/* *******************************************************************
 * 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 v1.0 
 * which accompanies this distribution and is available at 
 * http://www.eclipse.org/legal/epl-v10.html 
 *  
 * Contributors: 
 *     PARC     initial implementation 
 * ******************************************************************/


package org.aspectj.ajdt.internal.core.builder;

import java.io.File;

import org.aspectj.ajdt.internal.compiler.lookup.EclipseSourceLocation;
import org.aspectj.bridge.ISourceLocation;
import org.aspectj.bridge.SourceLocation;
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.CompilationResult.ProblemsForRemovalFilter;
import org.aspectj.weaver.IEclipseSourceContext;
import org.aspectj.weaver.IHasPosition;
import org.aspectj.weaver.Member;


public class EclipseSourceContext implements IEclipseSourceContext {
	
	CompilationResult result;
	int offset = 0;

	public EclipseSourceContext(CompilationResult result) {
		this.result = result;
	}
	
	public EclipseSourceContext(CompilationResult result, int offset) {
		this.result = result;
		this.offset = offset;
	}
	
	public int getOffset() {
		return offset;
	}
	
	private File getSourceFile() {
		return new File(new String(result.fileName));
	}

	public ISourceLocation makeSourceLocation(IHasPosition position) {
		return new EclipseSourceLocation(result, position.getStart(), position.getEnd());
	}

    public ISourceLocation makeSourceLocation(int line, int offset) {
		SourceLocation sl = new SourceLocation(getSourceFile(), line);

        if (offset > 0) {
            sl.setOffset(offset);
        } else {
            // compute the offset
            //TODO AV - should we do it lazily?
            int[] offsets = result.lineSeparatorPositions;
            int likelyOffset = 0;
            if (line > 0 && line < offsets.length) {
                //1st char of given line is next char after previous end of line
                likelyOffset = offsets[line-1];//FIXME may be need -2
            }
            sl.setOffset(likelyOffset);
        }
        return sl;
	}
    
    public void tidy() {
    	  result=null;
    }

	public void removeUnnecessaryProblems(Member member, int problemLineNumber) {
		if (result == null) return; 
		IProblem[] probs = result.getProblems();
		if (probs!=null) {
			for (int i = 0; i < probs.length; i++) {
				IProblem problem = probs[i];
				if (problem == null) continue;
				if (problem.getID() == IProblem.UnusedMethodDeclaredThrownException 
						|| problem.getID() == IProblem.UnusedConstructorDeclaredThrownException) {
					if (problem.getSourceLineNumber() == problemLineNumber) {
						UnusedDeclaredThrownExceptionFilter filter = 
							new UnusedDeclaredThrownExceptionFilter(problem);
						result.removeProblems(filter);	
					}
				}
			}
		}
	}

	private class UnusedDeclaredThrownExceptionFilter implements ProblemsForRemovalFilter {	
		private IProblem problemToRemove;

		public UnusedDeclaredThrownExceptionFilter(IProblem p) {
			problemToRemove = p;
		}

		public boolean accept(IProblem p) {
			if (p.equals(problemToRemove)) {
				return true;
			}
			return false;
		}

	}
}