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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.dx.dex.file;
import com.android.dx.rop.cst.Constant;
import com.android.dx.rop.cst.CstType;
import com.android.dx.rop.type.Type;
import com.android.dx.rop.type.TypeList;
import com.android.dx.util.AnnotatedOutput;
import com.android.dx.util.Hex;
import java.util.ArrayList;
import java.util.Collection;
import java.util.TreeMap;
/**
* Class definitions list section of a {@code .dex} file.
*/
public final class ClassDefsSection extends UniformItemSection {
/**
* {@code non-null;} map from type constants for classes to {@link
* ClassDefItem} instances that define those classes
*/
private final TreeMap<Type, ClassDefItem> classDefs;
/** {@code null-ok;} ordered list of classes; set in {@link #orderItems} */
private ArrayList<ClassDefItem> orderedDefs;
/**
* Constructs an instance. The file offset is initially unknown.
*
* @param file {@code non-null;} file that this instance is part of
*/
public ClassDefsSection(DexFile file) {
super("class_defs", file, 4);
classDefs = new TreeMap<Type, ClassDefItem>();
orderedDefs = null;
}
/** {@inheritDoc} */
@Override
public Collection<? extends Item> items() {
if (orderedDefs != null) {
return orderedDefs;
}
return classDefs.values();
}
/** {@inheritDoc} */
@Override
public IndexedItem get(Constant cst) {
if (cst == null) {
throw new NullPointerException("cst == null");
}
throwIfNotPrepared();
Type type = ((CstType) cst).getClassType();
IndexedItem result = classDefs.get(type);
if (result == null) {
throw new IllegalArgumentException("not found");
}
return result;
}
/**
* Writes the portion of the file header that refers to this instance.
*
* @param out {@code non-null;} where to write
*/
public void writeHeaderPart(AnnotatedOutput out) {
throwIfNotPrepared();
int sz = classDefs.size();
int offset = (sz == 0) ? 0 : getFileOffset();
if (out.annotates()) {
out.annotate(4, "class_defs_size: " + Hex.u4(sz));
out.annotate(4, "class_defs_off: " + Hex.u4(offset));
}
out.writeInt(sz);
out.writeInt(offset);
}
/**
* Adds an element to this instance. It is illegal to attempt to add more
* than one class with the same name.
*
* @param clazz {@code non-null;} the class def to add
*/
public void add(ClassDefItem clazz) {
Type type;
try {
type = clazz.getThisClass().getClassType();
} catch (NullPointerException ex) {
// Elucidate the exception.
throw new NullPointerException("clazz == null");
}
throwIfPrepared();
if (classDefs.get(type) != null) {
throw new IllegalArgumentException("already added: " + type);
}
classDefs.put(type, clazz);
}
/** {@inheritDoc} */
@Override
protected void orderItems() {
int sz = classDefs.size();
int idx = 0;
orderedDefs = new ArrayList<ClassDefItem>(sz);
/*
* Iterate over all the classes, recursively assigning an
* index to each, implicitly skipping the ones that have
* already been assigned by the time this (top-level)
* iteration reaches them.
*/
for (Type type : classDefs.keySet()) {
idx = orderItems0(type, idx, sz - idx);
}
}
/**
* Helper for {@link #orderItems}, which recursively assigns indices
* to classes.
*
* @param type {@code null-ok;} type ref to assign, if any
* @param idx {@code >= 0;} the next index to assign
* @param maxDepth maximum recursion depth; if negative, this will
* throw an exception indicating class definition circularity
* @return {@code >= 0;} the next index to assign
*/
private int orderItems0(Type type, int idx, int maxDepth) {
ClassDefItem c = classDefs.get(type);
if ((c == null) || (c.hasIndex())) {
return idx;
}
if (maxDepth < 0) {
throw new RuntimeException("class circularity with " + type);
}
maxDepth--;
CstType superclassCst = c.getSuperclass();
if (superclassCst != null) {
Type superclass = superclassCst.getClassType();
idx = orderItems0(superclass, idx, maxDepth);
}
TypeList interfaces = c.getInterfaces();
int sz = interfaces.size();
for (int i = 0; i < sz; i++) {
idx = orderItems0(interfaces.getType(i), idx, maxDepth);
}
c.setIndex(idx);
orderedDefs.add(c);
return idx + 1;
}
}
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