com.itextpdf.kernel.xmp.XMPUtils Maven / Gradle / Ivy
// =================================================================================================
// ADOBE SYSTEMS INCORPORATED
// Copyright 2006 Adobe Systems Incorporated
// All Rights Reserved
//
// NOTICE: Adobe permits you to use, modify, and distribute this file in accordance with the terms
// of the Adobe license agreement accompanying it.
// =================================================================================================
package com.itextpdf.kernel.xmp;
import com.itextpdf.kernel.xmp.impl.Base64;
import com.itextpdf.kernel.xmp.impl.ISO8601Converter;
import com.itextpdf.kernel.xmp.impl.XMPUtilsImpl;
import com.itextpdf.kernel.xmp.options.PropertyOptions;
/**
* Utility methods for XMP. I included only those that are different from the
* Java default conversion utilities.
*
* @since 21.02.2006
*/
public final class XMPUtils
{
/** Private constructor */
private XMPUtils()
{
// EMPTY
}
/**
* Create a single edit string from an array of strings.
*
* @param xmp
* The XMP object containing the array to be catenated.
* @param schemaNS
* The schema namespace URI for the array. Must not be null or
* the empty string.
* @param arrayName
* The name of the array. May be a general path expression, must
* not be null or the empty string. Each item in the array must
* be a simple string value.
* @param separator
* The string to be used to separate the items in the catenated
* string. Defaults to "; ", ASCII semicolon and space
* (U+003B, U+0020).
* @param quotes
* The characters to be used as quotes around array items that
* contain a separator. Defaults to '"'
* @param allowCommas
* Option flag to control the catenation.
* @return Returns the string containing the catenated array items.
* @throws XMPException Forwards the Exceptions from the metadata processing
*/
public static String catenateArrayItems(XMPMeta xmp, String schemaNS, String arrayName,
String separator, String quotes, boolean allowCommas) throws XMPException
{
return XMPUtilsImpl
.catenateArrayItems(xmp, schemaNS, arrayName, separator, quotes, allowCommas);
}
/**
* Separate a single edit string into an array of strings.
*
* @param xmp
* The XMP object containing the array to be updated.
* @param schemaNS
* The schema namespace URI for the array. Must not be null or
* the empty string.
* @param arrayName
* The name of the array. May be a general path expression, must
* not be null or the empty string. Each item in the array must
* be a simple string value.
* @param catedStr
* The string to be separated into the array items.
* @param arrayOptions Option flags to control the separation.
* @param preserveCommas Flag if commas shall be preserved
* @throws XMPException Forwards the Exceptions from the metadata processing
*/
public static void separateArrayItems(XMPMeta xmp, String schemaNS, String arrayName,
String catedStr, PropertyOptions arrayOptions, boolean preserveCommas)
throws XMPException
{
XMPUtilsImpl.separateArrayItems(xmp, schemaNS, arrayName, catedStr, arrayOptions,
preserveCommas);
}
/**
* Remove multiple properties from an XMP object.
*
* RemoveProperties was created to support the File Info dialog's Delete
* button, and has been been generalized somewhat from those specific needs.
* It operates in one of three main modes depending on the schemaNS and
* propName parameters:
*
*
* - Non-empty
schemaNS and propName - The named property is
* removed if it is an external property, or if the
* flag doAllProperties option is true. It does not matter whether the
* named property is an actual property or an alias.
*
* - Non-empty
schemaNS and empty propName - The all external
* properties in the named schema are removed. Internal properties are also
* removed if the flag doAllProperties option is set. In addition,
* aliases from the named schema will be removed if the flag includeAliases
* option is set.
*
* - Empty
schemaNS and empty propName - All external properties in
* all schema are removed. Internal properties are also removed if the
* flag doAllProperties option is passed. Aliases are implicitly handled
* because the associated actuals are internal if the alias is.
*
*
* It is an error to pass an empty schemaNS and non-empty propName.
*
* @param xmp
* The XMP object containing the properties to be removed.
*
* @param schemaNS
* Optional schema namespace URI for the properties to be
* removed.
*
* @param propName
* Optional path expression for the property to be removed.
*
* @param doAllProperties Option flag to control the deletion: do internal properties in
* addition to external properties.
*
* @param includeAliases Option flag to control the deletion:
* Include aliases in the "named schema" case above.
* Note: Currently not supported.
* @throws XMPException Forwards the Exceptions from the metadata processing
*/
public static void removeProperties(XMPMeta xmp, String schemaNS, String propName,
boolean doAllProperties, boolean includeAliases) throws XMPException
{
XMPUtilsImpl.removeProperties(xmp, schemaNS, propName, doAllProperties, includeAliases);
}
/**
* Alias without the new option deleteEmptyValues.
* @param source The source XMP object.
* @param dest The destination XMP object.
* @param doAllProperties Do internal properties in addition to external properties.
* @param replaceOldValues Replace the values of existing properties.
* @throws XMPException Forwards the Exceptions from the metadata processing
*/
public static void appendProperties(XMPMeta source, XMPMeta dest, boolean doAllProperties,
boolean replaceOldValues) throws XMPException
{
appendProperties(source, dest, doAllProperties, replaceOldValues, false);
}
/**
* Append properties from one XMP object to another.
*
* XMPUtils#appendProperties was created to support the File Info dialog's Append button, and
* has been been generalized somewhat from those specific needs. It appends information from one
* XMP object (source) to another (dest). The default operation is to append only external
* properties that do not already exist in the destination. The flag
* doAllProperties can be used to operate on all properties, external and internal.
* The flag replaceOldValues option can be used to replace the values
* of existing properties. The notion of external
* versus internal applies only to top level properties. The keep-or-replace-old notion applies
* within structs and arrays as described below.
*
* - If
replaceOldValues is true then the processing is restricted to the top
* level properties. The processed properties from the source (according to
* doAllProperties) are propagated to the destination,
* replacing any existing values.Properties in the destination that are not in the source
* are left alone.
*
* - If
replaceOldValues is not passed then the processing is more complicated.
* Top level properties are added to the destination if they do not already exist.
* If they do exist but differ in form (simple/struct/array) then the destination is left alone.
* If the forms match, simple properties are left unchanged while structs and arrays are merged.
*
* - If
deleteEmptyValues is passed then an empty value in the source XMP causes
* the corresponding destination XMP property to be deleted. The default is to treat empty
* values the same as non-empty values. An empty value is any of a simple empty string, an array
* with no items, or a struct with no fields. Qualifiers are ignored.
*
*
* The detailed behavior is defined by the following pseudo-code:
*
*
* appendProperties ( sourceXMP, destXMP, doAllProperties,
* replaceOldValues, deleteEmptyValues ):
* for all source schema (top level namespaces):
* for all top level properties in sourceSchema:
* if doAllProperties or prop is external:
* appendSubtree ( sourceNode, destSchema, replaceOldValues, deleteEmptyValues )
*
* appendSubtree ( sourceNode, destParent, replaceOldValues, deleteEmptyValues ):
* if deleteEmptyValues and source value is empty:
* delete the corresponding child from destParent
* else if sourceNode not in destParent (by name):
* copy sourceNode's subtree to destParent
* else if replaceOld:
* delete subtree from destParent
* copy sourceNode's subtree to destParent
* else:
* // Already exists in dest and not replacing, merge structs and arrays
* if sourceNode and destNode forms differ:
* return, leave the destNode alone
* else if form is a struct:
* for each field in sourceNode:
* AppendSubtree ( sourceNode.field, destNode, replaceOldValues )
* else if form is an alt-text array:
* copy new items by "xml:lang" value into the destination
* else if form is an array:
* copy new items by value into the destination, ignoring order and duplicates
*
*
*
* Note: appendProperties can be expensive if replaceOldValues is not passed and
* the XMP contains large arrays. The array item checking described above is n-squared.
* Each source item is checked to see if it already exists in the destination,
* without regard to order or duplicates.
*
Simple items are compared by value and "xml:lang" qualifier, other qualifiers are ignored.
* Structs are recursively compared by field names, without regard to field order. Arrays are
* compared by recursively comparing all items.
*
* @param source The source XMP object.
* @param dest The destination XMP object.
* @param doAllProperties Do internal properties in addition to external properties.
* @param replaceOldValues Replace the values of existing properties.
* @param deleteEmptyValues Delete destination values if source property is empty.
* @throws XMPException Forwards the Exceptions from the metadata processing
*/
public static void appendProperties(XMPMeta source, XMPMeta dest, boolean doAllProperties,
boolean replaceOldValues, boolean deleteEmptyValues) throws XMPException
{
XMPUtilsImpl.appendProperties(source, dest, doAllProperties, replaceOldValues,
deleteEmptyValues);
}
/**
* Convert from string to Boolean.
*
* @param value
* The string representation of the Boolean.
* @return The appropriate boolean value for the string. The checked values
* for true and false are:
*
* - {@link XMPConst#TRUESTR} and {@link XMPConst#FALSESTR}
*
- "t" and "f"
*
- "on" and "off"
*
- "yes" and "no"
*
- "value <> 0" and "value == 0"
*
* @throws XMPException If an empty string is passed.
*/
public static boolean convertToBoolean(String value) throws XMPException
{
if (value == null || value.length() == 0)
{
throw new XMPException("Empty convert-string", XMPError.BADVALUE);
}
value = value.toLowerCase();
try
{
// First try interpretation as Integer (anything not 0 is true)
return Integer.parseInt(value) != 0;
}
catch (NumberFormatException e)
{
return
"true".equals(value) ||
"t".equals(value) ||
"on".equals(value) ||
"yes".equals(value);
}
}
/**
* Convert from boolean to string.
*
* @param value
* a boolean value
* @return The XMP string representation of the boolean. The values used are
* given by the constnts {@link XMPConst#TRUESTR} and
* {@link XMPConst#FALSESTR}.
*/
public static String convertFromBoolean(boolean value)
{
return value ? XMPConst.TRUESTR : XMPConst.FALSESTR;
}
/**
* Converts a string value to an int.
*
* @param rawValue
* the string value
* @return Returns an int.
* @throws XMPException
* If the rawValue is null or empty or the
* conversion fails.
*/
public static int convertToInteger(String rawValue) throws XMPException
{
try
{
if (rawValue == null || rawValue.length() == 0)
{
throw new XMPException("Empty convert-string", XMPError.BADVALUE);
}
if (rawValue.startsWith("0x"))
{
return Integer.parseInt(rawValue.substring(2), 16);
}
else
{
return Integer.parseInt(rawValue);
}
}
catch (NumberFormatException e)
{
throw new XMPException("Invalid integer string", XMPError.BADVALUE);
}
}
/**
* Convert from int to string.
*
* @param value
* an int value
* @return The string representation of the int.
*/
public static String convertFromInteger(int value)
{
return String.valueOf(value);
}
/**
* Converts a string value to a long.
*
* @param rawValue
* the string value
* @return Returns a long.
* @throws XMPException
* If the rawValue is null or empty or the
* conversion fails.
*/
public static long convertToLong(String rawValue) throws XMPException
{
try
{
if (rawValue == null || rawValue.length() == 0)
{
throw new XMPException("Empty convert-string", XMPError.BADVALUE);
}
if (rawValue.startsWith("0x"))
{
return Long.parseLong(rawValue.substring(2), 16);
}
else
{
return Long.parseLong(rawValue);
}
}
catch (NumberFormatException e)
{
throw new XMPException("Invalid long string", XMPError.BADVALUE);
}
}
/**
* Convert from long to string.
*
* @param value
* a long value
* @return The string representation of the long.
*/
public static String convertFromLong(long value)
{
return String.valueOf(value);
}
/**
* Converts a string value to a double.
*
* @param rawValue
* the string value
* @return Returns a double.
* @throws XMPException
* If the rawValue is null or empty or the
* conversion fails.
*/
public static double convertToDouble(String rawValue) throws XMPException
{
try
{
if (rawValue == null || rawValue.length() == 0)
{
throw new XMPException("Empty convert-string", XMPError.BADVALUE);
}
else
{
return Double.parseDouble(rawValue);
}
}
catch (NumberFormatException e)
{
throw new XMPException("Invalid double string", XMPError.BADVALUE);
}
}
/**
* Convert from long to string.
*
* @param value
* a long value
* @return The string representation of the long.
*/
public static String convertFromDouble(double value)
{
return String.valueOf(value);
}
/**
* Converts a string value to an XMPDateTime.
*
* @param rawValue
* the string value
* @return Returns an XMPDateTime-object.
* @throws XMPException
* If the rawValue is null or empty or the
* conversion fails.
*/
public static XMPDateTime convertToDate(String rawValue) throws XMPException
{
if (rawValue == null || rawValue.length() == 0)
{
throw new XMPException("Empty convert-string", XMPError.BADVALUE);
}
else
{
return ISO8601Converter.parse(rawValue);
}
}
/**
* Convert from XMPDateTime to string.
*
* @param value
* an XMPDateTime
* @return The string representation of the long.
*/
public static String convertFromDate(XMPDateTime value)
{
return ISO8601Converter.render(value);
}
/**
* Convert from a byte array to a base64 encoded string.
*
* @param buffer
* the byte array to be converted
* @return Returns the base64 string.
*/
public static String encodeBase64(byte[] buffer)
{
return new String(Base64.encode(buffer));
}
/**
* Decode from Base64 encoded string to raw data.
*
* @param base64String
* a base64 encoded string
* @return Returns a byte array containg the decoded string.
* @throws XMPException Thrown if the given string is not property base64 encoded
*/
public static byte[] decodeBase64(String base64String) throws XMPException
{
try
{
return Base64.decode(base64String.getBytes());
}
catch (Throwable e)
{
throw new XMPException("Invalid base64 string", XMPError.BADVALUE, e);
}
}
}