New SpanSet class extracted from TextLine. (4ffb879f) · Commits · e / os / android_frameworks_base

core/java/android/text/SpanSet.java

0 → 100644

+111 −0

Original line number	Diff line number	Diff line
		/*
		* 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 android.text;

		import java.lang.reflect.Array;

		/**
		* A cached set of spans. Caches the result of {@link Spanned#getSpans(int, int, Class)} and then
		* provides faster access to {@link Spanned#nextSpanTransition(int, int, Class)}.
		*
		* Fields are left public for a convenient direct access.
		*
		* Note that empty spans are ignored by this class.
		* @hide
		*/
		public class SpanSet<E> {
		private final Class<? extends E> classType;

		int numberOfSpans;
		E[] spans;
		int[] spanStarts;
		int[] spanEnds;
		int[] spanFlags;

		SpanSet(Class<? extends E> type) {
		classType = type;
		numberOfSpans = 0;
		}

		@SuppressWarnings("unchecked")
		public void init(Spanned spanned, int start, int limit) {
		final E[] allSpans = spanned.getSpans(start, limit, classType);
		final int length = allSpans.length;

		if (length > 0 && (spans == null \|\| spans.length < length)) {
		// These arrays may end up being too large because of the discarded empty spans
		spans = (E[]) Array.newInstance(classType, length);
		spanStarts = new int[length];
		spanEnds = new int[length];
		spanFlags = new int[length];
		}

		numberOfSpans = 0;
		for (int i = 0; i < length; i++) {
		final E span = allSpans[i];

		final int spanStart = spanned.getSpanStart(span);
		final int spanEnd = spanned.getSpanEnd(span);
		if (spanStart == spanEnd) continue;

		final int spanFlag = spanned.getSpanFlags(span);

		spans[numberOfSpans] = span;
		spanStarts[numberOfSpans] = spanStart;
		spanEnds[numberOfSpans] = spanEnd;
		spanFlags[numberOfSpans] = spanFlag;

		numberOfSpans++;
		}
		}

		/**
		* Returns true if there are spans intersecting the given interval.
		* @param end must be strictly greater than start
		*/
		public boolean hasSpansIntersecting(int start, int end) {
		for (int i = 0; i < numberOfSpans; i++) {
		// equal test is valid since both intervals are not empty by construction
		if (spanStarts[i] >= end \|\| spanEnds[i] <= start) continue;
		return true;
		}
		return false;
		}

		/**
		* Similar to {@link Spanned#nextSpanTransition(int, int, Class)}
		*/
		int getNextTransition(int start, int limit) {
		for (int i = 0; i < numberOfSpans; i++) {
		final int spanStart = spanStarts[i];
		final int spanEnd = spanEnds[i];
		if (spanStart > start && spanStart < limit) limit = spanStart;
		if (spanEnd > start && spanEnd < limit) limit = spanEnd;
		}
		return limit;
		}

		/**
		* Removes all internal references to the spans to avoid memory leaks.
		*/
		public void recycle() {
		// The spans array is guaranteed to be not null when numberOfSpans is > 0
		for (int i = 0; i < numberOfSpans; i++) {
		spans[i] = null; // prevent a leak: no reference kept when TextLine is recycled
		}
		}
		}

core/java/android/text/TextLine.java

+0 −74

Original line number	Diff line number	Diff line
		@@ -30,8 +30,6 @@ import android.util.Log;

		import com.android.internal.util.ArrayUtils;

		import java.lang.reflect.Array;

		/**
		* Represents a line of styled text, for measuring in visual order and
		* for rendering.
		@@ -860,78 +858,6 @@ class TextLine {
		return runIsRtl ? -ret : ret;
		}

		private static class SpanSet<E> {
		int numberOfSpans;
		E[] spans;
		int[] spanStarts;
		int[] spanEnds;
		int[] spanFlags;
		final Class<? extends E> classType;

		SpanSet(Class<? extends E> type) {
		classType = type;
		numberOfSpans = 0;
		}

		@SuppressWarnings("unchecked")
		public void init(Spanned spanned, int start, int limit) {
		final E[] allSpans = spanned.getSpans(start, limit, classType);
		final int length = allSpans.length;

		if (length > 0 && (spans == null \|\| spans.length < length)) {
		// These arrays may end up being too large because of empty spans
		spans = (E[]) Array.newInstance(classType, length);
		spanStarts = new int[length];
		spanEnds = new int[length];
		spanFlags = new int[length];
		}

		numberOfSpans = 0;
		for (int i = 0; i < length; i++) {
		final E span = allSpans[i];

		final int spanStart = spanned.getSpanStart(span);
		final int spanEnd = spanned.getSpanEnd(span);
		if (spanStart == spanEnd) continue;

		final int spanFlag = spanned.getSpanFlags(span);

		spans[numberOfSpans] = span;
		spanStarts[numberOfSpans] = spanStart;
		spanEnds[numberOfSpans] = spanEnd;
		spanFlags[numberOfSpans] = spanFlag;

		numberOfSpans++;
		}
		}

		public boolean hasSpansIntersecting(int start, int end) {
		for (int i = 0; i < numberOfSpans; i++) {
		// equal test is valid since both intervals are not empty by construction
		if (spanStarts[i] >= end \|\| spanEnds[i] <= start) continue;
		return true;
		}
		return false;
		}

		int getNextTransition(int start, int limit) {
		for (int i = 0; i < numberOfSpans; i++) {
		final int spanStart = spanStarts[i];
		final int spanEnd = spanEnds[i];
		if (spanStart > start && spanStart < limit) limit = spanStart;
		if (spanEnd > start && spanEnd < limit) limit = spanEnd;
		}
		return limit;
		}

		public void recycle() {
		// The spans array is guaranteed to be not null when numberOfSpans is > 0
		for (int i = 0; i < numberOfSpans; i++) {
		spans[i] = null; // prevent a leak: no reference kept when TextLine is recycled
		}
		}
		}

		/**
		* Utility function for handling a unidirectional run. The run must not
		* contain tabs or emoji but can contain styles.