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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.jack.dx.util;
import java.util.Arrays;
/**
* A list of labeled items, allowing easy lookup by label.
*/
public class LabeledList extends FixedSizeList {
/**
* Sparse array indexed by label to FixedSizeList index;
* {@code -1} for an invalid label.
*/
private final IntList labelToIndex;
public LabeledList(int size) {
super(size);
labelToIndex = new IntList(size);
}
/**
* Constructs a new instance that is a copy of the old instance.
*
* @param old instance to copy
*/
public LabeledList(LabeledList old) {
super(old.size());
labelToIndex = old.labelToIndex.mutableCopy();
int sz = old.size();
for (int i = 0; i < sz; i++) {
Object one = old.get0(i);
if (one != null) {
set0(i, one);
}
}
}
/**
* Gets the maximum label (exclusive) of any block added to this instance.
*
* @return {@code >= 0;} the maximum label
*/
public final int getMaxLabel() {
int sz = labelToIndex.size();
// Gobble any deleted labels that may be at the end.
int i;
for (i = sz - 1; (i >= 0) && (labelToIndex.get(i) < 0); i--) {
/* empty */
}
int newSize = i + 1;
labelToIndex.shrink(newSize);
return newSize;
}
/**
* Removes a label from the label-to-index mapping.
*
* @param oldLabel label to remove
*/
private void removeLabel(int oldLabel) {
labelToIndex.set(oldLabel, -1);
}
/**
* Adds a label and index to the label-to-index mapping.
*
* @param label new label
* @param index index of block.
*/
private void addLabelIndex(int label, int index) {
int origSz = labelToIndex.size();
for (int i = 0; i <= (label - origSz); i++) {
labelToIndex.add(-1);
}
labelToIndex.set(label, index);
}
/**
* Gets the index of the first item in the list with the given
* label, if any.
*
* @param label {@code >= 0;} the label to look for
* @return {@code >= -1;} the index of the so-labelled item, or {@code -1}
* if none is found
*/
public final int indexOfLabel(int label) {
if (label >= labelToIndex.size()) {
return -1;
} else {
return labelToIndex.get(label);
}
}
/**
* Gets an array containing all of the labels used in this instance,
* in order. The returned array is freshly-allocated and so may be
* modified safely by the caller without impacting this instance.
*
* @return {@code non-null;} ordered array of labels
* @throws NullPointerException thrown if there are any {@code null}
* items in this instance
*/
public final int[] getLabelsInOrder() {
int sz = size();
int[] result = new int[sz];
for (int i = 0; i < sz; i++) {
LabeledItem li = (LabeledItem) get0(i);
if (li == null) {
throw new NullPointerException("null at index " + i);
}
result[i] = li.getLabel();
}
Arrays.sort(result);
return result;
}
@Override
/** @inheritDoc */
public void shrinkToFit() {
super.shrinkToFit();
rebuildLabelToIndex();
}
/**
* Rebuilds the label-to-index mapping after a {@code shrinkToFit()}.
* Note: This assumes that the labels that are in the list are the
* same, although the indicies may have changed.
*/
private void rebuildLabelToIndex() {
int szItems = size();
for (int i = 0; i < szItems; i++) {
LabeledItem li = (LabeledItem) get0(i);
if (li != null) {
labelToIndex.set(li.getLabel(), i);
}
}
}
/**
* Sets the element at the given index.
*
* @param n {@code >= 0, < size();} which element
* @param item {@code null-ok;} the value to store
*/
protected void set(int n, LabeledItem item) {
LabeledItem old = (LabeledItem) getOrNull0(n);
set0(n, item);
if (old != null) {
removeLabel(old.getLabel());
}
if (item != null) {
addLabelIndex(item.getLabel(), n);
}
}
}
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