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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/* *******************************************************************
 * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *
 * Contributors:
 *     PARC     initial implementation
 * ******************************************************************/


package org.aspectj.ajdt.internal.compiler.lookup;

import java.io.File;

import org.aspectj.ajdt.internal.core.builder.EclipseAdapterUtils;
import org.aspectj.bridge.ISourceLocation;
import org.aspectj.org.eclipse.jdt.core.compiler.IProblem;
import org.aspectj.org.eclipse.jdt.internal.compiler.CompilationResult;
import org.aspectj.org.eclipse.jdt.internal.compiler.env.ICompilationUnit;
import org.aspectj.org.eclipse.jdt.internal.compiler.util.Util;

public class EclipseSourceLocation implements ISourceLocation {
    private static String NO_CONTEXT = "USE_NULL--NO_CONTEXT_AVAILABLE";
	CompilationResult result;
//	EclipseSourceContext eclipseContext;
	int startPos, endPos;
	String filename;
    // lazy but final
    File file;
    int startLine = -1;
    int endLine = -1;
    int column = -1;
    String context;

	public EclipseSourceLocation(CompilationResult result, int startPos, int endPos) {
		super();
		this.result = result;
		if (result!=null && result.fileName!=null) this.filename = new String(result.fileName);
		this.startPos = startPos;
		this.endPos = endPos;
	}

	public CompilationResult getCompilationResult() {
		return result;
	}

	public int getOffset() {
		return startPos;
	}

	public int getStartPos() {
		return startPos;
	}

	public int getEndPos() {
		return endPos;
	}

	public File getSourceFile() {
		if (null == file) {
			if (filename==null) {
//            if ((null == result)
//                || (null == result.fileName)
//                || (0 == result.fileName.length)) {
                file = ISourceLocation.NO_FILE;
            } else {
                file = new File(filename);//new String(result.fileName));
            }
        }
        return file;
	}

	public int getLine() {
		if (-1 == startLine && result!=null) {
            startLine =  Util.getLineNumber(startPos,result.lineSeparatorPositions,0,result.lineSeparatorPositions.length-1);
        }
        return startLine;
	}

	public int getColumn() {
        if (-1 == column) {
            int lineNumber = getLine();
            // JJH added check that lineNumber is in legal range to avoid exceptions
            if (0 < lineNumber && lineNumber < result.lineSeparatorPositions.length) {
                int lineStart = result.lineSeparatorPositions[lineNumber];
                int col = startPos - lineStart; // 1-based
                if (0 <= col) {
                    column = col;
                } else {
                    column = 0;
                }
            } else if (0 < lineNumber && lineNumber == result.lineSeparatorPositions.length) {
            	column = 0;
            }
        }
		return column;
	}

	public int getEndLine() {
        if (-1 == endLine) {
            endLine = Util.getLineNumber(endPos,result.lineSeparatorPositions,0,result.lineSeparatorPositions.length-1);
        }
        return endLine;
	}

    public String getContext() {
        if (null == context) {
            ICompilationUnit compilationUnit = result.compilationUnit;
            IProblem[] problems = result.problems;
            if ((null == compilationUnit) || (null == problems)
                || (1 != problems.length)) { // ?? which of n>1 problems?
                context = NO_CONTEXT;
            } else {
                context = EclipseAdapterUtils.makeLocationContext(compilationUnit, problems[0]);
            }
        }
        return (NO_CONTEXT == context ? null : context);
    }


    /** @return String {file:}line{:column} */
    public String toString() {
        StringBuilder sb = new StringBuilder();

        if (getSourceFile() != ISourceLocation.NO_FILE) {
            sb.append(getSourceFile().getPath());
            sb.append(":");
        }
        sb.append("" + getLine());
        if (getColumn() != 0) {
            sb.append(":" + getColumn());
        }
        if (getOffset()>=0) { sb.append("::").append(getOffset()); }
        return sb.toString();
    }

	private volatile int hashCode = -1;
    public int hashCode() {
    	  if (hashCode == -1) {
            int result = 17;
            // other parts important?
            result = 37*result + getLine();
            result = 37*result + getOffset();
            result = 37*result + (filename==null?0:filename.hashCode());
            hashCode = result;
		}
        return hashCode;
    }

    public boolean equals(Object other) {
        if (! (other instanceof EclipseSourceLocation)) return super.equals(other);
        EclipseSourceLocation o = (EclipseSourceLocation) other;
        return
          getLine()==o.getLine() &&
          getOffset()==o.getOffset() &&
          ((filename==null)?(o.filename==null):o.filename.equals(filename));
    }

	public String getSourceFileName() {
		return null;
	}
}