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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
/**
 * 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, return 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: 
 tree.getStartPosition() <= subtree.getStartPosition() or 
 tree.getStartPosition() == NOPOS or 
 subtree.getStartPosition() == NOPOS 


Params:
  • file – CompilationUnit in which to find tree.
  • tree – tree for which a position is sought.
Returns:the start position of tree.
/**
     * Returns the starting position of tree within file.  If tree is not found within
     * file, or if the starting position is not available,
     * return {@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:
     *
     * <p>
     * {@code tree.getStartPosition() <= subtree.getStartPosition()} or <br>
     * {@code tree.getStartPosition() == NOPOS} or <br>
     * {@code subtree.getStartPosition() == NOPOS}
     * </p>
     *
     * @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, return 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: 
 tree.getEndPosition() >= subtree.getEndPosition() or 
 tree.getEndPosition() == NOPOS or 
 subtree.getEndPosition() == NOPOS 

In addition, the following must hold:

 tree.getStartPosition() <= tree.getEndPosition() or 
 tree.getStartPosition() == NOPOS or 
 tree.getEndPosition() == NOPOS 


Params:
  • file – CompilationUnit in which to find tree.
  • tree – tree for which a position is sought.
Returns:the end position of tree.
/**
     * Returns the ending position of tree within file.  If tree is not found within
     * file, or if the ending position is not available,
     * return {@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:
     *
     * <p>
     * {@code tree.getEndPosition() >= subtree.getEndPosition()} or <br>
     * {@code tree.getEndPosition() == NOPOS} or <br>
     * {@code subtree.getEndPosition() == NOPOS}
     * </p>
     *
     * In addition, the following must hold:
     *
     * <p>
     * {@code tree.getStartPosition() <= tree.getEndPosition()}  or <br>
     * {@code tree.getStartPosition() == NOPOS} or <br>
     * {@code tree.getEndPosition() == NOPOS}
     * </p>
     *
     * @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);

}