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package com.sun.source.util;

import com.sun.source.tree.*;

/**
 * Provides methods to obtain the position of a Tree within a CompilationUnit.
 * A position is defined as a simple character offset from the start of a
 * CompilationUnit where the first character is at offset 0.
 *
 * @author Peter von der Ahé
 * @since 1.6
 */
public interface SourcePositions {

    /**
     * Returns the starting position of tree within file.  If tree is not found within
     * file, or if the starting position is not available,
     * returns {@link javax.tools.Diagnostic#NOPOS}.
     * The returned position must be at the start of the yield of this tree, that
     * is for any sub-tree of this tree, the following must hold:
     *
     * 

* {@code getStartPosition(file, tree) <= getStartPosition(file, subtree)} or
* {@code getStartPosition(file, tree) == NOPOS} or
* {@code getStartPosition(file, subtree) == NOPOS} *

* * @param file CompilationUnit in which to find tree * @param tree tree for which a position is sought * @return the start position of tree */ long getStartPosition(CompilationUnitTree file, Tree tree); /** * Returns the ending position of tree within file. If tree is not found within * file, or if the ending position is not available, * returns {@link javax.tools.Diagnostic#NOPOS}. * The returned position must be at the end of the yield of this tree, * that is for any sub-tree of this tree, the following must hold: * *

* {@code getEndPosition(file, tree) >= getEndPosition(file, subtree)} or
* {@code getEndPosition(file, tree) == NOPOS} or
* {@code getEndPosition(file, subtree) == NOPOS} *

* * In addition, the following must hold: * *

* {@code getStartPosition(file, tree) <= getEndPosition(file, tree)} or
* {@code getStartPosition(file, tree) == NOPOS} or
* {@code getEndPosition(file, tree) == NOPOS} *

* * @param file CompilationUnit in which to find tree * @param tree tree for which a position is sought * @return the end position of tree */ long getEndPosition(CompilationUnitTree file, Tree tree); }




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