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/*   Copyright 2004 The Apache Software Foundation
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.xmlbeans;

import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.util.Collection;
import java.util.Map;
import javax.xml.namespace.QName;

/**
 * Represents a position between two logical tokens in an XML document. 
 * 
 * The tokens themselves are not exposed as objects, but their type and properties
 * are discoverable through methods on the cursor.  In particular, the general
 * category of token is represented by a {@link XmlCursor.TokenType TokenType}.

* * You use an XmlCursor instance to navigate through and manipulate an XML * instance document. * Once you obtain an XML document, you can create a cursor to represent * a specific place in the XML. Because you can use a cursor with or * without a schema corresponding to the XML, cursors are an ideal * way to handle XML without a schema. You can create a new cursor by * calling the {@link XmlTokenSource#newCursor() newCursor} method * exposed by an object representing * the XML, whether it was parsed into a strong type compiled from * schema or an {@link XmlObject XmlObject} (as in the no-schema case).

* * With an XmlCursor, you can also:

* *
    *
  • Execute XQuery and XPath expressions against the XML with the * execQuery and selectPath methods.
  • * *
  • Edit and reshape the document by inserting, moving, copying, and removing * XML.
  • * *
  • Insert bookmarks that "stick" to the XML at the cursor's * position even if the cursor or XML moves.
  • *
  • Get and set values for containers (elements and whole documents), * attributes, processing instructions, and comments.
  • *
* * A cursor moves through XML by moving past tokens. A * token represents a category of XML markup, such as the start of an element, * its end, an attribute, comment, and so on. XmlCursor methods such as * toNextToken, toNextSibling, toParent, and so on move the cursor * among tokens. Each token's category is of a particular type, represented * by one of the nine types defined by the {@link XmlCursor.TokenType TokenType} class.

* * When you get a new cursor for a whole instance document, the cursor is * intially located before the STARTDOC token. This token, which has no analogy * in the XML specification, is present in this logical model of XML * so that you may distinguish between the document as a whole * and the content of the document. Terminating the document is an ENDDOC * token. This token is also not part of the XML specification. A cursor * located immediately before this token is at the very end of the document. * It is not possible to position the cursor after the ENDDOC token. * Thus, the STARTDOC and ENDDOC tokens are effectively "bookends" for the content of * the document.

* * For example, for the following XML, if you were the navigate a cursor * through the XML document using toNextToken(), the list of token types that * follows represents the token sequence you would encounter.

* *
 * <sample x='y'>
 *     <value>foo</value>
 * </sample>
 * 
* * STARTDOC
* START (sample)
* ATTR (x='y')
* TEXT ("\n ")
* START (value)
* TEXT ("foo")
* END (value)
* TEXT ("\n")
* END (sample)
* ENDDOC

* * When there are no more tokens available, hasNextToken() returns * false and toNextToken() returns the special token type NONE and does not move * the cursor. *

* * The {@link #currentTokenType() currentTokenType()} method * will return the type of the token that is immediately after the cursor. * You can also use a number of convenience methods that test for a particular * token type. These include the methods isStart(), * isStartdoc(), isText(), isAttr(), and so on. Each returns a boolean * value indicating whether the token that follows the cursor is the type * in question. *

* * A few other methods determine whether the token is of a kind that may include * multiple token types. The isAnyAttr() method, for example, returns true if * the token immediately following the cursor is any kind of attribute, * including those of the ATTR token type and xmlns attributes. *

* * Legitimate sequences of tokens for an XML document are described * by the following Backus-Naur Form (BNF):
* *
 * <doc> ::= STARTDOC <attributes> <content> ENDDOC
 * <element> ::= START <attributes> <content> END
 * <attributes> ::= ( ATTR | NAMESPACE ) *
 * <content> ::= ( COMMENT | PROCINST | TEXT | <element> ) *
 * 
* * Note that a legitimate sequence is STARTDOC ENDDOC, the result of * creating a brand new instance of an empty document. Also note that * attributes may only follow container tokens (STARTDOC or START) */ public interface XmlCursor extends XmlTokenSource { /** * An enumeration that identifies the type of an XML token. */ public static final class TokenType { public String toString ( ) { return _name; } /** * Returns one of the INT_ values defined in this class. */ public int intValue ( ) { return _value; } /** No token. See {@link #intValue}. */ public static final int INT_NONE = 0; /** The start-document token. See {@link #intValue}. */ public static final int INT_STARTDOC = 1; /** The end-document token. See {@link #intValue}. */ public static final int INT_ENDDOC = 2; /** The start-element token. See {@link #intValue}. */ public static final int INT_START = 3; /** The end-element token. See {@link #intValue}. */ public static final int INT_END = 4; /** The text token. See {@link #intValue}. */ public static final int INT_TEXT = 5; /** The attribute token. See {@link #intValue}. */ public static final int INT_ATTR = 6; /** The namespace declaration token. See {@link #intValue}. */ public static final int INT_NAMESPACE = 7; /** The comment token. See {@link #intValue}. */ public static final int INT_COMMENT = 8; /** The processing instruction token. See {@link #intValue}. */ public static final int INT_PROCINST = 9; /** True if no token. */ public boolean isNone ( ) { return this == NONE; } /** True if is start-document token. */ public boolean isStartdoc ( ) { return this == STARTDOC; } /** True if is end-document token. */ public boolean isEnddoc ( ) { return this == ENDDOC; } /** True if is start-element token. */ public boolean isStart ( ) { return this == START; } /** True if is end-element token. */ public boolean isEnd ( ) { return this == END; } /** True if is text token. */ public boolean isText ( ) { return this == TEXT; } /** True if is attribute token. */ public boolean isAttr ( ) { return this == ATTR; } /** True if is namespace declaration token. */ public boolean isNamespace ( ) { return this == NAMESPACE; } /** True if is comment token. */ public boolean isComment ( ) { return this == COMMENT; } /** True if is processing instruction token. */ public boolean isProcinst ( ) { return this == PROCINST; } /** True if is start-document or start-element token */ public boolean isContainer ( ) { return this == STARTDOC || this == START; } /** True if is end-document or end-element token */ public boolean isFinish ( ) { return this == ENDDOC || this == END; } /** True if is attribute or namespace declaration token */ public boolean isAnyAttr ( ) { return this == NAMESPACE || this == ATTR; } /** The singleton no-token type */ public static final TokenType NONE = new TokenType( "NONE", INT_NONE ); /** The singleton start-document token type */ public static final TokenType STARTDOC = new TokenType( "STARTDOC", INT_STARTDOC ); /** The singleton start-document token type */ public static final TokenType ENDDOC = new TokenType( "ENDDOC", INT_ENDDOC ); /** The singleton start-element token type */ public static final TokenType START = new TokenType( "START", INT_START ); /** The singleton end-element token type */ public static final TokenType END = new TokenType( "END", INT_END ); /** The singleton text token type */ public static final TokenType TEXT = new TokenType( "TEXT", INT_TEXT ); /** The singleton attribute token type */ public static final TokenType ATTR = new TokenType( "ATTR", INT_ATTR ); /** The singleton namespace declaration token type */ public static final TokenType NAMESPACE = new TokenType( "NAMESPACE", INT_NAMESPACE ); /** The singleton comment token type */ public static final TokenType COMMENT = new TokenType( "COMMENT", INT_COMMENT ); /** The singleton processing instruction token type */ public static final TokenType PROCINST = new TokenType( "PROCINST", INT_PROCINST ); private TokenType ( String name, int value ) { _name = name; _value = value; } private String _name; private int _value; } /** * Deallocates resources needed to manage the cursor, rendering this cursor * inoperable. Because cursors are managed by a mechanism which stores the * XML, simply letting a cursor go out of scope and having the garbage collector * attempt to reclaim it may not produce desirable performance.

* * So, explicitly disposing a cursor allows the underlying implementation * to release its responsibility of maintaining its position.

* * After a cursor has been disposed, it may not be used again. It can * throw IllegalStateException or NullPointerException if used after * disposal.

*/ void dispose ( ); /** * Moves this cursor to the same position as the moveTo cursor. if the * moveTo cursor is in a different document from this cursor, this cursor * will not be moved, and false returned. * * @param moveTo The cursor at the location to which this cursor * should be moved. * @return true if the cursor moved; otherwise, false. */ boolean toCursor ( XmlCursor moveTo ); /** * Saves the current location of this cursor on an internal stack of saved * positions (independent of selection). This location may be restored * later by calling the pop() method. */ void push ( ); /** * Restores the cursor location most recently saved with the push() method. * * @return true if there was a location to restore; otherwise, false. */ boolean pop ( ); /** * Executes the specified XPath expression against the XML that this * cursor is in. The cursor's position does not change. To navigate to the * selections, use {@link #hasNextSelection} and {@link #toNextSelection} (similar to * {@link java.util.Iterator}).

* * The root referred to by the expression should be given as * a dot. The following is an example path expression: *
     * cursor.selectPath("./purchase-order/line-item");
     * 
* * Note that this method does not support top-level XPath functions. * * @param path The path expression to execute. * @throws XmlRuntimeException If the query expression is invalid. */ void selectPath ( String path ); /** * Executes the specified XPath expression against the XML that this * cursor is in. The cursor's position does not change. To navigate to the * selections, use hasNextSelection and toNextSelection (similar to * java.util.Iterator).

* * The root referred to by the expression should be given as * a dot. The following is an example path expression: *
     * cursor.selectPath("./purchase-order/line-item");
     * 
* * Note that this method does not support top-level XPath functions. * * @param path The path expression to execute. * @param options Options for the query. For example, you can call * the {@link XmlOptions#setXqueryCurrentNodeVar(String) XmlOptions.setXqueryCurrentNodeVar(String)} * method to specify a particular name for the query expression * variable that indicates the context node. * @throws XmlRuntimeException If the query expression is invalid. */ void selectPath ( String path, XmlOptions options ); /** * Returns whether or not there is a next selection. * * @return true if there is a next selection; otherwise, false. */ boolean hasNextSelection ( ); /** * Moves this cursor to the next location in the selection, * if any. See the {@link #selectPath} and {@link #addToSelection} methods. * * @return true if the cursor moved; otherwise, false. */ boolean toNextSelection ( ); /** * Moves this cursor to the specified location in the selection. * If i is less than zero or greater than or equal to the selection * count, this method returns false. * * See also the selectPath() and addToSelection() methods. * * @param i The index of the desired location. * @return true if the cursor was moved; otherwise, false. */ boolean toSelection ( int i ); /** * Returns the count of the current selection. See also the selectPath() * and addToSelection() methods. * * You may experience better performance if you use the iteration * model using the toNextSelection method, rather than * the indexing model using the getSelectionCount and * toSelection methods. * * @return A number indicating the size of the current selection. */ int getSelectionCount ( ); /** * Appends the current location of the cursor to the selection. * See also the selectPath() method. You can use this as an * alternative to calling the selectPath method when you want * to define your own selection. */ void addToSelection ( ); /** * Clears this cursor's selection, but does not modify the document. */ void clearSelections ( ); /** * Moves this cursor to the same position as the bookmark. If the * bookmark is in a different document from this cursor or if the * bookmark is orphaned, this cursor * will not be moved, and false will be returned. * * @param bookmark The bookmark at the location to which this * cursor should be moved. * @return true if the cursor moved; otherwise, false. */ boolean toBookmark ( XmlBookmark bookmark ); /** * Moves this cursor to the location after its current position * where a bookmark with the given key exists. Returns false if no * such bookmark exists. * * @param key The key held by the next bookmark at the location to * which this cursor should be moved. * @return The next corresponding bookmark, if it exists; null if there * is no next bookmark with the specified key. */ XmlBookmark toNextBookmark ( Object key ); /** * Moves this cursor to the location before its current position * where a bookmark with the given key exists. Returns false if no * such bookmark exists. * * @param key The key held by the previous bookmark at the location to * which this cursor should be moved. * @return The previous corresponding bookmark, if it exists; null if * there is no previous bookmark with the specified key. */ XmlBookmark toPrevBookmark ( Object key ); /** * Returns the name of the current token. Names may be associated with * START, ATTR, NAMESPACE or PROCINST. Returns null if there is no * name associated with the current token. For START and ATTR, the * name returned identifies the name of the element or attribute. * For NAMESPACE, the local part of the name is the prefix, while * the URI is the namespace defined. For PROCINST, the local part * is the target and the uri is "". *

* In the following example, xmlObject represents * an XML instance whose root element is not preceded by any other XML. * This code prints the root element name (here, the local name, or * name without URI). *

     * XmlCursor cursor = xmlObject.newCursor();
     * cursor.toFirstContentToken();
     * String elementName = cursor.getName().getLocalPart();
     * System.out.println(elementName);
     * 
* * @return The name of the XML at this cursor's location; null if there * is no name. */ QName getName ( ); /** * Sets the name of the current token. This token can be START, NAMESPACE, * ATTR or PROCINST. * * @param name The new name for the current token. */ void setName ( QName name ); /** * Returns the namespace URI indicated by the given prefix. The current * context must be at a START or STARTDOC. Namespace prefix mappings * are queried for the mappings defined at the current container first, * then parents are queried. The prefix can be "" or null to indicate * a search for the default namespace. To conform with the * XML spec, the default namespace will return the no-namespace ("") * if it is not mapped.

* * Note that this queries the current state of the document. When the * document is persisted, the saving mechanism may synthesize namespaces * (ns1, ns2, and so on) for the purposes of persistence. These namepaces are * only present in the serialized form, and are not reflected back into * the document being saved. * * @param prefix The namespace prefix for the requested namespace. * @return The URI for corresponding to the specified prefix if it * exists; otherwise, null. */ String namespaceForPrefix ( String prefix ); /** * Returns a prefix that can be used to indicate a namespace URI. The * current context must be at a START or STARTDOC. If there is an * existing prefix that indicates the URI in the current context, that * prefix may be returned. Otherwise, a new prefix for the URI will be * defined by adding an xmlns attribute to the current container or a * parent container. * * Note that this queries the current state of the document. When the * document is persisted, the saving mechanism may synthesize namespaces * (ns1, ns2, and so on) for the purposes of persistence. These namepaces are * only present in the serialized form, and are not reflected back into * the document being saved. * * @param namespaceURI The namespace URI corresponding to the requested * prefix. * @return The prefix corresponding to the specified URI if it exists; * otherwise, a newly generated prefix. */ String prefixForNamespace ( String namespaceURI ); /** * Adds to the specified map, all the namespaces in scope at the container * where this cursor is positioned. This method is useful for * container tokens only. * * @param addToThis The Map to add the namespaces to. */ void getAllNamespaces ( Map addToThis ); /** * Returns the strongly-typed XmlObject at the current START, * STARTDOC, or ATTR.

* * The strongly-typed object can be cast to the strongly-typed * XBean interface corresponding to the XML Schema Type given * by result.getSchemaType().

* * If a more specific type cannot be determined, an XmlObject * whose schema type is anyType will be returned. * * @return The strongly-typed object at the cursor's current location; * null if the current location is not a START, STARTDOC, or ATTR. */ XmlObject getObject ( ); /** * Returns the type of the current token. By definition, the current * token is the token immediately to the right of the cursor. * If you're in the middle of text, before a character, you get TEXT. * You can't dive into the text of an ATTR, COMMENT or PROCINST.

* * As an alternative, it may be more convenient for you to use one of the * methods that test for a particular token type. These include the methods * isStart(), isStartdoc(), isText(), isAttr(), and so on. Each returns a boolean * value indicating whether the token that follows the cursor is the type * in question. *

* * @return The TokenType instance for the token at the cursor's current * location. */ TokenType currentTokenType ( ); /** * True if the current token is a STARTDOC token type, meaning * at the very root of the document. * * @return true if this token is a STARTDOC token type; * otherwise, false. */ boolean isStartdoc ( ); /** * True if this token is an ENDDOC token type, meaning * at the very end of the document. * * @return true if this token is an ENDDOC token type; * otherwise, false. */ boolean isEnddoc ( ); /** * True if this token is a START token type, meaning * just before an element's start. * * @return true if this token is a START token type; * otherwise, false. */ boolean isStart ( ); /** * True if this token is an END token type, meaning * just before an element's end. * * @return true if this token is an END token type; * otherwise, false. */ boolean isEnd ( ); /** * True if the this token is a TEXT token type, meaning * just before or inside text. * * @return true if this token is a TEXT token type; * otherwise, false. */ boolean isText ( ); /** * True if this token is an ATTR token type, meaning * just before an attribute. * * @return true if this token is an ATTR token type; * otherwise, false. */ boolean isAttr ( ); /** * True if this token is a NAMESPACE token type, meaning * just before a namespace declaration. * * @return true if this token is a NAMESPACE token type; * otherwise, false. */ boolean isNamespace ( ); /** * True if this token is a COMMENT token type, meaning * just before a comment. * * @return true if this token is a COMMENT token type; * otherwise, false. */ boolean isComment ( ); /** * True if this token is a PROCINST token type, meaning * just before a processing instruction. * * @return true if this token is a PROCINST token type; * otherwise, false. */ boolean isProcinst ( ); /** * True if this token is a container token. The STARTDOC and START * token types are containers. Containers, including documents and elements, * have the same content model. In other words, a document and an element * may have the same contents. For example, a document may contain attributes * or text, without any child elements. * * @return true if this token is a container token; otherwise, false. */ boolean isContainer ( ); /** * True if this token is a finish token. A finish token can be an ENDDOC * or END token type. * @return true if this token is a finish token; otherwise, false. */ boolean isFinish ( ); /** * True if this token is any attribute. This includes an ATTR token type and * the NAMESPACE token type attribute. * * @return true if the current cursor is at any attribute; otherwise, false. */ boolean isAnyAttr ( ); /** * Returns the type of the previous token. By definition, the previous * token is the token immediately to the left of the cursor.

* * If you're in the middle of text, after a character, you get TEXT. * * @return The TokenType instance for the token immediately before the * token at the cursor's current location. */ TokenType prevTokenType ( ); /** * True if there is a next token. When this is false, as when the cursor is * at the ENDDOC token, the toNextToken() method returns NONE and does not * move the cursor. * * @return true if there is a next token; otherwise, false. */ boolean hasNextToken ( ); /** * True if there is a previous token. When this is false, toPrevToken * returns NONE and does not move the cursor. * * @return true if there is a previous token; otherwise, false. */ boolean hasPrevToken ( ); /** * Moves the cursor to the next token. When there are no more tokens * available, hasNextToken returns false and toNextToken() returns * NONE and does not move the cursor. Returns the token type * of the token to the right of the cursor upon a successful move. * * @return The token type for the next token if the cursor was moved; * otherwise, NONE. */ TokenType toNextToken ( ); /** * Moves the cursor to the previous token. When there is no * previous token, returns NONE, otherwise returns the token * to the left of the new position of the cursor. * * @return The token type for the previous token if the cursor was moved; * otherwise, NONE. */ TokenType toPrevToken ( ); /** * Moves the cursor to the first token in the content of the current * START or STARTDOC. That is, the first token after all ATTR and NAMESPACE * tokens associated with this START.

* * If the current token is not a START or STARTDOC, the cursor is not * moved and NONE is returned. If the current START or STARTDOC * has no content, the cursor is moved to the END or ENDDOC token.

* * @return The new current token type. */ TokenType toFirstContentToken ( ); /** * Moves the cursor to the END or ENDDOC token corresponding to the * current START or STARTDOC, and returns END or ENDDOC.

* * If the current token is not a START or STARTDOC, the cursor is not * moved and NONE is returned. * * @return The new current token type. */ TokenType toEndToken ( ); /** * Moves the cursor forward by the specified number of characters, and * stops at the next non-TEXT token. Returns the number of characters * actually moved across, which is guaranteed to be less than or equal to * maxCharacterCount. If there is no further text, or if * there is no text at all, returns zero.

* * Note this does not dive into attribute values, comment contents, * processing instruction contents, etc., but only content text.

* * You can pass maxCharacterCount < 0 to move over all the text to the * right. This has the same effect as toNextToken, but returns the amount * of text moved over. * * @param maxCharacterCount The maximum number of characters by which * the cursor should be moved. * @return The actual number of characters by which the cursor was moved; * 0 if the cursor was not moved. */ int toNextChar ( int maxCharacterCount ); /** * Moves the cursor backwards by the number of characters given. Has * similar characteristics to the {@link #toNextChar(int) toNextChar} method. * * @param maxCharacterCount The maximum number of characters by which * the cursor should be moved. * @return The actual number of characters by which the cursor was moved; * 0 if the cursor was not moved. */ int toPrevChar ( int maxCharacterCount ); /** * Moves the cursor to the next sibling element, or returns * false and does not move the cursor if there is no next sibling * element. (By definition the position of an element is the same * as the position of its START token.) * * If the current token is not s START, the cursor will be * moved to the next START without moving out of the scope of the * current element. * * @return true if the cursor was moved; otherwise, false. */ boolean toNextSibling ( ); /** * Moves the cursor to the previous sibling element, or returns * false and does not move the cursor if there is no previous sibling * element. (By definition the position of an element is the same * as the position of its START token.) * * @return true if the cursor was moved; otherwise, false. */ boolean toPrevSibling ( ); /** * Moves the cursor to the parent element or STARTDOC, or returns * false and does not move the cursor if there is no parent.

* * Works if you're in attributes or content. Returns false only if at * STARTDOC. Note that the parent of an END token is the corresponding * START token. * * @return true if the cursor was moved; false if the cursor is at the STARTDOC * token. */ boolean toParent ( ); /** * Moves the cursor to the first child element, or returns false and * does not move the cursor if there are no element children.

* * If the cursor is not currently in an element, it moves into the * first child element of the next element. * * @return true if the cursor was moved; otherwise, false. */ boolean toFirstChild ( ); /** * Moves the cursor to the last element child, or returns false and * does not move the cursor if there are no element children. * * @return true if the cursor was moved; otherwise, false. */ boolean toLastChild ( ); /** * Moves the cursor to the first child element of the specified name in * no namespace. * * @param name The name of the element to move the cursor to. * @return true if the cursor was moved; otherwise, false. */ boolean toChild ( String name ); /** * Moves the cursor to the first child element of the specified name in the * specified namespace. * * @param namespace The namespace URI for the element to move the cursor * to. * @param name The name of the element to move to. * @return true if the cursor was moved; otherwise, false. * @throws IllegalArgumentException If the name is not a valid local name. */ boolean toChild ( String namespace, String name ); /** * Moves the cursor to the first child element of the specified qualified name. * * @param name The name of the element to move the cursor to. */ boolean toChild ( QName name ); /** * Moves the cursor to the child element specified by index. * * @param index The position of the element in the sequence of child * elements. * @return true if the cursor was moved; otherwise, false. */ boolean toChild ( int index ); /** * Moves the cursor to the specified index child element of the * specified name, where that element is the . * * @param name The name of the child element to move the cursor to. * @param index The position of the element in the sequence of child * elements. * @return true if the cursor was moved; otherwise, false. */ boolean toChild ( QName name, int index ); /** * Moves the cursor to the next sibling element of the specified name in no * namespace. * * @param name The name of the element to move the cursor to. * @return true if the cursor was moved; otherwise, false. */ boolean toNextSibling ( String name ); /** * Moves the cursor to the next sibling element of the specified name * in the specified namespace. * * @param namespace The namespace URI for the element to move the cursor * to. * @param name The name of the element to move the cursor to. * @return true if the cursor was moved; otherwise, false. */ boolean toNextSibling ( String namespace, String name ); /** * Moves the cursor to the next sibling element of the specified * qualified name. * * @param name The name of the element to move the cursor to. * @return true if the cursor was moved; otherwise, false. */ boolean toNextSibling ( QName name ); /** * Moves the cursor to the first attribute of this element, or * returns false and does not move the cursor if there are no * attributes. The order of attributes is arbitrary, but stable.

* * If the cursor is on a STARTDOC of a document-fragment, this method will * move it to the first top level attribute if one exists.

* * xmlns attributes (namespace declarations) are not considered * attributes by this function.

* * The cursor must be on a START or STARTDOC (in the case of a * document fragment with top level attributes) for this method to * succeed. * * Example for looping through attributes: *
     *      XmlCursor cursor = ... //cursor on START or STARTDOC
     *      if (cursor.toFirstAttribute())
     *      {
     *          do
     *          {
     *              // do something using attribute's name and value
     *              cursor.getName();
     *              cursor.getTextValue();
     *          }
     *          while (cursor.toNextAttribute());
     *      }
     * 
* * @return true if the cursor was moved; otherwise, false. */ boolean toFirstAttribute ( ); /** * Moves the cursor to the last attribute of this element, or * returns false and does not move the cursor if there are no * attributes. The order of attributes is arbitrary, but stable.

* * xmlns attributes (namespace declarations) are not considered * attributes by this function.

* * The cursor must be on a START or STARTDOC for this method * to succeed. * * @return true if the cursor was moved; otherwise, false. */ boolean toLastAttribute ( ); /** * Moves the cursor to the next sibling attribute, or returns * false and does not move the cursor if there is no next * sibling attribute. The order of attributes is arbitrary, but stable.

* * xmlns attributes (namespace declarations) are not considered * attributes by this function.

* * The cursor must be on an attribute for this method to succeed. * @see #toFirstAttribute() * * @return true if the cursor was moved; otherwise, false. */ boolean toNextAttribute ( ); /** * Moves the cursor to the previous sibling attribute, or returns * false and does not move the cursor if there is no previous * sibling attribute. The order of attributes is arbitrary, but stable.

* * xmlns attributes (namespace declarations) are not considered * attributes by this function.

* * The cursor must be on an attribute for this method to succeed. * * @return true if the cursor was moved; otherwise, false. */ boolean toPrevAttribute ( ); /** * When at a START or STARTDOC, returns the attribute text for the given * attribute. When not at a START or STARTDOC or the attribute does not * exist, returns null. * * @param attrName The name of the attribute whose value is requested. * @return The attribute's value if it has one; otherwise, null. */ String getAttributeText ( QName attrName ); /** * When at a START or STARTDOC, sets the attribute text for the given * attribute. When not at a START or STARTDOC returns false. * If the attribute does not exist, one is created. * * @param attrName The name of the attribute whose value is being set. * @param value The new value for the attribute. * @return true if the new value was set; otherwise, false. */ boolean setAttributeText ( QName attrName, String value ); /** * When at a START or STARTDOC, removes the attribute with the given name. * * @param attrName The name of the attribute that should be removed. * @return true if the attribute was removed; otherwise, false. */ boolean removeAttribute ( QName attrName ); /** * Gets the text value of the current document, element, attribute, * comment, procinst or text token.

* * When getting the text value of an element, non-text content such * as comments and processing instructions are ignored and text is concatenated. * For elements that have nested element children, this * returns the concatenated text of all mixed content and the * text of all the element children, recursing in first-to-last * depthfirst order.

* * For attributes, including namespaces, this returns the attribute value.

* * For comments and processing instructions, this returns the text content * of the comment or PI, not including the delimiting sequences <!-- -->, <? ?>. * For a PI, the name of the PI is also not included. *

* The value of an empty tag is the empty string.

* * If the current token is END or ENDDOC, this throws an {@link java.lang.IllegalStateException}.

* * @return The text value of the current token if the token's type is * START, STARTDOC, TEXT, ATTR, COMMENT, PROCINST, or NAMESPACE; null * if the type is NONE. */ String getTextValue ( ); /** * Copies the text value of the current document, element, attribute, * comment, processing instruction or text token, counting right from * this cursor's location up to maxCharacterCount, * and copies the returned text into returnedChars.

* * When getting the text value of an element, non-text content such * as comments and processing instructions are ignored and text is concatenated. * For elements that have nested element children, this * returns the concatenated text of all mixed content and the * text of all the element children, recursing in first-to-last * depthfirst order.

* * For attributes, including namespaces, this returns the attribute value.

* * For comments and processing instructions, this returns the text contents * of the comment or PI, not including the delimiting sequences <!-- -->, <? ?>. For * a PI, the text will not include the name of the PI.

* * If the current token is END or ENDDOC, this throws an {@link java.lang.IllegalStateException}.

* * The value of an empty tag is the empty string.

* * @param returnedChars A character array to hold the returned characters. * @param offset The position within returnedChars to which the first of the * returned characters should be copied. * @param maxCharacterCount The maximum number of characters after this cursor's * location to copy. A negative value specifies that all characters should be copied. * @return The actual number of characters copied; 0 if no characters * were copied. */ int getTextValue ( char[] returnedChars, int offset, int maxCharacterCount ); /** * Returns the characters of the current TEXT token. If the current token * is not TEXT, returns "". If in the middle of a TEXT token, returns * those chars to the right of the cursor of the TEXT token. * * @return The requested text; an empty string if the current token type is * not TEXT. */ /** * Sets the text value of the XML at this cursor's location if that XML's * token type is START, STARTDOC, ATTR, COMMENT or PROCINST.

* * For elements that have nested children this first removes all * the content of the element and replaces it with the given text. * * @param text The text to use as a new value. * @throws java.lang.IllegalStateException If the token type at this * cursor's location is not START, STARTDOC, ATTR, COMMENT or * PROCINST. */ void setTextValue ( String text ); /** * Sets the text value of the XML at this cursor's location (if that XML's * token type is START, STARTDOC, ATTR, COMMENT or PROCINST) to the * contents of the specified character array.

* * For elements that have nested children this first removes all * the content of the element and replaces it with the given text. * * @param sourceChars A character array containing the XML's new value. * @param offset The position within sourceChars from which the first of * the source characters should be copied. * @param length The maximum number of characters to set as the XML's new * value. * @throws java.lang.IllegalArgumentException If the token type at this * cursor's location is not START, STARTDOC, ATTR, COMMENT or * PROCINST. */ void setTextValue ( char[] sourceChars, int offset, int length ); /** * Returns characters to the right of the cursor up to the next token. */ String getChars ( ); /** * Copies characters up to the specified maximum number, counting right from * this cursor's location to the character at maxCharacterCount. The * returned characters are added to returnedChars, with the first * character copied to the offset position. The maxCharacterCount * parameter should be less than or equal to the length of returnedChars * minus offset. Copies a number of characters, which is * either maxCharacterCount or the number of characters up to the next token, * whichever is less. * * @param returnedChars A character array to hold the returned characters. * @param offset The position within returnedChars at which the first of the * returned characters should be added. * @param maxCharacterCount The maximum number of characters after this cursor's * location to return. * @return The actual number of characters returned; 0 if no characters * were returned or if the current token is not TEXT. */ int getChars ( char[] returnedChars, int offset, int maxCharacterCount ); /** * Moves the cursor to the STARTDOC token, which is the * root of the document. */ void toStartDoc ( ); /** * Moves the cursor to the ENDDOC token, which is the end * of the document. */ void toEndDoc ( ); /** * Determines if the specified cursor is in the same document as * this cursor. * * @param cursor The cursor that may be in the same document * as this cursor. * @return true if the specified cursor is in the same document; * otherwise, false. */ boolean isInSameDocument ( XmlCursor cursor ); /** * Returns an integer indicating whether this cursor is before, * after, or at the same position as the specified cursor.

* * a.comparePosition(b) < 0 means a is to the left of b.
* a.comparePosition(b) == 0 means a is at the same position as b.
* a.comparePosition(b) > 0 means a is to the right of b.

* * The sort order of cursors in the document is the token order. * For example, if cursor "a" is at a START token and the cursor "b" * is at a token within the contents of the same element, then * a.comparePosition(b) will return -1, meaning that the position * of a is before b. * * @param cursor The cursor whose position should be compared * with this cursor. * @return 1 if this cursor is after the specified cursor; 0 if * this cursor is at the same position as the specified cursor; * -1 if this cursor is before the specified cursor. * @throws java.lang.IllegalArgumentException If the specified * cursor is not in the same document as this cursor. */ int comparePosition ( XmlCursor cursor ); /** * Determines if this cursor is to the left of (or before) * the specified cursor. Note that this is the same as * a.comparePosition(b) < 0 * * @param cursor The cursor whose position should be compared * with this cursor. * @return true if this cursor is to the left of the specified * cursor; otherwise, false. */ boolean isLeftOf ( XmlCursor cursor ); /** * Determines if this cursor is at the same position as * the specified cursor. Note that this is the same as * a.comparePosition(b) == 0 * * @param cursor The cursor whose position should be compared * with this cursor. * @return true if this cursor is at the same position as * the specified cursor; otherwise, false. */ boolean isAtSamePositionAs ( XmlCursor cursor ); /** * Determines if this cursor is to the right of (or after) * the specified cursor. Note that this is the same as * a.comparePosition(b) > 0 * * @param cursor The cursor whose position should be compared * with this cursor. * @return true if this cursor is to the right of the specified * cursor; otherwise, false. */ boolean isRightOf ( XmlCursor cursor ); /** * Executes the specified XQuery expression against the XML this * cursor is in.

* * The query may be a String or a compiled query. You can precompile * an XQuery expression using the XmlBeans.compileQuery method.

* * The root referred to by the expression should be given as * a dot. The following is an example path expression: *
     * XmlCursor results = cursor.execQuery("purchase-order/line-item[price <= 20.00]");
     * 
* * @param query The XQuery expression to execute. * @return A cursor containing the results of the query. * @throws XmlRuntimeException If the query expression is invalid. */ XmlCursor execQuery ( String query ); /** * Executes the specified XQuery expression against the XML this * cursor is in, and using the specified options.

* * @param query The XQuery expression to execute. * @param options Options for the query. For example, you can call * the {@link XmlOptions#setXqueryCurrentNodeVar(String) XmlOptions.setXqueryCurrentNodeVar(String)} * method to specify a particular name for the query expression * variable that indicates the context node. * @throws XmlRuntimeException If the query expression is invalid. */ XmlCursor execQuery ( String query, XmlOptions options ); /** * Represents the state of a dcoument at a particular point * in time. It is used to determine if a document has been changed * since that point in time. */ interface ChangeStamp { /** * Returns whether or not the document assoiated with this ChangeStamp * has been altered since the ChangeStamp had been created. */ public boolean hasChanged ( ); } /** * Returns the current change stamp for the document the current cursor is in. * This change stamp can be queried at a later point in time to find out * if the document has changed. * * @return The change stamp for the document the current cursor is in. */ ChangeStamp getDocChangeStamp ( ); /** * Subclasses of XmlBookmark can be used to annotate an XML document. * This class is abstract to prevent parties from inadvertently * interfering with each others' bookmarks without explicitly * sharing a bookmark class. */ abstract class XmlBookmark { /** * Constructs a strongly-referenced bookmark. */ public XmlBookmark ( ) { this( false ); } /** * Constructs a bookmark. * @param weak true if the document's reference to the bookmark should be a WeakReference */ public XmlBookmark ( boolean weak ) { _ref = weak ? new WeakReference( this ) : null; } /** * Call the createCursor method to create a new cursor which is * positioned at the same splace as the bookmark. It is much more * efficient to call toBookmark on an existing cursor than it * is to create a new cursor. However, toBookmark may fail if the * bookmark is in a different document than the cursor. It is * under these circumstances where createCursor needs to be called * on the bookmark. Subsequent navigations to bookmark * positions should attempt to reuse the last cursor to * improve performace. * * @return the new cursor */ public final XmlCursor createCursor ( ) { return _currentMark == null ? null : _currentMark.createCursor(); } /** * @param c the cursor to be moved * @return the given cursor moved to this bookmark */ public final XmlCursor toBookmark ( XmlCursor c ) { return c == null || !c.toBookmark( this ) ? createCursor() : c; } /** * The default key for bookmarks is the class which implements * them. This way, multiple parties using bookmarks in the * same instance document will not interfere with eachother. * One can, however, override getKey() to use a key other than * the class. * * @return default key for bookmarks */ public Object getKey ( ) { return this.getClass(); } /** * The mark is set by the host document; it is capable of * returning an XmlCursor implementation at the location of * the bookmark. */ public XmlMark _currentMark; /** * If non-null, the ref is used by the host document * to maintain a reference to the bookmark. If it is a weak * reference, the host document will not prevent the Bookmark * from being garbage collected. */ public final Reference _ref; } /** * An abstract {@link XmlCursor} factory. * Implementations of XmlCursor implement XmlMark to be able to * reconstitute a cursor from a bookmark. When content moves between * implementations, the XmlMark is set to the implmentation's which * receives the new content. */ interface XmlMark { XmlCursor createCursor ( ); } /** * Sets a bookmark to the document at this cursor's location. * * The bookmark is attached to the token in the tree immediately * after the cursor. If the tree is manipulated to move * that object to a different place, the bookmark moves with it. * If the tree is manipulated to delete that token from the * tree, the bookmark is orphaned. Copy operations do not copy * bookmarks. * * @param bookmark The bookmark to set. */ void setBookmark ( XmlBookmark bookmark ); /** * Retrieves the bookmark with the specified key * at this cursor's location. If there is no bookmark whose key is * given by the specified key at the current position, null is returned. * If the {@link XmlCursor.XmlBookmark#getKey() getKey} method is not overridden on * the bookmark, then the bookmark's class is used as the key. * * @param key The key for the bookmark to retrieve. * @return The requested bookmark; null if there is no bookmark * corresponding to the specified key. */ XmlBookmark getBookmark ( Object key ); /** * Clears the bookmark whose key is specified, if the bookmark * exists at this cursor's location. * * @param key The for the bookmark to clear. */ void clearBookmark ( Object key ); /** * Retrieves all the bookmarks at this location, adding them to * the specified collection. Bookmarks held by weak references are * added to this collection as Weak referenced objects pointing to the * bookmark. * * @param listToFill The collection that will contain bookmarks * returned by this method. */ void getAllBookmarkRefs ( Collection listToFill ); /** * Removes the XML that is immediately after this cursor. * * For the TEXT, ATTR, NAMESPACE, COMMENT and PROCINST tokens, a single * token is removed. For a START token, the corresponding element and all * of its contents are removed. For all other tokens, this is a no-op. * You cannot remove a STARTDOC. * * The cursors located in the XML that was removed all collapse to the * same location. All bookmarks in this XML will be orphaned. * * @return true if anything was removed; false only if the cursor is * just before END or ENDDOC token. * @throws java.lang.IllegalArgumentException If the cursor is at a * STARTDOC token. */ boolean removeXml ( ); /** * Moves the XML immediately after this cursor to the location * specified by the toHere cursor, shifting XML at that location * to the right to make room. For the TEXT, ATTR, NAMESPACE, * COMMENT and PROCINST tokens, a single token is moved. For a start token, the * element and all of its contents are moved. For all other tokens, this * is a no-op. * * The bookmarks located in the XML that was moved also move to the * new location; the cursors don't move with the content. * * @param toHere The cursor at the location to which the XML should * be moved. * @return true if anything was moved. This only happens when the XML to be * moved contains the target of the move. * @throws java.lang.IllegalArgumentException If the operation is not allowed * at the cursor's location. This includes attempting to move an end token or the * document as a whole. Also, moving to a location before the start document or moving * an attribute to a location other than after another attribute or start token * will throw. */ boolean moveXml ( XmlCursor toHere ); /** * Copies the XML immediately after this cursor to the location * specified by the toHere cursor. For the TEXT, ATTR, NAMESPACE, * COMMENT and PROCINST tokens, a single token is copied. For a start token, * the element and all of its contents are copied. For all other tokens, this * is a no-op. * * The cursors and bookmarks located in the XML that was copied are also copied * to the new location. * * @param toHere The cursor at the location to which the XML should * be copied. * @return true if anything was copied; false if the token supports the operation, * but nothing was copied. * @throws java.lang.IllegalArgumentException If the operation is not allowed * at the cursor's location. */ boolean copyXml ( XmlCursor toHere ); /** * Removes the contents of the container (STARTDOC OR START) immediately after * this cursor. For all other situations, returns false. Does * not remove attributes or namspaces. * * @return true if anything was copied; otherwise, false. */ boolean removeXmlContents ( ); /** * Moves the contents of the container (STARTDOC OR START) immediately after * this cursor to the location specified by the toHere cursor. * For all other situations, returns false. Does not move attributes or * namespaces. * * @param toHere The cursor at the location to which the XML should be moved. * @return true if anything was moved; otherwise, false. */ boolean moveXmlContents ( XmlCursor toHere ); /** * Copies the contents of the container (STARTDOC OR START) immediately to * the right of the cursor to the location specified by the toHere cursor. * For all other situations, returns false. Does not copy attributes or * namespaces. * * @param toHere The cursor at the location to which the XML should * be copied. * @return true if anything was copied; otherwise, false. */ boolean copyXmlContents ( XmlCursor toHere ); /** * Removes characters up to the specified maximum number, counting right from * this cursor's location to the character at maxCharacterCount. The * space remaining from removing the characters collapses up to this cursor. * * @param maxCharacterCount The maximum number of characters after this cursor's * location to remove. * @return The actual number of characters removed. * @throws java.lang.IllegalArgumentException If the operation is not allowed * at the cursor's location. */ int removeChars ( int maxCharacterCount ); /** * Moves characters immediately after this cursor to the position immediately * after the specified cursor. Characters are counted to the right up to the * specified maximum number. XML after the destination cursor is * shifted to the right to make room. The space remaining from moving the * characters collapses up to this cursor. * * @param maxCharacterCount The maximum number of characters after this cursor's * location to move. * @param toHere The cursor to which the characters should be moved. * @return The actual number of characters moved. * @throws java.lang.IllegalArgumentException If the operation is not allowed * at the cursor's location. */ int moveChars ( int maxCharacterCount, XmlCursor toHere ); /** * Copies characters to the position immediately after the specified cursor. * Characters are counted to the right up to the specified maximum number. * XML after the destination cursor is shifted to the right to make room. * * @param maxCharacterCount The maximum number of characters after this cursor's * location to copy. * @param toHere The cursor to which the characters should be copied. * @return The actual number of characters copied. * @throws java.lang.IllegalArgumentException If the operation is not allowed * at the cursor's location. */ int copyChars ( int maxCharacterCount, XmlCursor toHere ); /** * Inserts the specified text immediately before this cursor's location. * * @param text The text to insert. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void insertChars ( String text ); /** * Inserts an element immediately before this cursor's location, giving * the element the specified qualified name. * * @param name The qualified name for the element. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void insertElement ( QName name ); /** * Inserts an element immediately before this cursor's location, giving * the element the specified local name. * * @param localName The local name for the new element. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void insertElement ( String localName ); /** * Inserts a new element immediately before this cursor's location, giving the * element the specified local name and associating it with specified namespace * * @param localName The local name for the new element. * @param uri The URI for the new element's namespace. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void insertElement ( String localName, String uri ); /** * Inserts a new element around this cursor, giving the element the specified * qualified name. After the element is inserted, this cursor is between its start * and end. This cursor can then be used to insert additional XML into * the new element. * * @param name The qualified name for the new element. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void beginElement ( QName name ); /** * Inserts a new element around this cursor, giving the element the specified * local name. After the element is inserted, this cursor is between its start * and end. This cursor can then be used to insert additional XML into * the new element. * * @param localName The local name for the new element. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void beginElement ( String localName ); /** * Inserts a new element around this cursor, giving the element the specified * local name and associating it with the specified namespace. After the element * is inserted, this cursor is between its start and end. This cursor * can then be used to insert additional XML into the new element. * * @param localName The local name for the new element. * @param uri The URI for the new element's namespace. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void beginElement ( String localName, String uri ); /** * Inserts a new element immediately before this cursor's location, giving the * element the specified qualified name and content. * * @param name The qualified name for the new element. * @param text The content for the new element. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void insertElementWithText ( QName name, String text ); /** * Inserts a new element immediately before this cursor's location, giving the * element the specified local name and content. * * @param localName The local name for the new element. * @param text The content for the new element. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void insertElementWithText ( String localName, String text ); /** * Inserts a new element immediately before this cursor's location, giving the * element the specified local name, associating it with the specified namespace, * and giving it the specified content. * * @param localName The local name for the new element. * @param uri The URI for the new element's namespace. * @param text The content for the new element. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void insertElementWithText ( String localName, String uri, String text ); /** * Inserts a new attribute immediately before this cursor's location, giving it * the specified local name. * * @param localName The local name for the new attribute. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void insertAttribute ( String localName ); /** * Inserts a new attribute immediately before this cursor's location, giving it * the specified local name and associating it with the specified namespace. * * @param localName The local name for the new attribute. * @param uri The URI for the new attribute's namespace. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void insertAttribute ( String localName, String uri ); /** * Inserts a new attribute immediately before this cursor's location, giving it * the specified name. * * @param name The local name for the new attribute. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void insertAttribute ( QName name ); /** * Inserts a new attribute immediately before this cursor's location, giving it * the specified value and name. * * @param Name The local name for the new attribute. * @param value The value for the new attribute. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void insertAttributeWithValue ( String Name, String value ); /** * Inserts an attribute immediately before the cursor's location, giving it * the specified name and value, and associating it with the specified namespace. * * @param name The name for the new attribute. * @param uri The URI for the new attribute's namespace. * @param value The value for the new attribute. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void insertAttributeWithValue ( String name, String uri, String value ); /** * Inserts an attribute immediately before the cursor's location, giving it * the specified name and value. * * @param name The name for the new attribute. * @param value The value for the new attribute. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void insertAttributeWithValue ( QName name, String value ); /** * Inserts a namespace declaration immediately before the cursor's location, * giving it the specified prefix and URI. * * @param prefix The prefix for the namespace. * @param namespace The URI for the namespace. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void insertNamespace ( String prefix, String namespace ); /** * Inserts an XML comment immediately before the cursor's location, * giving it the specified content. * * @param text The new comment's content. * @throws java.lang.IllegalArgumentException If the insertion is not allowed * at the cursor's location. */ void insertComment ( String text ); /** * Inserts an XML processing instruction immediately before the cursor's location, * giving it the specified target and text. * * @param target The target for the processing instruction. * @param text The new processing instruction's text. * @throws java.lang.IllegalStateException If the insertion is not allowed * at the cursor's location. */ void insertProcInst ( String target, String text ); }




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