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      1 /*
      2  * Copyright (C) 2010 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 libcore.java.io;
     18 
     19 import java.io.ByteArrayOutputStream;
     20 import java.io.OutputStream;
     21 import java.io.PrintStream;
     22 import java.util.Locale;
     23 
     24 /**
     25  * A PrintStream that throws away its output.
     26  */
     27 public final class NullPrintStream extends PrintStream {
     28     public NullPrintStream() {
     29         // super class complains if argument is null
     30         super((OutputStream) new ByteArrayOutputStream());
     31     }
     32 
     33     @Override
     34     public boolean checkError() {
     35         return false;
     36     }
     37 
     38     @Override
     39     protected void clearError() {}
     40 
     41     @Override
     42     public void close() {}
     43 
     44     @Override
     45     public void flush() {}
     46 
     47     @Override
     48     public PrintStream format(String format, Object... args) {
     49         return this;
     50     }
     51 
     52     @Override
     53     public PrintStream format(Locale l, String format, Object... args) {
     54         return this;
     55     }
     56 
     57     @Override
     58     public PrintStream printf(String format, Object... args) {
     59         return this;
     60     }
     61 
     62     @Override
     63     public PrintStream printf(Locale l, String format, Object... args) {
     64         return this;
     65     }
     66 
     67     @Override
     68     public void print(char[] charArray) {}
     69 
     70     @Override
     71     public void print(char ch) {}
     72 
     73     @Override
     74     public void print(double dnum) {}
     75 
     76     @Override
     77     public void print(float fnum) {}
     78 
     79     @Override
     80     public void print(int inum) {}
     81 
     82     @Override
     83     public void print(long lnum) {}
     84 
     85     @Override
     86     public void print(Object obj) {}
     87 
     88     @Override
     89     public void print(String str) {}
     90 
     91     @Override
     92     public void print(boolean bool) {}
     93 
     94     @Override
     95     public void println() {}
     96 
     97     @Override
     98     public void println(char[] charArray) {}
     99 
    100     @Override
    101     public void println(char ch) {}
    102 
    103     @Override
    104     public void println(double dnum) {}
    105 
    106     @Override
    107     public void println(float fnum) {}
    108 
    109     @Override
    110     public void println(int inum) {}
    111 
    112     @Override
    113     public void println(long lnum) {}
    114 
    115     @Override
    116     public void println(Object obj) {}
    117 
    118     @Override
    119     public void println(String str) {}
    120 
    121     @Override
    122     public void println(boolean bool) {}
    123 
    124     @Override
    125     protected void setError() {}
    126 
    127     @Override
    128     public void write(byte[] buffer, int offset, int length) {}
    129 
    130     @Override
    131     public void write(int oneByte) {}
    132 
    133     @Override
    134     public PrintStream append(char c) {
    135         return this;
    136     }
    137 
    138     @Override
    139     public PrintStream append(CharSequence csq) {
    140         return this;
    141     }
    142 
    143     @Override
    144     public PrintStream append(CharSequence csq, int start, int end) {
    145         return this;
    146     }
    147 }
    148