org.xmlpull.v1.XmlSerializer Maven / Gradle / Ivy
package org.xmlpull.v1;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;
/**
* Define an interface to serialization of XML Infoset.
* This interface abstracts away if serialized XML is XML 1.0 compatible text or
* other formats of XML 1.0 serializations (such as binary XML for example with WBXML).
*
* PLEASE NOTE: This interface will be part of XmlPull 1.2 API.
* It is included as basis for discussion. It may change in any way.
*
*
Exceptions that may be thrown are: IOException or runtime exception
* (more runtime exceptions can be thrown but are not declared and as such
* have no semantics defined for this interface):
*
* - IllegalArgumentException - for almost all methods to signal that
* argument is illegal
*
- IllegalStateException - to signal that call has good arguments but
* is not expected here (violation of contract) and for features/properties
* when requesting setting unimplemented feature/property
* (UnsupportedOperationException would be better but it is not in MIDP)
*
*
* NOTE: writing CDSECT, ENTITY_REF, IGNORABLE_WHITESPACE,
* PROCESSING_INSTRUCTION, COMMENT, and DOCDECL in some implementations
* may not be supported (for example when serializing to WBXML).
* In such case IllegalStateException will be thrown and it is recommended
* to use an optional feature to signal that implementation is not
* supporting this kind of output.
*/
public interface XmlSerializer {
/**
* Set feature identified by name (recommended to be URI for uniqueness).
* Some well known optional features are defined in
*
* http://www.xmlpull.org/v1/doc/features.html.
*
* If feature is not recognized or can not be set
* then IllegalStateException MUST be thrown.
*
* @exception IllegalStateException If the feature is not supported or can not be set
*/
void setFeature(String name,
boolean state)
throws IllegalArgumentException, IllegalStateException;
/**
* Return the current value of the feature with given name.
*
NOTE: unknown properties are always returned as null
*
* @param name The name of feature to be retrieved.
* @return The value of named feature.
* @exception IllegalArgumentException if feature string is null
*/
boolean getFeature(String name);
/**
* Set the value of a property.
* (the property name is recommended to be URI for uniqueness).
* Some well known optional properties are defined in
*
* http://www.xmlpull.org/v1/doc/properties.html.
*
* If property is not recognized or can not be set
* then IllegalStateException MUST be thrown.
*
* @exception IllegalStateException if the property is not supported or can not be set
*/
void setProperty(String name,
Object value)
throws IllegalArgumentException, IllegalStateException;
/**
* Look up the value of a property.
*
* The property name is any fully-qualified URI. I
*
NOTE: unknown properties are always returned as null
*
* @param name The name of property to be retrieved.
* @return The value of named property.
*/
Object getProperty(String name);
/**
* Set to use binary output stream with given encoding.
*/
void setOutput (OutputStream os, String encoding)
throws IOException, IllegalArgumentException, IllegalStateException;
/**
* Set the output to the given writer.
* WARNING no information about encoding is available!
*/
void setOutput (Writer writer)
throws IOException, IllegalArgumentException, IllegalStateException;
/**
* Write <?xml declaration with encoding (if encoding not null)
* and standalone flag (if standalone not null)
* This method can only be called just after setOutput.
*/
void startDocument (String encoding, Boolean standalone)
throws IOException, IllegalArgumentException, IllegalStateException;
/**
* Finish writing. All unclosed start tags will be closed and output
* will be flushed. After calling this method no more output can be
* serialized until next call to setOutput()
*/
void endDocument ()
throws IOException, IllegalArgumentException, IllegalStateException;
/**
* Binds the given prefix to the given namespace.
* This call is valid for the next element including child elements.
* The prefix and namespace MUST be always declared even if prefix
* is not used in element (startTag() or attribute()) - for XML 1.0
* it must result in declaring xmlns:prefix='namespace'
* (or xmlns:prefix="namespace" depending what character is used
* to quote attribute value).
*
*
NOTE: this method MUST be called directly before startTag()
* and if anything but startTag() or setPrefix() is called next there will be exception.
*
NOTE: prefixes "xml" and "xmlns" are already bound
* and can not be redefined see:
* Namespaces in XML Errata.
*
NOTE: to set default namespace use as prefix empty string.
*
* @param prefix must be not null (or IllegalArgumentException is thrown)
* @param namespace must be not null
*/
void setPrefix (String prefix, String namespace)
throws IOException, IllegalArgumentException, IllegalStateException;
/**
* Return namespace that corresponds to given prefix
* If there is no prefix bound to this namespace return null
* but if generatePrefix is false then return generated prefix.
*
*
NOTE: if the prefix is empty string "" and default namespace is bound
* to this prefix then empty string ("") is returned.
*
*
NOTE: prefixes "xml" and "xmlns" are already bound
* will have values as defined
* Namespaces in XML specification
*/
String getPrefix (String namespace, boolean generatePrefix)
throws IllegalArgumentException;
/**
* Returns the current depth of the element.
* Outside the root element, the depth is 0. The
* depth is incremented by 1 when startTag() is called.
* The depth is decremented after the call to endTag()
* event was observed.
*
*
* <!-- outside --> 0
* <root> 1
* sometext 1
* <foobar> 2
* </foobar> 2
* </root> 1
* <!-- outside --> 0
*
*/
int getDepth();
/**
* Returns the namespace URI of the current element as set by startTag().
*
* NOTE: that means in particular that:
* - if there was startTag("", ...) then getNamespace() returns ""
*
- if there was startTag(null, ...) then getNamespace() returns null
*
*
* @return namespace set by startTag() that is currently in scope
*/
String getNamespace ();
/**
* Returns the name of the current element as set by startTag().
* It can only be null before first call to startTag()
* or when last endTag() is called to close first startTag().
*
* @return namespace set by startTag() that is currently in scope
*/
String getName();
/**
* Writes a start tag with the given namespace and name.
* If there is no prefix defined for the given namespace,
* a prefix will be defined automatically.
* The explicit prefixes for namespaces can be established by calling setPrefix()
* immediately before this method.
* If namespace is null no namespace prefix is printed but just name.
* If namespace is empty string then serializer will make sure that
* default empty namespace is declared (in XML 1.0 xmlns='')
* or throw IllegalStateException if default namespace is already bound
* to non-empty string.
*/
XmlSerializer startTag (String namespace, String name)
throws IOException, IllegalArgumentException, IllegalStateException;
/**
* Write an attribute. Calls to attribute() MUST follow a call to
* startTag() immediately. If there is no prefix defined for the
* given namespace, a prefix will be defined automatically.
* If namespace is null or empty string
* no namespace prefix is printed but just name.
*/
XmlSerializer attribute (String namespace, String name, String value)
throws IOException, IllegalArgumentException, IllegalStateException;
/**
* Write end tag. Repetition of namespace and name is just for avoiding errors.
* Background: in kXML endTag had no arguments, and non matching tags were
* very difficult to find...
* If namespace is null no namespace prefix is printed but just name.
* If namespace is empty string then serializer will make sure that
* default empty namespace is declared (in XML 1.0 xmlns='').
*/
XmlSerializer endTag (String namespace, String name)
throws IOException, IllegalArgumentException, IllegalStateException;
// /**
// * Writes a start tag with the given namespace and name.
// *
If there is no prefix defined (prefix == null) for the given namespace,
// * a prefix will be defined automatically.
// *
If explicit prefixes is passed (prefix != null) then it will be used
// *and namespace declared if not already declared or
// * throw IllegalStateException the same prefix was already set on this
// * element (setPrefix()) and was bound to different namespace.
// *
If namespace is null then prefix must be null too or IllegalStateException is thrown.
// *
If namespace is null then no namespace prefix is printed but just name.
// *
If namespace is empty string then serializer will make sure that
// * default empty namespace is declared (in XML 1.0 xmlns='')
// * or throw IllegalStateException if default namespace is already bound
// * to non-empty string.
// */
// XmlSerializer startTag (String prefix, String namespace, String name)
// throws IOException, IllegalArgumentException, IllegalStateException;
//
// /**
// * Write an attribute. Calls to attribute() MUST follow a call to
// * startTag() immediately.
// *
If there is no prefix defined (prefix == null) for the given namespace,
// * a prefix will be defined automatically.
// *
If explicit prefixes is passed (prefix != null) then it will be used
// * and namespace declared if not already declared or
// * throw IllegalStateException the same prefix was already set on this
// * element (setPrefix()) and was bound to different namespace.
// *
If namespace is null then prefix must be null too or IllegalStateException is thrown.
// *
If namespace is null then no namespace prefix is printed but just name.
// *
If namespace is empty string then serializer will make sure that
// * default empty namespace is declared (in XML 1.0 xmlns='')
// * or throw IllegalStateException if default namespace is already bound
// * to non-empty string.
// */
// XmlSerializer attribute (String prefix, String namespace, String name, String value)
// throws IOException, IllegalArgumentException, IllegalStateException;
//
// /**
// * Write end tag. Repetition of namespace, prefix, and name is just for avoiding errors.
// *
If namespace or name arguments are different from corresponding startTag call
// * then IllegalArgumentException is thrown, if prefix argument is not null and is different
// * from corresponding starTag then IllegalArgumentException is thrown.
// *
If namespace is null then prefix must be null too or IllegalStateException is thrown.
// *
If namespace is null then no namespace prefix is printed but just name.
// *
If namespace is empty string then serializer will make sure that
// * default empty namespace is declared (in XML 1.0 xmlns='').
// *
Background: in kXML endTag had no arguments, and non matching tags were
// * very difficult to find...
// */
// ALEK: This is really optional as prefix in end tag MUST correspond to start tag but good for error checking
// XmlSerializer endTag (String prefix, String namespace, String name)
// throws IOException, IllegalArgumentException, IllegalStateException;
/**
* Writes text, where special XML chars are escaped automatically
*/
XmlSerializer text (String text)
throws IOException, IllegalArgumentException, IllegalStateException;
/**
* Writes text, where special XML chars are escaped automatically
*/
XmlSerializer text (char [] buf, int start, int len)
throws IOException, IllegalArgumentException, IllegalStateException;
void cdsect (String text)
throws IOException, IllegalArgumentException, IllegalStateException;
void entityRef (String text) throws IOException,
IllegalArgumentException, IllegalStateException;
void processingInstruction (String text)
throws IOException, IllegalArgumentException, IllegalStateException;
void comment (String text)
throws IOException, IllegalArgumentException, IllegalStateException;
void docdecl (String text)
throws IOException, IllegalArgumentException, IllegalStateException;
void ignorableWhitespace (String text)
throws IOException, IllegalArgumentException, IllegalStateException;
/**
* Write all pending output to the stream.
* If method startTag() or attribute() was called then start tag is closed (final >)
* before flush() is called on underlying output stream.
*
* NOTE: if there is need to close start tag
* (so no more attribute() calls are allowed) but without flushing output
* call method text() with empty string (text("")).
*
*/
void flush ()
throws IOException;
}