document.java

一个用于搜索本地文件内容的小型搜索引擎

/*--

 $Id: Document.java,v 1.85 2007/11/10 05:28:58 jhunter Exp $

 Copyright (C) 2000-2007 Jason Hunter & Brett McLaughlin.
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:

 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions, and the following disclaimer.

 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions, and the disclaimer that follows
    these conditions in the documentation and/or other materials
    provided with the distribution.

 3. The name "JDOM" must not be used to endorse or promote products
    derived from this software without prior written permission.  For
    written permission, please contact <request_AT_jdom_DOT_org>.

 4. Products derived from this software may not be called "JDOM", nor
    may "JDOM" appear in their name, without prior written permission
    from the JDOM Project Management <request_AT_jdom_DOT_org>.

 In addition, we request (but do not require) that you include in the
 end-user documentation provided with the redistribution and/or in the
 software itself an acknowledgement equivalent to the following:
     "This product includes software developed by the
      JDOM Project (http://www.jdom.org/)."
 Alternatively, the acknowledgment may be graphical using the logos
 available at http://www.jdom.org/images/logos.

 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED.  IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

 This software consists of voluntary contributions made by many
 individuals on behalf of the JDOM Project and was originally
 created by Jason Hunter <jhunter_AT_jdom_DOT_org> and
 Brett McLaughlin <brett_AT_jdom_DOT_org>.  For more information
 on the JDOM Project, please see <http://www.jdom.org/>.

 */

package org.jdom;

import java.util.*;
import org.jdom.filter.*;

/**
 * An XML document. Methods allow access to the root element as well as the
 * {@link DocType} and other document-level information.
 *
 * @version $Revision: 1.85 $, $Date: 2007/11/10 05:28:58 $
 * @author  Brett McLaughlin
 * @author  Jason Hunter
 * @author  Jools Enticknap
 * @author  Bradley S. Huffman
 */
public class Document implements Parent {

    private static final String CVS_ID =
      "@(#) $RCSfile: Document.java,v $ $Revision: 1.85 $ $Date: 2007/11/10 05:28:58 $ $Name: jdom_1_1 $";

    /**
     * This document's content including comments, PIs, a possible
     * DocType, and a root element.
     * Subclassers have to track content using their own
     * mechanism.
     */
    ContentList content = new ContentList(this);

    /**
     *  See http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/core.html#baseURIs-Considerations
     */
    protected String baseURI = null;

    // Supports the setProperty/getProperty calls
    private HashMap propertyMap = null;

    /**
     * Creates a new empty document.  A document must have a root element,
     * so this document will not be well-formed and accessor methods will
     * throw an IllegalStateException if this document is accessed before a
     * root element is added.  This method is most useful for build tools.
     */
    public Document() {}

    /**
     * This will create a new <code>Document</code>,
     * with the supplied <code>{@link Element}</code>
     * as the root element, the supplied
     * <code>{@link DocType}</code> declaration, and the specified
     * base URI.
     *
     * @param rootElement <code>Element</code> for document root.
     * @param docType <code>DocType</code> declaration.
     * @param baseURI the URI from which this doucment was loaded.
     * @throws IllegalAddException if the given docType object
     *         is already attached to a document or the given
     *         rootElement already has a parent
     */
    public Document(Element rootElement, DocType docType, String baseURI) {
        if (rootElement != null) {
            setRootElement(rootElement);
        }
        if (docType != null) {
            setDocType(docType);
        }
        if (baseURI != null) {
            setBaseURI(baseURI);
        }
    }

    /**
     * This will create a new <code>Document</code>,
     * with the supplied <code>{@link Element}</code>
     * as the root element and the supplied
     * <code>{@link DocType}</code> declaration.
     *
     * @param rootElement <code>Element</code> for document root.
     * @param docType <code>DocType</code> declaration.
     * @throws IllegalAddException if the given DocType object
     *         is already attached to a document or the given
     *         rootElement already has a parent
     */
    public Document(Element rootElement, DocType docType) {
        this(rootElement, docType, null);
    }

    /**
     * This will create a new <code>Document</code>,
     * with the supplied <code>{@link Element}</code>
     * as the root element, and no <code>{@link DocType}</code>
     * declaration.
     *
     * @param rootElement <code>Element</code> for document root
     * @throws IllegalAddException if the given rootElement already has
     *         a parent.
     */
    public Document(Element rootElement) {
        this(rootElement, null, null);
    }

    /**
     * This will create a new <code>Document</code>,
     * with the supplied list of content, and a
     * <code>{@link DocType}</code> declaration only if the content
     * contains a DocType instance.  A null list is treated the
     * same as the no-arg constructor.
     *
     * @param content <code>List</code> of starter content
     * @throws IllegalAddException if the List contains more than
     *         one Element or objects of illegal types.
     */
    public Document(List content) {
        setContent(content);
    }

    public int getContentSize() {
        return content.size();
    }

    public int indexOf(Content child) {
        return content.indexOf(child);
    }

//    /**
//     * Starting at the given index (inclusive), return the index of
//     * the first child matching the supplied filter, or -1
//     * if none is found.
//     *
//     * @return index of child, or -1 if none found.
//     */
//    private int indexOf(int start, Filter filter) {
//        int size = getContentSize();
//        for (int i = start; i < size; i++) {
//            if (filter.matches(getContent(i))) {
//                return i;
//            }
//        }
//        return -1;
//    }

    /**
     * This will return <code>true</code> if this document has a
     * root element, <code>false</code> otherwise.
     *
     * @return <code>true</code> if this document has a root element,
     *         <code>false</code> otherwise.
     */
    public boolean hasRootElement() {
        return (content.indexOfFirstElement() < 0) ? false : true;
    }

    /**
     * This will return the root <code>Element</code>
     * for this <code>Document</code>
     *
     * @return <code>Element</code> - the document's root element
     * @throws IllegalStateException if the root element hasn't been set
     */
    public Element getRootElement() {
        int index = content.indexOfFirstElement();
        if (index < 0) {
            throw new IllegalStateException("Root element not set");
        }
        return (Element) content.get(index);
    }

    /**
     * This sets the root <code>{@link Element}</code> for the
     * <code>Document</code>. If the document already has a root
     * element, it is replaced.
     *
     * @param rootElement <code>Element</code> to be new root.
     * @return <code>Document</code> - modified Document.
     * @throws IllegalAddException if the given rootElement already has
     *         a parent.
     */
    public Document setRootElement(Element rootElement) {
        int index = content.indexOfFirstElement();
        if (index < 0) {
            content.add(rootElement);
        }
        else {
            content.set(index, rootElement);
        }
        return this;
    }

    /**
     * Detach the root <code>{@link Element}</code> from this document.
     *
     * @return removed root <code>Element</code>
     */
    public Element detachRootElement() {
        int index = content.indexOfFirstElement();
        if (index < 0)
            return null;
        return (Element) removeContent(index);
    }

    /**
     * This will return the <code>{@link DocType}</code>
     * declaration for this <code>Document</code>, or
     * <code>null</code> if none exists.
     *
     * @return <code>DocType</code> - the DOCTYPE declaration.
     */
    public DocType getDocType() {
        int index = content.indexOfDocType();
        if (index < 0) {
            return null;
        }
        else {
            return (DocType) content.get(index);
        }
    }

    /**
     * This will set the <code>{@link DocType}</code>
     * declaration for this <code>Document</code>. Note
     * that a DocType can only be attached to one Document.
     * Attempting to set the DocType to a DocType object
     * that already belongs to a Document will result in an
     * IllegalAddException being thrown.
     *
     * @param docType <code>DocType</code> declaration.
     * @return object on which the method was invoked
     * @throws IllegalAddException if the given docType is
     *   already attached to a Document.
     */
    public Document setDocType(DocType docType) {
        if (docType == null) {
            // Remove any existing doctype
            int docTypeIndex = content.indexOfDocType();
            if (docTypeIndex >= 0) content.remove(docTypeIndex);
            return this;
        }

        if (docType.getParent() != null) {
            throw new IllegalAddException(docType,
                              "The DocType already is attached to a document");
        }

        // Add DocType to head if new, replace old otherwise
        int docTypeIndex = content.indexOfDocType();
        if (docTypeIndex < 0) {
            content.add(0, docType);
        }
        else {
            content.set(docTypeIndex, docType);
        }

        return this;
    }

    /**
     * Appends the child to the end of the content list.
     *
     * @param child   child to append to end of content list
     * @return        the document on which the method was called
     * @throws IllegalAddException if the given child already has a parent.
     */
    public Document addContent(Content child) {
        content.add(child);
        return this;
    }

    /**
     * Appends all children in the given collection to the end of
     * the content list.  In event of an exception during add the
     * original content will be unchanged and the objects in the supplied
     * collection will be unaltered.
     *
     * @param c   collection to append
     * @return    the document on which the method was called
     * @throws IllegalAddException if any item in the collection
     *         already has a parent or is of an illegal type.
     */
    public Document addContent(Collection c) {
        content.addAll(c);
        return this;
    }

    /**
     * Inserts the child into the content list at the given index.
     *
     * @param index location for adding the collection
     * @param child      child to insert
     * @return           the parent on which the method was called
     * @throws IndexOutOfBoundsException if index is negative or beyond
     *         the current number of children
     * @throws IllegalAddException if the given child already has a parent.
     */
    public Document addContent(int index, Content child) {
        content.add(index, child);
        return this;
    }

    /**
     * Inserts the content in a collection into the content list
     * at the given index.  In event of an exception the original content
     * will be unchanged and the objects in the supplied collection will be
     * unaltered.
     *
     * @param index location for adding the collection
     * @param c  collection to insert
     * @return            the parent on which the method was called
     * @throws IndexOutOfBoundsException if index is negative or beyond
     *         the current number of children
     * @throws IllegalAddException if any item in the collection
     *         already has a parent or is of an illegal type.
     */
    public Document addContent(int index, Collection c) {
        content.addAll(index, c);
        return this;
    }

    public List cloneContent() {
        int size = getContentSize();
        List list = new ArrayList(size);
        for (int i = 0; i < size; i++) {
            Content child = getContent(i);
            list.add(child.clone());
        }
        return list;
    }

    public Content getContent(int index) {
        return (Content) content.get(index);