https://github.com/oracle/graal: GraalVM is an ecosystem for compiling and running applications written in multiple languages. GraalVM removes the isolation between programming languages and enables interoperability in a shared runtime. 
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package org.graalvm.polyglot;

import org.graalvm.polyglot.impl.AbstractPolyglotImpl.AbstractSourceSectionImpl;


Description of contiguous section of text within a Source of program code.; supports multiple modes of access to the text and its location. Two available source sections are considered equal if their sources, start and length are equal. Unavailable source sections are compared by identity. Source sections are designed to be used as keys in hash maps. 
Since:19.0
/**
 * Description of contiguous section of text within a {@link Source} of program code.; supports
 * multiple modes of access to the text and its location.
 *
 * Two available source sections are considered equal if their sources, start and length are equal.
 * {@link #isAvailable() Unavailable} source sections are compared by identity. Source sections are
 * designed to be used as keys in hash maps.
 *
 * @since 19.0
 */
public final class SourceSection {

    static volatile AbstractSourceSectionImpl IMPL;

    final Source source;
    final Object impl;

    SourceSection(Source source, Object impl) {
        this.source = source;
        this.impl = impl;
    }

    
Returns whether this is a special instance that signifies that source information is
available. Available source sections are never equal to unavailable source sections.
Unavailable source sections return the same indices and lengths as empty source sections
starting at character index 0.

Since:19.0
/**
     * Returns whether this is a special instance that signifies that source information is
     * available. Available source sections are never equal to unavailable source sections.
     * Unavailable source sections return the same indices and lengths as empty source sections
     * starting at character index <code>0</code>.
     *
     * @since 19.0
     */
    public boolean isAvailable() {
        return IMPL.isAvailable(impl);
    }

    
Returns true if this section has a line number information, false
otherwise. When true, getStartLine() and getEndLine() return valid line numbers, when false, getStartLine() and getEndLine() return 1.

Since:19.0
/**
     * Returns <code>true</code> if this section has a line number information, <code>false</code>
     * otherwise. When <code>true</code>, {@link #getStartLine()} and {@link #getEndLine()} return
     * valid line numbers, when <code>false</code>, {@link #getStartLine()} and
     * {@link #getEndLine()} return <code>1</code>.
     *
     * @since 19.0
     */
    public boolean hasLines() {
        return IMPL.hasLines(impl);
    }

    
Returns true if this section has a column number information, false
otherwise. When true, hasLines() is true as well, getStartColumn() and getEndColumn() return valid column numbers. When false, getStartColumn() and getEndColumn() return 1.

Since:19.0
/**
     * Returns <code>true</code> if this section has a column number information, <code>false</code>
     * otherwise. When <code>true</code>, {@link #hasLines()} is <code>true</code> as well,
     * {@link #getStartColumn()} and {@link #getEndColumn()} return valid column numbers. When
     * <code>false</code>, {@link #getStartColumn()} and {@link #getEndColumn()} return
     * <code>1</code>.
     *
     * @since 19.0
     */
    public boolean hasColumns() {
        return IMPL.hasColumns(impl);
    }

    
Returns true if this section has a character index information,
false otherwise. When true, getCharIndex(), getCharEndIndex() and getCharLength() return valid character indices, when false, getCharIndex(), getCharEndIndex() and getCharLength() return 0.

Since:19.0
/**
     * Returns <code>true</code> if this section has a character index information,
     * <code>false</code> otherwise. When <code>true</code>, {@link #getCharIndex()},
     * {@link #getCharEndIndex()} and {@link #getCharLength()} return valid character indices, when
     * <code>false</code>, {@link #getCharIndex()}, {@link #getCharEndIndex()} and
     * {@link #getCharLength()} return <code>0</code>.
     *
     * @since 19.0
     */
    public boolean hasCharIndex() {
        return IMPL.hasCharIndex(impl);
    }

    
Representation of the source program that contains this section.

Returns:the source object.
Since:19.0
/**
     * Representation of the source program that contains this section.
     *
     * @return the source object.
     * @since 19.0
     */
    public Source getSource() {
        return source;
    }

    
Returns 1-based line number of the first character in this section (inclusive). Returns
1 for out of bounds or unavailable source sections, or source sections not having lines. 
See Also:
Returns:the starting line number.
Since:19.0
/**
     * Returns 1-based line number of the first character in this section (inclusive). Returns
     * <code>1</code> for out of bounds or {@link #isAvailable() unavailable} source sections, or
     * source sections not {@link #hasLines() having lines}.
     *
     * @return the starting line number.
     * @see #hasLines()
     * @since 19.0
     */
    public int getStartLine() {
        return IMPL.getStartLine(impl);
    }

    
Returns the 1-based column number of the first character in this section (inclusive). Returns
1 for out of bounds or unavailable source sections, or source sections not having columns. 
See Also:
Returns:the starting column number.
Since:19.0
/**
     * Returns the 1-based column number of the first character in this section (inclusive). Returns
     * <code>1</code> for out of bounds or {@link #isAvailable() unavailable} source sections, or
     * source sections not {@link #hasColumns() having columns}.
     *
     * @return the starting column number.
     * @see #hasColumns()
     * @since 19.0
     */
    public int getStartColumn() {
        return IMPL.getStartColumn(impl);
    }

    
Returns 1-based line number of the last character in this section (inclusive). Returns
1 for out of bounds or unavailable source sections, or source sections not having lines. 
See Also:
Returns:the starting line number.
Since:19.0
/**
     * Returns 1-based line number of the last character in this section (inclusive). Returns
     * <code>1</code> for out of bounds or {@link #isAvailable() unavailable} source sections, or
     * source sections not {@link #hasLines() having lines}.
     *
     * @return the starting line number.
     * @see #hasLines()
     * @since 19.0
     */
    public int getEndLine() {
        return IMPL.getEndLine(impl);
    }

    
Returns the 1-based column number of the last character in this section (inclusive). Returns
1 for out of bounds or unavailable source sections, or source sections not having columns. 
See Also:
Returns:the starting column number.
Since:19.0
/**
     * Returns the 1-based column number of the last character in this section (inclusive). Returns
     * <code>1</code> for out of bounds or {@link #isAvailable() unavailable} source sections, or
     * source sections not {@link #hasColumns() having columns}.
     *
     * @return the starting column number.
     * @see #hasColumns()
     * @since 19.0
     */
    public int getEndColumn() {
        return IMPL.getEndColumn(impl);
    }

    
Returns the 0-based index of the first character in this section. Returns 0 for unavailable source sections, or sections not 
having character index. The returned index might be out of bounds of the source code if assertions (-ea) are not enabled. 
See Also:
Returns:the starting character index.
Since:19.0
/**
     * Returns the 0-based index of the first character in this section. Returns <code>0</code> for
     * {@link #isAvailable() unavailable} source sections, or sections not {@link #hasCharIndex()
     * having character index}. The returned index might be out of bounds of the source code if
     * assertions (-ea) are not enabled.
     *
     * @return the starting character index.
     * @see #hasCharIndex()
     * @since 19.0
     */
    public int getCharIndex() {
        return IMPL.getCharIndex(impl);
    }

    
Returns the length of this section in characters. Returns 0 for unavailable source sections, or sections not 
having character index. The returned length might be out of bounds of the source code if assertions (-ea) are not enabled. 
See Also:
Returns:the number of characters in the section.
Since:19.0
/**
     * Returns the length of this section in characters. Returns <code>0</code> for
     * {@link #isAvailable() unavailable} source sections, or sections not {@link #hasCharIndex()
     * having character index}. The returned length might be out of bounds of the source code if
     * assertions (-ea) are not enabled.
     *
     * @return the number of characters in the section.
     * @see #hasCharIndex()
     * @since 19.0
     */
    public int getCharLength() {
        return IMPL.getCharLength(impl);
    }

    
Returns the index of the text position immediately following the last character in the
section. Returns 0 for unavailable source sections, or sections not having character index. The returned index might be out of bounds of the source code if assertions (-ea) are not enabled. 
See Also:
Returns:the end position of the section.
Since:19.0
/**
     * Returns the index of the text position immediately following the last character in the
     * section. Returns <code>0</code> for {@link #isAvailable() unavailable} source sections, or
     * sections not {@link #hasCharIndex() having character index}. The returned index might be out
     * of bounds of the source code if assertions (-ea) are not enabled.
     *
     * @return the end position of the section.
     * @see #hasCharIndex()
     * @since 19.0
     */
    public int getCharEndIndex() {
        return IMPL.getCharEndIndex(impl);
    }

    
Since:19.0
Deprecated:use getCharacters() instead.
/**
     * @since 19.0
     * @deprecated use {@link #getCharacters()} instead.
     */
    @Deprecated
    public CharSequence getCode() {
        return IMPL.getCode(impl);
    }

    
Returns the source code fragment described by this section. Returns an empty string for out of bounds or unavailable source sections. 
Returns:the code as a string.
Since:19.0
/**
     * Returns the source code fragment described by this section. Returns an empty string for out
     * of bounds or {@link #isAvailable() unavailable} source sections.
     *
     * @return the code as a string.
     * @since 19.0
     */
    public CharSequence getCharacters() {
        return IMPL.getCode(impl);
    }

    
Returns an implementation-defined string representation of this source section to be used for
debugging purposes only.

See Also:
  • getCharacters()
Since:19.0
/**
     * Returns an implementation-defined string representation of this source section to be used for
     * debugging purposes only.
     *
     * @see #getCharacters()
     * @since 19.0
     */
    @Override
    public String toString() {
        return IMPL.toString(impl);
    }

    
Since:19.0 or earlier
/** @since 19.0 or earlier */
    @Override
    public int hashCode() {
        return IMPL.hashCode(impl);
    }

    
Since:19.0 or earlier
/** @since 19.0 or earlier */
    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        Object otherImpl = obj;
        if (otherImpl instanceof SourceSection) {
            otherImpl = ((SourceSection) obj).impl;
        }
        return IMPL.equals(impl, otherImpl);
    }

}