outside code must use the static
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//"getInterned..." style methods to make new items, and any item created
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//internally is guaranteed to be interned
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FieldIdItem other = (FieldIdItem)o;
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return (classType == other.classType &&
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fieldType == other.fieldType &&
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fieldName == other.fieldName);
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}
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} |