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/*
 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.tools.javac.util;

import java.io.IOException;
import java.lang.ref.SoftReference;
import java.nio.CharBuffer;
import javax.tools.JavaFileObject;

import com.sun.tools.javac.file.JavacFileManager;
import com.sun.tools.javac.tree.EndPosTable;

import static com.sun.tools.javac.util.LayoutCharacters.*;

/**
 * A simple abstraction of a source file, as needed for use in a diagnostic message.
 * Provides access to the line and position in a line for any given character offset.
 *
 *  

This is NOT part of any supported API. * If you write code that depends on this, you do so at your own risk. * This code and its internal interfaces are subject to change or * deletion without notice. */ public class DiagnosticSource { /* constant DiagnosticSource to be used when sourcefile is missing */ public static final DiagnosticSource NO_SOURCE = new DiagnosticSource() { @Override protected boolean findLine(int pos) { return false; } }; public DiagnosticSource(JavaFileObject fo, AbstractLog log) { this.fileObject = fo; this.log = log; } private DiagnosticSource() {} /** Return the underlying file object handled by this * DiagnosticSource object. */ public JavaFileObject getFile() { return fileObject; } /** Return the one-based line number associated with a given pos * for the current source file. Zero is returned if no line exists * for the given position. */ public int getLineNumber(int pos) { try { if (findLine(pos)) { return line; } return 0; } finally { buf = null; } } /** Return the one-based column number associated with a given pos * for the current source file. Zero is returned if no column exists * for the given position. */ public int getColumnNumber(int pos, boolean expandTabs) { try { if (findLine(pos)) { int column = 0; for (int bp = lineStart; bp < pos; bp++) { if (bp >= bufLen) { return 0; } if (buf[bp] == '\t' && expandTabs) { column = (column / TabInc * TabInc) + TabInc; } else { column++; } } return column + 1; // positions are one-based } return 0; } finally { buf = null; } } /** Return the content of the line containing a given pos. */ public String getLine(int pos) { try { if (!findLine(pos)) return null; int lineEnd = lineStart; while (lineEnd < bufLen && buf[lineEnd] != CR && buf[lineEnd] != LF) lineEnd++; if (lineEnd - lineStart == 0) return null; return new String(buf, lineStart, lineEnd - lineStart); } finally { buf = null; } } public EndPosTable getEndPosTable() { return endPosTable; } public void setEndPosTable(EndPosTable t) { if (endPosTable != null && endPosTable != t) throw new IllegalStateException("endPosTable already set"); endPosTable = t; } /** Find the line in the buffer that contains the current position * @param pos Character offset into the buffer */ protected boolean findLine(int pos) { if (pos == Position.NOPOS) return false; try { // try and recover buffer from soft reference cache if (buf == null && refBuf != null) buf = refBuf.get(); if (buf == null) { buf = initBuf(fileObject); lineStart = 0; line = 1; } else if (lineStart > pos) { // messages don't come in order lineStart = 0; line = 1; } int bp = lineStart; while (bp < bufLen && bp < pos) { switch (buf[bp++]) { case CR: if (bp < bufLen && buf[bp] == LF) bp++; line++; lineStart = bp; break; case LF: line++; lineStart = bp; break; } } return bp <= bufLen; } catch (IOException e) { log.directError("source.unavailable"); buf = new char[0]; return false; } } protected char[] initBuf(JavaFileObject fileObject) throws IOException { char[] buf; CharSequence cs = fileObject.getCharContent(true); if (cs instanceof CharBuffer) { CharBuffer cb = (CharBuffer) cs; buf = JavacFileManager.toArray(cb); bufLen = cb.limit(); } else { buf = cs.toString().toCharArray(); bufLen = buf.length; } refBuf = new SoftReference(buf); return buf; } /** The underlying file object. */ protected JavaFileObject fileObject; protected EndPosTable endPosTable; /** A soft reference to the content of the file object. */ protected SoftReference refBuf; /** A temporary hard reference to the content of the file object. */ protected char[] buf; /** The length of the content. */ protected int bufLen; /** The start of a line found by findLine. */ protected int lineStart; /** The line number of a line found by findLine. */ protected int line; /** A log for reporting errors, such as errors accessing the content. */ protected AbstractLog log; }





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