jjg@46: /*
ohair@554:  * Copyright (c) 2007, 2008, Oracle and/or its affiliates. All rights reserved.
jjg@46:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jjg@46:  *
jjg@46:  * This code is free software; you can redistribute it and/or modify it
jjg@46:  * under the terms of the GNU General Public License version 2 only, as
ohair@554:  * published by the Free Software Foundation.  Oracle designates this
jjg@46:  * particular file as subject to the "Classpath" exception as provided
ohair@554:  * by Oracle in the LICENSE file that accompanied this code.
jjg@46:  *
jjg@46:  * This code is distributed in the hope that it will be useful, but WITHOUT
jjg@46:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jjg@46:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jjg@46:  * version 2 for more details (a copy is included in the LICENSE file that
jjg@46:  * accompanied this code).
jjg@46:  *
jjg@46:  * You should have received a copy of the GNU General Public License version
jjg@46:  * 2 along with this work; if not, write to the Free Software Foundation,
jjg@46:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jjg@46:  *
ohair@554:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@554:  * or visit www.oracle.com if you need additional information or have any
ohair@554:  * questions.
jjg@46:  */
jjg@46: 
jjg@46: package com.sun.tools.javap;
jjg@46: 
jjg@46: import java.io.PrintWriter;
jjg@46: 
jjg@46: import com.sun.tools.classfile.AttributeException;
jjg@46: import com.sun.tools.classfile.ConstantPoolException;
jjg@46: import com.sun.tools.classfile.DescriptorException;
jjg@46: 
jjg@46: /*
jjg@46:  *  A writer similar to a PrintWriter but which does not hide exceptions.
jjg@46:  *  The standard print calls are line-buffered; report calls write messages directly.
jjg@46:  *
jjg@581:  *  <p><b>This is NOT part of any supported API.
jjg@581:  *  If you write code that depends on this, you do so at your own risk.
jjg@46:  *  This code and its internal interfaces are subject to change or
jjg@46:  *  deletion without notice.</b>
jjg@46:  */
jjg@46: public class BasicWriter {
jjg@46:     protected BasicWriter(Context context) {
jjg@46:         lineWriter = LineWriter.instance(context);
jjg@46:         out = context.get(PrintWriter.class);
jjg@283:         messages = context.get(Messages.class);
jjg@283:         if (messages == null)
jjg@283:             throw new AssertionError();
jjg@46:     }
jjg@46: 
jjg@46:     protected void print(String s) {
jjg@46:         lineWriter.print(s);
jjg@46:     }
jjg@46: 
jjg@46:     protected void print(Object o) {
jjg@46:         lineWriter.print(o == null ? null : o.toString());
jjg@46:     }
jjg@46: 
jjg@46:     protected void println() {
jjg@46:         lineWriter.println();
jjg@46:     }
jjg@46: 
jjg@46:     protected void println(String s) {
jjg@46:         lineWriter.print(s);
jjg@46:         lineWriter.println();
jjg@46:     }
jjg@46: 
jjg@46:     protected void println(Object o) {
jjg@46:         lineWriter.print(o == null ? null : o.toString());
jjg@46:         lineWriter.println();
jjg@46:     }
jjg@46: 
jjg@348:     protected void indent(int delta) {
jjg@348:         lineWriter.indent(delta);
jjg@348:     }
jjg@348: 
jjg@348:     protected void tab() {
jjg@348:         lineWriter.tab();
jjg@348:     }
jjg@348: 
jjg@348:     protected void setPendingNewline(boolean b) {
jjg@348:         lineWriter.pendingNewline = b;
jjg@348:     }
jjg@348: 
jjg@46:     protected String report(AttributeException e) {
jjg@46:         out.println("Error: " + e.getMessage()); // i18n?
jjg@46:         return "???";
jjg@46:     }
jjg@46: 
jjg@46:     protected String report(ConstantPoolException e) {
jjg@46:         out.println("Error: " + e.getMessage()); // i18n?
jjg@46:         return "???";
jjg@46:     }
jjg@46: 
jjg@46:     protected String report(DescriptorException e) {
jjg@46:         out.println("Error: " + e.getMessage()); // i18n?
jjg@46:         return "???";
jjg@46:     }
jjg@46: 
jjg@46:     protected String report(String msg) {
jjg@46:         out.println("Error: " + msg); // i18n?
jjg@46:         return "???";
jjg@46:     }
jjg@46: 
jjg@283:     protected String space(int w) {
jjg@283:         if (w < spaces.length && spaces[w] != null)
jjg@283:             return spaces[w];
jjg@283: 
jjg@283:         StringBuilder sb = new StringBuilder();
jjg@283:         for (int i = 0; i < w; i++)
jjg@283:             sb.append(" ");
jjg@283: 
jjg@283:         String s = sb.toString();
jjg@283:         if (w < spaces.length)
jjg@283:             spaces[w] = s;
jjg@283: 
jjg@283:         return s;
jjg@283:     }
jjg@283: 
jjg@283:     private String[] spaces = new String[80];
jjg@283: 
jjg@46:     private LineWriter lineWriter;
jjg@46:     private PrintWriter out;
jjg@283:     protected Messages messages;
jjg@46: 
jjg@46:     private static class LineWriter {
jjg@46:         static LineWriter instance(Context context) {
jjg@46:             LineWriter instance = context.get(LineWriter.class);
jjg@46:             if (instance == null)
jjg@46:                 instance = new LineWriter(context);
jjg@46:             return instance;
jjg@46:         }
jjg@46: 
jjg@46:         protected LineWriter(Context context) {
jjg@46:             context.put(LineWriter.class, this);
jjg@348:             Options options = Options.instance(context);
jjg@348:             indentWidth = options.indentWidth;
jjg@348:             tabColumn = options.tabColumn;
jjg@46:             out = context.get(PrintWriter.class);
jjg@46:             buffer = new StringBuilder();
jjg@46:         }
jjg@46: 
jjg@46:         protected void print(String s) {
jjg@348:             if (pendingNewline) {
jjg@348:                 println();
jjg@348:                 pendingNewline = false;
jjg@348:             }
jjg@46:             if (s == null)
jjg@46:                 s = "null";
jjg@46:             for (int i = 0; i < s.length(); i++) {
jjg@46:                 char c = s.charAt(i);
jjg@348:                 switch (c) {
jjg@348:                     case '\n':
jjg@348:                         println();
jjg@348:                         break;
jjg@348:                     default:
jjg@348:                         if (buffer.length() == 0)
jjg@348:                             indent();
jjg@348:                         buffer.append(c);
jjg@46:                 }
jjg@46:             }
jjg@46: 
jjg@46:         }
jjg@46: 
jjg@46:         protected void println() {
jjg@46:             out.println(buffer);
jjg@46:             buffer.setLength(0);
jjg@46:         }
jjg@46: 
jjg@348:         protected void indent(int delta) {
jjg@348:             indentCount += delta;
jjg@348:         }
jjg@348: 
jjg@348:         protected void tab() {
jjg@348:             if (buffer.length() == 0)
jjg@348:                 indent();
jjg@348:             space(indentCount * indentWidth + tabColumn - buffer.length());
jjg@348:         }
jjg@348: 
jjg@348:         private void indent() {
jjg@348:             space(indentCount * indentWidth);
jjg@348:         }
jjg@348: 
jjg@348:         private void space(int n) {
jjg@348:             for (int i = 0; i < n; i++)
jjg@348:                 buffer.append(' ');
jjg@348:         }
jjg@348: 
jjg@46:         private PrintWriter out;
jjg@46:         private StringBuilder buffer;
jjg@348:         private int indentCount;
jjg@348:         private int indentWidth;
jjg@348:         private int tabColumn;
jjg@348:         private boolean pendingNewline;
jjg@46:     }
jjg@46: }
jjg@46: