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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.CstBaseMethodRef;
import com.android.dx.util.AnnotatedOutput;
import com.android.dx.util.Hex;
import java.util.Collection;
import java.util.TreeMap;
/**
* Method refs list section of a {@code .dex} file.
*/
public final class MethodIdsSection extends MemberIdsSection {
/**
* {@code non-null;} map from method constants to {@link
* MethodIdItem} instances
*/
private final TreeMap<CstBaseMethodRef, MethodIdItem> methodIds;
/**
* Constructs an instance. The file offset is initially unknown.
*
* @param file {@code non-null;} file that this instance is part of
*/
public MethodIdsSection(DexFile file) {
super("method_ids", file);
methodIds = new TreeMap<CstBaseMethodRef, MethodIdItem>();
}
/** {@inheritDoc} */
@Override
public Collection<? extends Item> items() {
return methodIds.values();
}
/** {@inheritDoc} */
@Override
public IndexedItem get(Constant cst) {
if (cst == null) {
throw new NullPointerException("cst == null");
}
throwIfNotPrepared();
IndexedItem result = methodIds.get((CstBaseMethodRef) cst);
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 = methodIds.size();
int offset = (sz == 0) ? 0 : getFileOffset();
if (out.annotates()) {
out.annotate(4, "method_ids_size: " + Hex.u4(sz));
out.annotate(4, "method_ids_off: " + Hex.u4(offset));
}
out.writeInt(sz);
out.writeInt(offset);
}
/**
* Interns an element into this instance.
*
* @param method {@code non-null;} the reference to intern
* @return {@code non-null;} the interned reference
*/
public MethodIdItem intern(CstBaseMethodRef method) {
if (method == null) {
throw new NullPointerException("method == null");
}
throwIfPrepared();
MethodIdItem result = methodIds.get(method);
if (result == null) {
result = new MethodIdItem(method);
methodIds.put(method, result);
}
return result;
}
/**
* Gets the index of the given reference, which must have been added
* to this instance.
*
* @param ref {@code non-null;} the reference to look up
* @return {@code >= 0;} the reference's index
*/
public int indexOf(CstBaseMethodRef ref) {
if (ref == null) {
throw new NullPointerException("ref == null");
}
throwIfNotPrepared();
MethodIdItem item = methodIds.get(ref);
if (item == null) {
throw new IllegalArgumentException("not found");
}
return item.getIndex();
}
}
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