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authorXavier Ducrohet <xav@android.com>2011-02-22 16:50:11 -0800
committerXavier Ducrohet <xav@android.com>2011-02-23 12:00:41 -0800
commit8cb6fc184dcb9cc6ab0871de5cf430277d15c8c8 (patch)
tree59dbf35999d868ecb3e2b31ede27b56ff21ba34f /tools
parente86c12c9e489e7f04c49a7733fc4014668e012e2 (diff)
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LayoutLib: Import of SparseArray as SparseWeakArray.
This is a straight copy for easy review of the customization. Change-Id: I351ec570c3e7a025561939ab05c1ae7eded30b38
Diffstat (limited to 'tools')
-rw-r--r--tools/layoutlib/bridge/src/com/android/layoutlib/bridge/util/SparseWeakArray.java338
1 files changed, 338 insertions, 0 deletions
diff --git a/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/util/SparseWeakArray.java b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/util/SparseWeakArray.java
new file mode 100644
index 0000000..3c1f627
--- /dev/null
+++ b/tools/layoutlib/bridge/src/com/android/layoutlib/bridge/util/SparseWeakArray.java
@@ -0,0 +1,338 @@
+/*
+ * Copyright (C) 2011 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.layoutlib.bridge.util;
+
+import com.android.internal.util.ArrayUtils;
+
+/**
+ * SparseArrays map integers to Objects. Unlike a normal array of Objects,
+ * there can be gaps in the indices. It is intended to be more efficient
+ * than using a HashMap to map Integers to Objects.
+ */
+public class SparseWeakArray<E> {
+ private static final Object DELETED = new Object();
+ private boolean mGarbage = false;
+
+ /**
+ * Creates a new SparseArray containing no mappings.
+ */
+ public SparseWeakArray() {
+ this(10);
+ }
+
+ /**
+ * Creates a new SparseArray containing no mappings that will not
+ * require any additional memory allocation to store the specified
+ * number of mappings.
+ */
+ public SparseWeakArray(int initialCapacity) {
+ initialCapacity = ArrayUtils.idealIntArraySize(initialCapacity);
+
+ mKeys = new int[initialCapacity];
+ mValues = new Object[initialCapacity];
+ mSize = 0;
+ }
+
+ /**
+ * Gets the Object mapped from the specified key, or <code>null</code>
+ * if no such mapping has been made.
+ */
+ public E get(int key) {
+ return get(key, null);
+ }
+
+ /**
+ * Gets the Object mapped from the specified key, or the specified Object
+ * if no such mapping has been made.
+ */
+ public E get(int key, E valueIfKeyNotFound) {
+ int i = binarySearch(mKeys, 0, mSize, key);
+
+ if (i < 0 || mValues[i] == DELETED) {
+ return valueIfKeyNotFound;
+ } else {
+ return (E) mValues[i];
+ }
+ }
+
+ /**
+ * Removes the mapping from the specified key, if there was any.
+ */
+ public void delete(int key) {
+ int i = binarySearch(mKeys, 0, mSize, key);
+
+ if (i >= 0) {
+ if (mValues[i] != DELETED) {
+ mValues[i] = DELETED;
+ mGarbage = true;
+ }
+ }
+ }
+
+ /**
+ * Alias for {@link #delete(int)}.
+ */
+ public void remove(int key) {
+ delete(key);
+ }
+
+ /**
+ * Removes the mapping at the specified index.
+ */
+ public void removeAt(int index) {
+ if (mValues[index] != DELETED) {
+ mValues[index] = DELETED;
+ mGarbage = true;
+ }
+ }
+
+ private void gc() {
+ // Log.e("SparseArray", "gc start with " + mSize);
+
+ int n = mSize;
+ int o = 0;
+ int[] keys = mKeys;
+ Object[] values = mValues;
+
+ for (int i = 0; i < n; i++) {
+ Object val = values[i];
+
+ if (val != DELETED) {
+ if (i != o) {
+ keys[o] = keys[i];
+ values[o] = val;
+ }
+
+ o++;
+ }
+ }
+
+ mGarbage = false;
+ mSize = o;
+
+ // Log.e("SparseArray", "gc end with " + mSize);
+ }
+
+ /**
+ * Adds a mapping from the specified key to the specified value,
+ * replacing the previous mapping from the specified key if there
+ * was one.
+ */
+ public void put(int key, E value) {
+ int i = binarySearch(mKeys, 0, mSize, key);
+
+ if (i >= 0) {
+ mValues[i] = value;
+ } else {
+ i = ~i;
+
+ if (i < mSize && mValues[i] == DELETED) {
+ mKeys[i] = key;
+ mValues[i] = value;
+ return;
+ }
+
+ if (mGarbage && mSize >= mKeys.length) {
+ gc();
+
+ // Search again because indices may have changed.
+ i = ~binarySearch(mKeys, 0, mSize, key);
+ }
+
+ if (mSize >= mKeys.length) {
+ int n = ArrayUtils.idealIntArraySize(mSize + 1);
+
+ int[] nkeys = new int[n];
+ Object[] nvalues = new Object[n];
+
+ // Log.e("SparseArray", "grow " + mKeys.length + " to " + n);
+ System.arraycopy(mKeys, 0, nkeys, 0, mKeys.length);
+ System.arraycopy(mValues, 0, nvalues, 0, mValues.length);
+
+ mKeys = nkeys;
+ mValues = nvalues;
+ }
+
+ if (mSize - i != 0) {
+ // Log.e("SparseArray", "move " + (mSize - i));
+ System.arraycopy(mKeys, i, mKeys, i + 1, mSize - i);
+ System.arraycopy(mValues, i, mValues, i + 1, mSize - i);
+ }
+
+ mKeys[i] = key;
+ mValues[i] = value;
+ mSize++;
+ }
+ }
+
+ /**
+ * Returns the number of key-value mappings that this SparseArray
+ * currently stores.
+ */
+ public int size() {
+ if (mGarbage) {
+ gc();
+ }
+
+ return mSize;
+ }
+
+ /**
+ * Given an index in the range <code>0...size()-1</code>, returns
+ * the key from the <code>index</code>th key-value mapping that this
+ * SparseArray stores.
+ */
+ public int keyAt(int index) {
+ if (mGarbage) {
+ gc();
+ }
+
+ return mKeys[index];
+ }
+
+ /**
+ * Given an index in the range <code>0...size()-1</code>, returns
+ * the value from the <code>index</code>th key-value mapping that this
+ * SparseArray stores.
+ */
+ public E valueAt(int index) {
+ if (mGarbage) {
+ gc();
+ }
+
+ return (E) mValues[index];
+ }
+
+ /**
+ * Given an index in the range <code>0...size()-1</code>, sets a new
+ * value for the <code>index</code>th key-value mapping that this
+ * SparseArray stores.
+ */
+ public void setValueAt(int index, E value) {
+ if (mGarbage) {
+ gc();
+ }
+
+ mValues[index] = value;
+ }
+
+ /**
+ * Returns the index for which {@link #keyAt} would return the
+ * specified key, or a negative number if the specified
+ * key is not mapped.
+ */
+ public int indexOfKey(int key) {
+ if (mGarbage) {
+ gc();
+ }
+
+ return binarySearch(mKeys, 0, mSize, key);
+ }
+
+ /**
+ * Returns an index for which {@link #valueAt} would return the
+ * specified key, or a negative number if no keys map to the
+ * specified value.
+ * Beware that this is a linear search, unlike lookups by key,
+ * and that multiple keys can map to the same value and this will
+ * find only one of them.
+ */
+ public int indexOfValue(E value) {
+ if (mGarbage) {
+ gc();
+ }
+
+ for (int i = 0; i < mSize; i++)
+ if (mValues[i] == value)
+ return i;
+
+ return -1;
+ }
+
+ /**
+ * Removes all key-value mappings from this SparseArray.
+ */
+ public void clear() {
+ int n = mSize;
+ Object[] values = mValues;
+
+ for (int i = 0; i < n; i++) {
+ values[i] = null;
+ }
+
+ mSize = 0;
+ mGarbage = false;
+ }
+
+ /**
+ * Puts a key/value pair into the array, optimizing for the case where
+ * the key is greater than all existing keys in the array.
+ */
+ public void append(int key, E value) {
+ if (mSize != 0 && key <= mKeys[mSize - 1]) {
+ put(key, value);
+ return;
+ }
+
+ if (mGarbage && mSize >= mKeys.length) {
+ gc();
+ }
+
+ int pos = mSize;
+ if (pos >= mKeys.length) {
+ int n = ArrayUtils.idealIntArraySize(pos + 1);
+
+ int[] nkeys = new int[n];
+ Object[] nvalues = new Object[n];
+
+ // Log.e("SparseArray", "grow " + mKeys.length + " to " + n);
+ System.arraycopy(mKeys, 0, nkeys, 0, mKeys.length);
+ System.arraycopy(mValues, 0, nvalues, 0, mValues.length);
+
+ mKeys = nkeys;
+ mValues = nvalues;
+ }
+
+ mKeys[pos] = key;
+ mValues[pos] = value;
+ mSize = pos + 1;
+ }
+
+ private static int binarySearch(int[] a, int start, int len, int key) {
+ int high = start + len, low = start - 1, guess;
+
+ while (high - low > 1) {
+ guess = (high + low) / 2;
+
+ if (a[guess] < key)
+ low = guess;
+ else
+ high = guess;
+ }
+
+ if (high == start + len)
+ return ~(start + len);
+ else if (a[high] == key)
+ return high;
+ else
+ return ~high;
+ }
+
+ private int[] mKeys;
+ private Object[] mValues;
+ private int mSize;
+}
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