gcc/libjava/javax/swing/text/html/parser/AttributeList.java

/* AttributeList.java --
   Copyright (C) 2005 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
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permission to link this library with independent modules to produce an
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package javax.swing.text.html.parser;

import gnu.javax.swing.text.html.parser.support.gnuStringIntMapper;

import java.io.Serializable;

import java.util.Enumeration;
import java.util.Vector;

/**
 * <p>
 * Stores the attribute information, obtained by parsing SGML (DTD) tag
 * <code>&lt;!ATTLIST .. &gt;</code></p>
 * <p>
 * Elements can have a associated named properties (attributes) having the
 * assigned values. The element start tag can have any number of attribute
 * value pairs, separated by spaces. They can appear in any order.
 * SGML requires you to delimit the attribute values using either double (")
 * or single (') quotation marks.  In HTML, it is possible
 * (but not recommended) to specify the value of an attribute without
 * quotation marks. Such attribute value may only contain
 * letters, digits, hyphens (-) and periods (.) .
 * </p>
 * <p>
 * The <code>AttributeList</code> defines a single attribute that additionally
 * has a pointer referencing the possible subsequent attribute.
 * The whole structure is just a simple linked list, storing all attributes of
 * some <code>Element</code>.
 * Use the <code>getNext()</code> method repeatedly to see all attributes in
 * the list.
 * </p>
 * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
 */
public final class AttributeList
  implements DTDConstants, Serializable
{
  /** Maps between type names and they string values. */
  private static final gnuStringIntMapper mapper =
    new gnuStringIntMapper()
    {
      protected void create()
      {
        add("CDATA", DTDConstants.CDATA);
        add("ENTITY", DTDConstants.ENTITY);
        add("ENTITIES", DTDConstants.ENTITIES);
        add("ID", DTDConstants.ID);
        add("IDREF", DTDConstants.IDREF);
        add("IDREFS", DTDConstants.IDREFS);
        add("NAME", DTDConstants.NAME);
        add("NAMES", DTDConstants.NAMES);
        add("NMTOKEN", DTDConstants.NMTOKEN);
        add("NMTOKENS", DTDConstants.NMTOKENS);
        add("NOTATION", DTDConstants.NOTATION);
        add("NUMBER", DTDConstants.NUMBER);
        add("NUMBERS", DTDConstants.NUMBERS);
        add("NUTOKEN", DTDConstants.NUTOKEN);
        add("NUTOKENS", DTDConstants.NUTOKENS);
      }
    };

  /** Use serialVersionUID for interoperability. */
  private static final long serialVersionUID = -1361214058742015233L;

  /**
   * The value of ( = pointer to ) the next attribute in the linked list,
   * storing all attributes of some Element. Contains null for the
   * last attribute.
   */
  public AttributeList next;

  /**
   * The name of the attribute. The attribute names are case insensitive.
   */
  public String name;

  /**
   * The default value of this attribute. Equals to null if no default value
   * is specified.
   */
  public String value;

  /**
   * The explicit set of the allowed values of this attribute. Equals to
   * null, if this parameter was not specified.
   * Values, defined in DTD, are case insensitive.
   */
  public Vector values;

  /**
   * The modifier of this attribute. This field contains one of the
   * following DTD constants:
   * <ul>
   * <li> REQUIRED if the attribute value is always required,</li>
   * <li> IMPLIED if the user agent must supply the default value itself,</li>
   * <li> FIXED if the attribute value is fixed to some value and cannot
   * be changed.</li>
   * <li> DEFAULT if the attribute default value has been supplied.</li>
   * <li> CURRENT the value that at any point in the document is
   * the last value supplied for that element. A value is required to be
   * supplied for the first* occurrence of an element</li>
   * <li> CONREF specifies the IDREF value of
   * the reference to content in another location of the document.
   * The element with this attribute is empty, the content from
   * that another location must be used instead.</li>
   * </ul>
   */
  public int modifier;

  /**
   * The type of the attribute. The possible values of this field
   * (NUMBER, NAME, ID, CDATA and so on) are defined in DTDConstants.
   */
  public int type;

  /**
   * Creates the attribute with the given name, initializing other fields
   * to the default values ( 0 and null ).
   *
   * @param a_name The name of the attribute.
   */
  public AttributeList(String a_name)
  {
    name = a_name;
  }

  /**
   * Creates the attribute with the given properties.
   * @param a_name The name of the attribute
   * @param a_type The type of the attribute. The possible values are defined
   * in <code> DTDConstants</code>.
   * @param a_modifier The modifier of this attribute. The possible values
   * are defined in <code> DTDConstants</code>.
   * @param a_default The default value of this attribute
   * @param allowed_values The explicit set of the allowed values of
   * this attribute
   * @param a_next The value of the subsequent instance of the AttributeList,
   * representing the next attribute definition for the same element.
   * Equals to null for the last attribute definition.
   */
  public AttributeList(String a_name, int a_type, int a_modifier,
                       String a_default, Vector allowed_values,
                       AttributeList a_next
                      )
  {
    this(a_name);
    type = a_type;
    modifier = a_modifier;
    value = a_default;
    values = allowed_values;
    next = a_next;
  }

  /**
   * Get the modifier of this attribute. This field contains one of the
   * following DTD constants:
   * <ul>
   * <li> REQUIRED if the attribute value is always required,</li>
   * <li> IMPLIED if the user agent must supply the default value itself,</li>
   * <li> FIXED if the attribute value is fixed to some value and cannot
   * be changed.</li>
   * <li> DEFAULT if the attribute default value has been supplied.</li>
   * <li> CURRENT the value that at any point in the document is
   * the last value supplied for that element. A value is required to be
   * supplied for the first* occurrence of an element</li>
   * <li> CONREF specifies the IDREF value of
   * the reference to content in another location of the document.
   * The element with this attribute is empty, the content from
   * that another location must be used instead.</li>
   * </ul>
   */
  public int getModifier()
  {
    return modifier;
  }

  /**
   * Get the name of the attribute.
   * The value is returned as it was supplied to a
   * constructor, preserving the character case.
   */
  public String getName()
  {
    return name;
  }

  /**
   * Get the value of ( = pointer to ) the next attribute in the linked list,
   * storing all attributes of some Element. Contains null for the
   * last attribute.
   */
  public AttributeList getNext()
  {
    return next;
  }

  /**
   * Get the type of the attribute. The possible values of this field
   * (NUMBER, NAME, ID, CDATA and so on) are defined in DTDConstants.
   */
  public int getType()
  {
    return type;
  }

  /**
   * Get the default value of this attribute.
   */
  public String getValue()
  {
    return value;
  }

  /**
   * Get the allowed values of this attribute.
   */
  public Enumeration getValues()
  {
    return values.elements();
  }

  /**
   * Converts a string value, representing a valid SGLM attribute type,
   * into the corresponding value, defined in DTDConstants.
   * @param typeName the name of the type (character case is ignored).
   * @return a value from DTDConstants or DTDConstants.ANY if the
   * string is not representing a known type. The known attribute types
   * in this implementation are CDATA, ENTITY, ENTITIES, ID, IDREF, IDREFS,
   *  NAME, NAMES, NMTOKEN, NMTOKENS, NOTATION, NUMBER, NUMBERS, NUTOKEN and
   *  NUTOKENS.
   * @throws NullPointerException if the passed parameter is null.
   */
  public static int name2type(String typeName)
  {
    return mapper.get(typeName.toUpperCase());
  }

  /**
   * Returns the attribute name.
   */
  public String toString()
  {
    return name;
  }

  /**
   * Converts a value from DTDConstants into the string representation.
   * @param type - an integer value of the public static integer field,
   * defined in the DTDConstants class.
   * @return a corresponding SGML DTD keyword (UPPERCASE) or null if there
   * are no attribute type constant having the given value.
   */
  public static String type2name(int type)
  {
    return mapper.get(type);
  }
}