1 files changed, 161 insertions, 0 deletions
diff --git a/java/src/com/android/inputmethod/latin/InputPointers.java b/java/src/com/android/inputmethod/latin/InputPointers.java
new file mode 100644
index 000000000..cd53bcd13
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/InputPointers.java
@@ -0,0 +1,161 @@
+/*
+ * Copyright (C) 2012 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.inputmethod.latin;
+
+public class InputPointers {
+    private final ScalableIntArray mXCoordinates = new ScalableIntArray();
+    private final ScalableIntArray mYCoordinates = new ScalableIntArray();
+    private final ScalableIntArray mPointerIds = new ScalableIntArray();
+    private final ScalableIntArray mTimes = new ScalableIntArray();
+
+    public void addPointer(int index, int x, int y, int pointerId, int time) {
+        mXCoordinates.add(index, x);
+        mYCoordinates.add(index, y);
+        mPointerIds.add(index, pointerId);
+        mTimes.add(index, time);
+    }
+
+    public void addPointer(int x, int y, int pointerId, int time) {
+        mXCoordinates.add(x);
+        mYCoordinates.add(y);
+        mPointerIds.add(pointerId);
+        mTimes.add(time);
+    }
+
+    public void set(InputPointers ip) {
+        mXCoordinates.set(ip.mXCoordinates);
+        mYCoordinates.set(ip.mYCoordinates);
+        mPointerIds.set(ip.mPointerIds);
+        mTimes.set(ip.mTimes);
+    }
+
+    public void copy(InputPointers ip) {
+        mXCoordinates.copy(ip.mXCoordinates);
+        mYCoordinates.copy(ip.mYCoordinates);
+        mPointerIds.copy(ip.mPointerIds);
+        mTimes.copy(ip.mTimes);
+    }
+
+    /**
+     * Append the pointers in the specified {@link InputPointers} to the end of this.
+     * @param src the source {@link InputPointers} to append the pointers.
+     * @param startPos the starting index of the pointers in {@code src}.
+     * @param length the number of pointers to be appended.
+     */
+    public void append(InputPointers src, int startPos, int length) {
+        final int currentLength = getPointerSize();
+        final int newLength = currentLength + length;
+        mXCoordinates.ensureCapacity(newLength);
+        mYCoordinates.ensureCapacity(newLength);
+        mPointerIds.ensureCapacity(newLength);
+        mTimes.ensureCapacity(newLength);
+        System.arraycopy(src.getXCoordinates(), startPos, getXCoordinates(), currentLength, length);
+        System.arraycopy(src.getYCoordinates(), startPos, getYCoordinates(), currentLength, length);
+        System.arraycopy(src.getPointerIds(), startPos, getPointerIds(), currentLength, length);
+        System.arraycopy(src.getTimes(), startPos, getTimes(), currentLength, length);
+    }
+
+    public void reset() {
+        mXCoordinates.reset();
+        mYCoordinates.reset();
+        mPointerIds.reset();
+        mTimes.reset();
+    }
+
+    public int getPointerSize() {
+        return mXCoordinates.getLength();
+    }
+
+    public int[] getXCoordinates() {
+        return mXCoordinates.getPrimitiveArray();
+    }
+
+    public int[] getYCoordinates() {
+        return mYCoordinates.getPrimitiveArray();
+    }
+
+    public int[] getPointerIds() {
+        return mPointerIds.getPrimitiveArray();
+    }
+
+    public int[] getTimes() {
+        return mTimes.getPrimitiveArray();
+    }
+
+    private static class ScalableIntArray {
+        private static final int DEFAULT_SIZE = BinaryDictionary.MAX_WORD_LENGTH;
+        private int[] mArray;
+        private int mLength;
+
+        public ScalableIntArray() {
+            reset();
+        }
+
+        public void add(int index, int val) {
+            if (mLength < index + 1) {
+                mLength = index;
+                add(val);
+            } else {
+                mArray[index] = val;
+            }
+        }
+
+        public void add(int val) {
+            final int nextLength = mLength + 1;
+            ensureCapacity(nextLength);
+            mArray[mLength] = val;
+            mLength = nextLength;
+        }
+
+        public void ensureCapacity(int minimumCapacity) {
+            if (mArray.length < minimumCapacity) {
+                final int nextCapacity = mArray.length * 2;
+                grow(minimumCapacity > nextCapacity ? minimumCapacity : nextCapacity);
+            }
+        }
+
+        private void grow(int newCapacity) {
+            final int[] newArray = new int[newCapacity];
+            System.arraycopy(mArray, 0, newArray, 0, mArray.length);
+            mArray = newArray;
+        }
+
+        public int getLength() {
+            return mLength;
+        }
+
+        public void reset() {
+            mArray = new int[DEFAULT_SIZE];
+            mLength = 0;
+        }
+
+        public int[] getPrimitiveArray() {
+            return mArray;
+        }
+
+        public void copy(ScalableIntArray ip) {
+            ensureCapacity(ip.mLength);
+            System.arraycopy(ip.mArray, 0, mArray, 0, ip.mLength);
+            mLength = ip.mLength;
+        }
+
+        public void set(ScalableIntArray ip) {
+            mArray = ip.mArray;
+            mLength = ip.mLength;
+        }
+    }
+}