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Android example source code file (SpannableStringInternal.java)

This example Android source code file (SpannableStringInternal.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

android, class, columns, end, flags, indexoutofboundsexception, object, paragraph, reflection, runtimeexception, spannable, spanned, spanwatcher, start, string, util, utilities, utils

The SpannableStringInternal.java Android example source code

/*
 * Copyright (C) 2006 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 com.android.internal.util.ArrayUtils;

import java.lang.reflect.Array;

/* package */ abstract class SpannableStringInternal
{
    /* package */ SpannableStringInternal(CharSequence source,
                                          int start, int end) {
        if (start == 0 && end == source.length())
            mText = source.toString();
        else
            mText = source.toString().substring(start, end);

        int initial = ArrayUtils.idealIntArraySize(0);
        mSpans = new Object[initial];
        mSpanData = new int[initial * 3];

        if (source instanceof Spanned) {
            Spanned sp = (Spanned) source;
            Object[] spans = sp.getSpans(start, end, Object.class);

            for (int i = 0; i < spans.length; i++) {
                int st = sp.getSpanStart(spans[i]);
                int en = sp.getSpanEnd(spans[i]);
                int fl = sp.getSpanFlags(spans[i]);

                if (st < start)
                    st = start;
                if (en > end)
                    en = end;

                setSpan(spans[i], st - start, en - start, fl);
            }
        }
    }

    public final int length() {
        return mText.length();
    }

    public final char charAt(int i) {
        return mText.charAt(i);
    }

    public final String toString() {
        return mText;
    }

    /* subclasses must do subSequence() to preserve type */

    public final void getChars(int start, int end, char[] dest, int off) {
        mText.getChars(start, end, dest, off);
    }

    /* package */ void setSpan(Object what, int start, int end, int flags) {
        int nstart = start;
        int nend = end;

        checkRange("setSpan", start, end);

        if ((flags & Spannable.SPAN_PARAGRAPH) == Spannable.SPAN_PARAGRAPH) {
            if (start != 0 && start != length()) {
                char c = charAt(start - 1);

                if (c != '\n')
                    throw new RuntimeException(
                            "PARAGRAPH span must start at paragraph boundary" +
                            " (" + start + " follows " + c + ")");
            }

            if (end != 0 && end != length()) {
                char c = charAt(end - 1);

                if (c != '\n')
                    throw new RuntimeException(
                            "PARAGRAPH span must end at paragraph boundary" +
                            " (" + end + " follows " + c + ")");
            }
        }

        int count = mSpanCount;
        Object[] spans = mSpans;
        int[] data = mSpanData;

        for (int i = 0; i < count; i++) {
            if (spans[i] == what) {
                int ostart = data[i * COLUMNS + START];
                int oend = data[i * COLUMNS + END];

                data[i * COLUMNS + START] = start;
                data[i * COLUMNS + END] = end;
                data[i * COLUMNS + FLAGS] = flags;

                sendSpanChanged(what, ostart, oend, nstart, nend);
                return;
            }
        }

        if (mSpanCount + 1 >= mSpans.length) {
            int newsize = ArrayUtils.idealIntArraySize(mSpanCount + 1);
            Object[] newtags = new Object[newsize];
            int[] newdata = new int[newsize * 3];

            System.arraycopy(mSpans, 0, newtags, 0, mSpanCount);
            System.arraycopy(mSpanData, 0, newdata, 0, mSpanCount * 3);

            mSpans = newtags;
            mSpanData = newdata;
        }

        mSpans[mSpanCount] = what;
        mSpanData[mSpanCount * COLUMNS + START] = start;
        mSpanData[mSpanCount * COLUMNS + END] = end;
        mSpanData[mSpanCount * COLUMNS + FLAGS] = flags;
        mSpanCount++;

        if (this instanceof Spannable)
            sendSpanAdded(what, nstart, nend);
    }

    /* package */ void removeSpan(Object what) {
        int count = mSpanCount;
        Object[] spans = mSpans;
        int[] data = mSpanData;

        for (int i = count - 1; i >= 0; i--) {
            if (spans[i] == what) {
                int ostart = data[i * COLUMNS + START];
                int oend = data[i * COLUMNS + END];

                int c = count - (i + 1);

                System.arraycopy(spans, i + 1, spans, i, c);
                System.arraycopy(data, (i + 1) * COLUMNS,
                                 data, i * COLUMNS, c * COLUMNS);

                mSpanCount--;

                sendSpanRemoved(what, ostart, oend);
                return;
            }
        }
    }

    public int getSpanStart(Object what) {
        int count = mSpanCount;
        Object[] spans = mSpans;
        int[] data = mSpanData;

        for (int i = count - 1; i >= 0; i--) {
            if (spans[i] == what) {
                return data[i * COLUMNS + START];
            }
        }

        return -1;
    }

    public int getSpanEnd(Object what) {
        int count = mSpanCount;
        Object[] spans = mSpans;
        int[] data = mSpanData;

        for (int i = count - 1; i >= 0; i--) {
            if (spans[i] == what) {
                return data[i * COLUMNS + END];
            }
        }

        return -1;
    }

    public int getSpanFlags(Object what) {
        int count = mSpanCount;
        Object[] spans = mSpans;
        int[] data = mSpanData;

        for (int i = count - 1; i >= 0; i--) {
            if (spans[i] == what) {
                return data[i * COLUMNS + FLAGS];
            }
        }

        return 0; 
    }

    public <T> T[] getSpans(int queryStart, int queryEnd, Class kind) {
        int count = 0;

        int spanCount = mSpanCount;
        Object[] spans = mSpans;
        int[] data = mSpanData;
        Object[] ret = null;
        Object ret1 = null;

        for (int i = 0; i < spanCount; i++) {
            int spanStart = data[i * COLUMNS + START];
            int spanEnd = data[i * COLUMNS + END];

            if (spanStart > queryEnd) {
                continue;
            }
            if (spanEnd < queryStart) {
                continue;
            }

            if (spanStart != spanEnd && queryStart != queryEnd) {
                if (spanStart == queryEnd) {
                    continue;
                }
                if (spanEnd == queryStart) {
                    continue;
                }
            }

            if (kind != null && !kind.isInstance(spans[i])) {
                continue;
            }

            if (count == 0) {
                ret1 = spans[i];
                count++;
            } else {
                if (count == 1) {
                    ret = (Object[]) Array.newInstance(kind, spanCount - i + 1);
                    ret[0] = ret1;
                }

                int prio = data[i * COLUMNS + FLAGS] & Spanned.SPAN_PRIORITY;
                if (prio != 0) {
                    int j;

                    for (j = 0; j < count; j++) {
                        int p = getSpanFlags(ret[j]) & Spanned.SPAN_PRIORITY;

                        if (prio > p) {
                            break;
                        }
                    }

                    System.arraycopy(ret, j, ret, j + 1, count - j);
                    ret[j] = spans[i];
                    count++;
                } else {
                    ret[count++] = spans[i];
                }
            }
        }

        if (count == 0) {
            return (T[]) ArrayUtils.emptyArray(kind);
        }
        if (count == 1) {
            ret = (Object[]) Array.newInstance(kind, 1);
            ret[0] = ret1;
            return (T[]) ret;
        }
        if (count == ret.length) {
            return (T[]) ret;
        }

        Object[] nret = (Object[]) Array.newInstance(kind, count);
        System.arraycopy(ret, 0, nret, 0, count);
        return (T[]) nret;
    }

    public int nextSpanTransition(int start, int limit, Class kind) {
        int count = mSpanCount;
        Object[] spans = mSpans;
        int[] data = mSpanData;

        if (kind == null) {
            kind = Object.class;
        }

        for (int i = 0; i < count; i++) {
            int st = data[i * COLUMNS + START];
            int en = data[i * COLUMNS + END];

            if (st > start && st < limit && kind.isInstance(spans[i]))
                limit = st;
            if (en > start && en < limit && kind.isInstance(spans[i]))
                limit = en;
        }

        return limit;
    }

    private void sendSpanAdded(Object what, int start, int end) {
        SpanWatcher[] recip = getSpans(start, end, SpanWatcher.class);
        int n = recip.length;

        for (int i = 0; i < n; i++) {
            recip[i].onSpanAdded((Spannable) this, what, start, end);
        }
    }

    private void sendSpanRemoved(Object what, int start, int end) {
        SpanWatcher[] recip = getSpans(start, end, SpanWatcher.class);
        int n = recip.length;

        for (int i = 0; i < n; i++) {
            recip[i].onSpanRemoved((Spannable) this, what, start, end);
        }
    }

    private void sendSpanChanged(Object what, int s, int e, int st, int en) {
        SpanWatcher[] recip = getSpans(Math.min(s, st), Math.max(e, en),
                                       SpanWatcher.class);
        int n = recip.length;

        for (int i = 0; i < n; i++) {
            recip[i].onSpanChanged((Spannable) this, what, s, e, st, en);
        }
    }

    private static String region(int start, int end) {
        return "(" + start + " ... " + end + ")";
    }

    private void checkRange(final String operation, int start, int end) {
        if (end < start) {
            throw new IndexOutOfBoundsException(operation + " " +
                                                region(start, end) +
                                                " has end before start");
        }

        int len = length();

        if (start > len || end > len) {
            throw new IndexOutOfBoundsException(operation + " " +
                                                region(start, end) +
                                                " ends beyond length " + len);
        }

        if (start < 0 || end < 0) {
            throw new IndexOutOfBoundsException(operation + " " +
                                                region(start, end) +
                                                " starts before 0");
        }
    }

    private String mText;
    private Object[] mSpans;
    private int[] mSpanData;
    private int mSpanCount;

    /* package */ static final Object[] EMPTY = new Object[0];

    private static final int START = 0;
    private static final int END = 1;
    private static final int FLAGS = 2;
    private static final int COLUMNS = 3;
}

Other Android examples (source code examples)

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