jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javap/BasicWriter.java@ed989c347b3c

6852856: javap changes to facilitate subclassing javap for variants
Reviewed-by: mcimadamore

     1 /*

     2  * Copyright 2007-2008 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    26 package com.sun.tools.javap;

    28 import java.io.PrintWriter;

    30 import com.sun.tools.classfile.AttributeException;

    31 import com.sun.tools.classfile.ConstantPoolException;

    32 import com.sun.tools.classfile.DescriptorException;

    34 /*

    35  *  A writer similar to a PrintWriter but which does not hide exceptions.

    36  *  The standard print calls are line-buffered; report calls write messages directly.

    37  *

    38  *  <p><b>This is NOT part of any API supported by Sun Microsystems.  If

    39  *  you write code that depends on this, you do so at your own risk.

    40  *  This code and its internal interfaces are subject to change or

    41  *  deletion without notice.</b>

    42  */

    43 public class BasicWriter {

    44     protected BasicWriter(Context context) {

    45         lineWriter = LineWriter.instance(context);

    46         out = context.get(PrintWriter.class);

    47         messages = context.get(Messages.class);

    48         if (messages == null)

    49             throw new AssertionError();

    50     }

    52     protected void print(String s) {

    53         lineWriter.print(s);

    54     }

    56     protected void print(Object o) {

    57         lineWriter.print(o == null ? null : o.toString());

    58     }

    60     protected void println() {

    61         lineWriter.println();

    62     }

    64     protected void println(String s) {

    65         lineWriter.print(s);

    66         lineWriter.println();

    67     }

    69     protected void println(Object o) {

    70         lineWriter.print(o == null ? null : o.toString());

    71         lineWriter.println();

    72     }

    74     protected String report(AttributeException e) {

    75         out.println("Error: " + e.getMessage()); // i18n?

    76         return "???";

    77     }

    79     protected String report(ConstantPoolException e) {

    80         out.println("Error: " + e.getMessage()); // i18n?

    81         return "???";

    82     }

    84     protected String report(DescriptorException e) {

    85         out.println("Error: " + e.getMessage()); // i18n?

    86         return "???";

    87     }

    89     protected String report(String msg) {

    90         out.println("Error: " + msg); // i18n?

    91         return "???";

    92     }

    94     protected String space(int w) {

    95         if (w < spaces.length && spaces[w] != null)

    96             return spaces[w];

    98         StringBuilder sb = new StringBuilder();

    99         for (int i = 0; i < w; i++)

   100             sb.append(" ");

   102         String s = sb.toString();

   103         if (w < spaces.length)

   104             spaces[w] = s;

   106         return s;

   107     }

   109     private String[] spaces = new String[80];

   111     private LineWriter lineWriter;

   112     private PrintWriter out;

   113     protected Messages messages;

   115     private static class LineWriter {

   116         static LineWriter instance(Context context) {

   117             LineWriter instance = context.get(LineWriter.class);

   118             if (instance == null)

   119                 instance = new LineWriter(context);

   120             return instance;

   121         }

   123         protected LineWriter(Context context) {

   124             context.put(LineWriter.class, this);

   125             out = context.get(PrintWriter.class);

   126             buffer = new StringBuilder();

   127         }

   129         protected void print(String s) {

   130             if (s == null)

   131                 s = "null";

   132             for (int i = 0; i < s.length(); i++) {

   133                 char c = s.charAt(i);

   134                 if (c == '\n') {

   135                     println();

   136                 } else {

   137                     buffer.append(c);

   138                 }

   139             }

   141         }

   143         protected void println() {

   144             out.println(buffer);

   145             buffer.setLength(0);

   146         }

   148         private PrintWriter out;

   149         private StringBuilder buffer;

   150     }

   151 }

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