Java example source code file (Element.java)

This example Java source code file (Element.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

any, attributelist, awt, bitset, contentmodel, dtdconstants, element, empty, hashtable, integer, max_index_key, object, rcdata, serializable, string, util

The Element.java Java example source code

/*
 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.swing.text.html.parser;

import java.util.Hashtable;
import java.util.BitSet;
import java.io.*;
import sun.awt.AppContext;

/**
 * An element as described in a DTD using the ELEMENT construct.
 * This is essential the description of a tag. It describes the
 * type, content model, attributes, attribute types etc. It is used
 * to correctly parse a document by the Parser.
 *
 * @see DTD
 * @see AttributeList
 * @author Arthur van Hoff
 */
public final
class Element implements DTDConstants, Serializable {
    public int index;
    public String name;
    public boolean oStart;
    public boolean oEnd;
    public BitSet inclusions;
    public BitSet exclusions;
    public int type = ANY;
    public ContentModel content;
    public AttributeList atts;

    /**
     * A field to store user data. Mostly used to store
     * style sheets.
     */
    public Object data;

    Element() {
    }

    /**
     * Create a new element.
     */
    Element(String name, int index) {
        this.name = name;
        this.index = index;
        if (index > getMaxIndex()) {
            AppContext.getAppContext().put(MAX_INDEX_KEY, index);
        }
    }

    private static final Object MAX_INDEX_KEY = new Object();

    static int getMaxIndex() {
        Integer value = (Integer) AppContext.getAppContext().get(MAX_INDEX_KEY);
        return (value != null)
                ? value.intValue()
                : 0;
    }

    /**
     * Get the name of the element.
     */
    public String getName() {
        return name;
    }

    /**
     * Return true if the start tag can be omitted.
     */
    public boolean omitStart() {
        return oStart;
    }

    /**
     * Return true if the end tag can be omitted.
     */
    public boolean omitEnd() {
        return oEnd;
    }

    /**
     * Get type.
     */
    public int getType() {
        return type;
    }

    /**
     * Get content model
     */
    public ContentModel getContent() {
        return content;
    }

    /**
     * Get the attributes.
     */
    public AttributeList getAttributes() {
        return atts;
    }

    /**
     * Get index.
     */
    public int getIndex() {
        return index;
    }

    /**
     * Check if empty
     */
    public boolean isEmpty() {
        return type == EMPTY;
    }

    /**
     * Convert to a string.
     */
    public String toString() {
        return name;
    }

    /**
     * Get an attribute by name.
     */
    public AttributeList getAttribute(String name) {
        for (AttributeList a = atts ; a != null ; a = a.next) {
            if (a.name.equals(name)) {
                return a;
            }
        }
        return null;
    }

    /**
     * Get an attribute by value.
     */
    public AttributeList getAttributeByValue(String name) {
        for (AttributeList a = atts ; a != null ; a = a.next) {
            if ((a.values != null) && a.values.contains(name)) {
                return a;
            }
        }
        return null;
    }


    static Hashtable<String, Integer> contentTypes = new Hashtable();

    static {
        contentTypes.put("CDATA", Integer.valueOf(CDATA));
        contentTypes.put("RCDATA", Integer.valueOf(RCDATA));
        contentTypes.put("EMPTY", Integer.valueOf(EMPTY));
        contentTypes.put("ANY", Integer.valueOf(ANY));
    }

    public static int name2type(String nm) {
        Integer val = contentTypes.get(nm);
        return (val != null) ? val.intValue() : 0;
    }
}