JavaPropsSchema.java
package com.fasterxml.jackson.dataformat.javaprop;
import com.fasterxml.jackson.core.FormatSchema;
import com.fasterxml.jackson.dataformat.javaprop.util.JPropPathSplitter;
import com.fasterxml.jackson.dataformat.javaprop.util.Markers;
/**
* Simple {@link FormatSchema} sub-type that defines details of things like:
*<ul>
* <li>How are "flat" property names mapped to hierarchic POJO types, using
* separator-based naming convention.
* </li>
* <li>What indentation (if any) is used before key values, and between key/value
* </li>
* <li>If and how are Array values inferred from property names
* </li>
*</ul>
*/
public class JavaPropsSchema
implements FormatSchema,
java.io.Serializable
{
private static final long serialVersionUID = 1L; // 2.5
protected final static Markers DEFAULT_INDEX_MARKER = Markers.create("[", "]");
protected final static JavaPropsSchema EMPTY = new JavaPropsSchema();
/**
* Since splitter instances are slightly costly to build in some cases,
* we will lazily instantiate and cache them.
*/
protected transient JPropPathSplitter _splitter;
/*
/**********************************************************************
/* Simple numeric properties
/**********************************************************************
*/
/**
* Specifies index number used when writing the first array entry (which
* in Java has index of 0). After this initial value, additional elements
* will have consecutive values, incremented by 1.
* Note that this setting has no effect on reading: input indexes are only
* used for sorting values, and their exact values have no meaning.
*<p>
* Default value is 1.
*/
protected int _firstArrayOffset = 1;
/*
/**********************************************************************
/* Formatting constants for input and output
/**********************************************************************
*/
/**
* Default path separator to use for hierarchic paths, if any; empty
* String may be used to indicate that no hierarchy should be inferred
* using a simple separator (although index markers may still be used,
* if defined).
*/
protected String _pathSeparator = ".";
/**
* Default escape character to use for single character path separators
* , enabling the pathSeparator to be included in a segment.
* Note that this is only used if the path separator is a single character.
*
* The default value is NULL ('\0') which effectively disables escape processing.
*
* The escape character is only used for escaping either the pathSeparator character
* or a sequence of escape characters immediately prior to the pathSeparator.
* i.e., if the pathSeparator is "." and the escape char is '#' then "a#.b"
* produces a segment called "a.b", but "a##.b" produces a segment called "a#"
* with a child called "b" and "a###.b" produces a segment called "a#.b".
* Finally, "a#b" produces a segment called "a#b" - the escape processing is only used
* immediately prior to the path separator.
*
* Any escape character may be used.
* Backslash ('\\') is the most obvious candidate but be aware that the JDK Properties
* loader has its own rules for escape processing (documented in the Javadoc for
* <a href="https://docs.oracle.com/en/java/javase/18/docs/api/java.base/java/util/Properties.html#load(java.io.Reader)">Properties.load</a>
* ) that will remove ALL duplicated backslash characters (and also carry out
* other escape handling) before the JavaPropsMapper gets to see them.
*
* @since 2.14
*/
protected char _pathSeparatorEscapeChar = '\0';
/**
* Default start marker for index access, if any; empty String may be used
* to indicate no marker-based index detection should be made.
*<p>
* Default value of "[" is usually combined with end marker of "]" to allow
* C/Java-style bracket notation, like "settings.path[1]".
*/
protected Markers _indexMarker = DEFAULT_INDEX_MARKER;
/*
/**********************************************************************
/* Formatting constants for input(-only)
/**********************************************************************
*/
/**
* Whether 'simple' index-notation is supported for path segments or not:
* simple meaning that if a path segment is a textual representation of
* a non-negative integer value with length of 9 or less (that is, up to
* but no including one billion), it will be considered index, not property
* name.
*<p>
* Note that this settings does NOT control whether "start/end marker" indicated
* indexes are enabled or not; those depend on {@link #_indexMarker}.
*<p>
* Default value is <code>true</code>, "plain" index segments are
* supported.
*/
protected boolean _parseSimpleIndexes = true;
/*
/**********************************************************************
/* Formatting constants for output(-only)
/**********************************************************************
*/
/**
* Whether array-element paths are written using start/end markers
* (see {@link #_indexMarker} or
* "simple" index number: if set to <code>true</code> AND markers
* are specified as non-empty Strings, will use sequence of
*<pre>
* startMarker index endMarker
*</pre>
* to include index in path; otherwise will simply use textual representation
* of the index number as path segment, prefixed by path separator as necessary.
*/
protected boolean _writeIndexUsingMarkers;
/**
* String prepended before key value, as possible indentation
*/
protected String _lineIndentation = "";
/**
* String added between key and value; needs to include the "equals character"
* (either '=' or ':', both allowed by Java Properties specification), may
* also include white before and/or after "equals character".
* Default value is a single '=' character with no white spaces around
*/
protected String _keyValueSeparator = "=";
/**
* String added after value, including at least one linefeed.
* Default value is the 'Unix linefeed'.
*/
protected String _lineEnding = "\n";
/**
* Optional header to prepend before any other output: typically a
* comment section or so. Note that contents here are
* <b>NOT modified in any way</b>, meaning that any comment indicators
* (leading '#' or '!') and linefeeds MUST be specified by caller.
*/
protected String _header = "";
/**
* Optional prefix to strip and append to key names.
* Useful when subset of properties need to be processed.
*
* @since 2.10
*/
protected String _prefix;
/*
/**********************************************************************
/* Construction, factories, mutant factories
/**********************************************************************
*/
public JavaPropsSchema() { }
public JavaPropsSchema(JavaPropsSchema base) {
_firstArrayOffset = base._firstArrayOffset;
_pathSeparator = base._pathSeparator;
_pathSeparatorEscapeChar = base._pathSeparatorEscapeChar;
_indexMarker = base._indexMarker;
_parseSimpleIndexes = base._parseSimpleIndexes;
_writeIndexUsingMarkers = base._writeIndexUsingMarkers;
_lineIndentation = base._lineIndentation;
_keyValueSeparator = base._keyValueSeparator;
_lineEnding = base._lineEnding;
_header = base._header;
_prefix = base._prefix;
}
/**
* Accessor for getting a {@link JPropPathSplitter} instance that does
* splitting according to the settings of this instance.
*<p>
* Note that instance is constructed lazily as needed, but reused afterwards
* for this instance (and for these specific settings).
*/
public JPropPathSplitter pathSplitter() {
JPropPathSplitter splitter = _splitter;
if (splitter == null) {
_splitter = splitter = JPropPathSplitter.create(this);
}
return splitter;
}
public JavaPropsSchema withFirstArrayOffset(int v) {
if (v == _firstArrayOffset) {
return this;
}
JavaPropsSchema s = new JavaPropsSchema(this);
s._firstArrayOffset = v;
return s;
}
/**
* Mutant factory method for constructing a new instance with
* specified path separator; default being comma (".").
* Note that setting separator to `null` or empty String will
* basically disable handling of nesting, similar to
* calling {@link #withoutPathSeparator}.
*/
public JavaPropsSchema withPathSeparator(String v) {
if (v == null) {
v = "";
}
if (_equals(v, _pathSeparator)) {
return this;
}
JavaPropsSchema s = new JavaPropsSchema(this);
s._pathSeparator = v;
return s;
}
/**
* Mutant factory method for constructing a new instance with
* a different escape character to use for single character path separators
* , enabling the pathSeparator to be included in a segment.
* Note that this is only used if the path separator is a single character.
*
* The default value is NULL ('\0') which effectively disables escape processing.
*
* The escape character is only used for escaping either the pathSeparator character
* or a sequence of escape characters immediately prior to the pathSeparator.
* i.e., if the pathSeparator is "." and the escape char is '#' then "a#.b"
* produces a segment called "a.b", but "a##.b" produces a segment called "a#"
* with a child called "b" and "a###.b" produces a segment called "a#.b".
* Finally, "a#b" produces a segment called "a#b" - the escape processing is only used
* immediately prior to the path separator.
*
* Any escape character may be used.
* Backslash ('\\') is the most obvious candidate but be aware that the JDK Properties
* loader has its own rules for escape processing (documented in the Javadoc for
* <a href="https://docs.oracle.com/en/java/javase/18/docs/api/java.base/java/util/Properties.html#load(java.io.Reader)">Properties.load</a>
* ) that will remove ALL duplicated backslash characters (and also carry out
* other escape handling) before the JavaPropsMapper gets to see them.
*
* @since 2.14
*/
public JavaPropsSchema withPathSeparatorEscapeChar(char v) {
if (_equals(v, _pathSeparator)) {
return this;
}
JavaPropsSchema s = new JavaPropsSchema(this);
s._pathSeparatorEscapeChar = v;
return s;
}
/**
* Mutant factory method for constructing a new instance that
* specifies that no "path splitting" is to be done: this is
* similar to default behavior of {@link java.util.Properties}
* in which keys are full Strings and there is no nesting of values.
*/
public JavaPropsSchema withoutPathSeparator() {
if ("".equals(_pathSeparator)) {
return this;
}
JavaPropsSchema s = new JavaPropsSchema(this);
s._pathSeparator = "";
return s;
}
public JavaPropsSchema withIndexMarker(Markers v) {
if (_equals(v, _indexMarker)) {
return this;
}
JavaPropsSchema s = new JavaPropsSchema(this);
s._indexMarker = v;
return s;
}
public JavaPropsSchema withoutIndexMarker() {
if (_indexMarker == null) {
return this;
}
JavaPropsSchema s = new JavaPropsSchema(this);
s._indexMarker = null;
return s;
}
public JavaPropsSchema withParseSimpleIndexes(boolean v) {
if (v == _parseSimpleIndexes) {
return this;
}
JavaPropsSchema s = new JavaPropsSchema(this);
s._parseSimpleIndexes = v;
return s;
}
public JavaPropsSchema withWriteIndexUsingMarkers(boolean v) {
if (v == _writeIndexUsingMarkers) {
return this;
}
JavaPropsSchema s = new JavaPropsSchema(this);
s._writeIndexUsingMarkers = v;
return s;
}
public JavaPropsSchema withLineIndentation(String v) {
if (_equals(v, _lineIndentation)) {
return this;
}
JavaPropsSchema s = new JavaPropsSchema(this);
s._lineIndentation = v;
return s;
}
/**
* @since 2.8
*/
public JavaPropsSchema withoutLineIndentation() {
return withLineIndentation("");
}
public JavaPropsSchema withKeyValueSeparator(String v) {
if (_equals(v, _keyValueSeparator)) {
return this;
}
JavaPropsSchema s = new JavaPropsSchema(this);
s._keyValueSeparator = v;
return s;
}
public JavaPropsSchema withLineEnding(String v) {
if (_equals(v, _lineEnding)) {
return this;
}
JavaPropsSchema s = new JavaPropsSchema(this);
s._lineEnding = v;
return s;
}
/**
* Mutant factory for constructing schema instance where specified
* prefix is prepended before logical path when generator writes output
* and removed by parser before binding back as properties.
*
* @since 2.10
*/
public JavaPropsSchema withPrefix(String v) {
if (_equals(v, _prefix)) {
return this;
}
JavaPropsSchema s = new JavaPropsSchema(this);
s._prefix = v;
return s;
}
/**
* Mutant factory for constructing schema instance where specified
* header section (piece of text written out right before actual
* properties entries) will be used.
* Note that caller must specify any and all linefeeds to use: generator
* will NOT modify header String contents in any way, and will not append
* a linefeed after contents (if any).
*/
public JavaPropsSchema withHeader(String v) {
if (_equals(v, _header)) {
return this;
}
JavaPropsSchema s = new JavaPropsSchema(this);
s._header = v;
return s;
}
/**
* Convenience method, functionally equivalent to:
*<pre>
* withHeader("")
*</pre>
* used to ensure that no header is prepended before actual property values
* are output.
*
* @since 2.8
*/
public JavaPropsSchema withoutHeader() {
return withHeader("");
}
/*
/**********************************************************************
/* Public API, FormatSchema
/**********************************************************************
*/
@Override
public String getSchemaType() {
return "JavaProps";
}
public static JavaPropsSchema emptySchema() {
return EMPTY;
}
/*
/**********************************************************************
/* Public API, extended, properties
/**********************************************************************
*/
public int firstArrayOffset() {
return _firstArrayOffset;
}
public String header() {
return _header;
}
public Markers indexMarker() {
return _indexMarker;
}
public String lineEnding() {
return _lineEnding;
}
public String lineIndentation() {
return _lineIndentation;
}
public String keyValueSeparator() {
return _keyValueSeparator;
}
public boolean parseSimpleIndexes() {
return _parseSimpleIndexes;
}
public String pathSeparator() {
return _pathSeparator;
}
/**
* @since 2.14
*/
public char pathSeparatorEscapeChar() {
return _pathSeparatorEscapeChar;
}
/**
* @since 2.10
*/
public String prefix() {
return _prefix;
}
public boolean writeIndexUsingMarkers() {
return _writeIndexUsingMarkers && (_indexMarker != null);
}
private <V> boolean _equals(V a, V b) {
if (a == null) {
return (b == null);
}
return (b != null) && a.equals(b);
}
}