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      1 /*
      2  * Copyright (C) 2006 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.text;
     18 
     19 
     20 /**
     21  * This is the class for text whose content and markup are immutable.
     22  * For mutable markup, see {@link SpannableString}; for mutable text,
     23  * see {@link SpannableStringBuilder}.
     24  */
     25 public final class SpannedString
     26 extends SpannableStringInternal
     27 implements CharSequence, GetChars, Spanned
     28 {
     29     /**
     30      * @param source source object to copy from
     31      * @param ignoreNoCopySpan whether to copy NoCopySpans in the {@code source}
     32      * @hide
     33      */
     34     public SpannedString(CharSequence source, boolean ignoreNoCopySpan) {
     35         super(source, 0, source.length(), ignoreNoCopySpan);
     36     }
     37 
     38     /**
     39      * For the backward compatibility reasons, this constructor copies all spans including {@link
     40      * android.text.NoCopySpan}.
     41      * @param source source text
     42      */
     43     public SpannedString(CharSequence source) {
     44         this(source, false /* ignoreNoCopySpan */);  // preserve existing NoCopySpan behavior
     45     }
     46 
     47     private SpannedString(CharSequence source, int start, int end) {
     48         // preserve existing NoCopySpan behavior
     49         super(source, start, end, false /* ignoreNoCopySpan */);
     50     }
     51 
     52     public CharSequence subSequence(int start, int end) {
     53         return new SpannedString(this, start, end);
     54     }
     55 
     56     public static SpannedString valueOf(CharSequence source) {
     57         if (source instanceof SpannedString) {
     58             return (SpannedString) source;
     59         } else {
     60             return new SpannedString(source);
     61         }
     62     }
     63 }
     64