xmlattributesimpl.java

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/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2000-2002 The Apache Software Foundation.  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
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 *    the documentation and/or other materials provided with the
 *    distribution.
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 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 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 Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package com.sun.org.apache.xerces.internal.util;

import com.sun.xml.internal.stream.XMLBufferListener;
import com.sun.org.apache.xerces.internal.xni.Augmentations;
import com.sun.org.apache.xerces.internal.xni.QName;
import com.sun.org.apache.xerces.internal.xni.XMLAttributes;
import com.sun.org.apache.xerces.internal.xni.XMLString;
/**
 * The XMLAttributesImpl class is an implementation of the XMLAttributes
 * interface which defines a collection of attributes for an element. 
 * In the parser, the document source would scan the entire start element 
 * and collect the attributes. The attributes are communicated to the
 * document handler in the startElement method.
 * <p>
 * The attributes are read-write so that subsequent stages in the document
 * pipeline can modify the values or change the attributes that are
 * propogated to the next stage.
 *
 * @see com.sun.org.apache.xerces.internal.xni.XMLDocumentHandler#startElement
 *
 * @author Andy Clark, IBM 
 * @author Elena Litani, IBM
 * @author Michael Glavassevich, IBM
 *
 * @version $Id: XMLAttributesImpl.java,v 1.3 2005/09/26 13:03:01 sunithareddy Exp $
 */
public class XMLAttributesImpl
implements XMLAttributes, XMLBufferListener {

    //
    // Constants
    //
    
    /** Default table size. */
    protected static final int TABLE_SIZE = 101;
    
    /** 
     * Threshold at which an instance is treated
     * as a large attribute list.
     */
    protected static final int SIZE_LIMIT = 20;
    
    //
    // Data
    //

    // features

    /** Namespaces. */
    protected boolean fNamespaces = true;

    // data

    /** 
     * Usage count for the attribute table view. 
     * Incremented each time all attributes are removed
     * when the attribute table view is in use.
     */
    protected int fLargeCount = 1;
    
    /** Attribute count. */
    protected int fLength;

    /** Attribute information. */
    protected Attribute[] fAttributes = new Attribute[4];

    /** 
     * Hashtable of attribute information. 
     * Provides an alternate view of the attribute specification. 
     */
    protected Attribute[] fAttributeTableView;
    
    /**
     * Tracks whether each chain in the hash table is stale
     * with respect to the current state of this object.
     * A chain is stale if its state is not the same as the number
     * of times the attribute table view has been used.
     */
    protected int[] fAttributeTableViewChainState;
    
    /**
     * Actual number of buckets in the table view.
     */
    protected int fTableViewBuckets;
    
    /**
     * Indicates whether the table view contains consistent data.
     */
    protected boolean fIsTableViewConsistent;

    //
    // Constructors
    //

    /** Default constructor. */
    public XMLAttributesImpl() {
        this(TABLE_SIZE);
    }
    
    /**
     * @param tableSize initial size of table view
     */
    public XMLAttributesImpl(int tableSize) {
        fTableViewBuckets = tableSize;
        for (int i = 0; i < fAttributes.length; i++) {
            fAttributes[i] = new Attribute();
        }
    } // <init>()

    //
    // Public methods
    //

    /** 
     * Sets whether namespace processing is being performed. This state
     * is needed to return the correct value from the getLocalName method.
     *
     * @param namespaces True if namespace processing is turned on.
     *
     * @see #getLocalName
     */
    public void setNamespaces(boolean namespaces) {
        fNamespaces = namespaces;
    } // setNamespaces(boolean)

    //
    // XMLAttributes methods
    //

    /**
     * Adds an attribute. The attribute's non-normalized value of the
     * attribute will have the same value as the attribute value until
     * set using the <code>setNonNormalizedValue</code> method. Also,
     * the added attribute will be marked as specified in the XML instance
     * document unless set otherwise using the <code>setSpecified</code>
     * method.
     * <p>
     * <strong>Note:</strong> If an attribute of the same name already
     * exists, the old values for the attribute are replaced by the new
     * values.
     * 
     * @param name  The attribute name.
     * @param type  The attribute type. The type name is determined by
     *                  the type specified for this attribute in the DTD.
     *                  For example: "CDATA", "ID", "NMTOKEN", etc. However,
     *                  attributes of type enumeration will have the type
     *                  value specified as the pipe ('|') separated list of
     *                  the enumeration values prefixed by an open 
     *                  parenthesis and suffixed by a close parenthesis.
     *                  For example: "(true|false)".
     * @param value The attribute value.
     * 
     * @return Returns the attribute index.
     *
     * @see #setNonNormalizedValue
     * @see #setSpecified
     */
    public int addAttribute(QName name, String type, String value) {
      return addAttribute(name,type,value,null);
    }
    public int addAttribute(QName name, String type, String value,XMLString valueCache) {

        int index;
        if (fLength < SIZE_LIMIT) {
            index = name.uri != null && !name.uri.equals("") 
                ? getIndexFast(name.uri, name.localpart)
                : getIndexFast(name.rawname);
    
            if (index == -1) {
                index = fLength;
                if (fLength++ == fAttributes.length) {
                    Attribute[] attributes = new Attribute[fAttributes.length + 4];
                    System.arraycopy(fAttributes, 0, attributes, 0, fAttributes.length);
                    for (int i = fAttributes.length; i < attributes.length; i++) {
                        attributes[i] = new Attribute();
                    }
                    fAttributes = attributes;
                }
            }
        }
        else if (name.uri == null || 
            name.uri.length() == 0 || 
            (index = getIndexFast(name.uri, name.localpart)) == -1) {
            
            /**
             * If attributes were removed from the list after the table
             * becomes in use this isn't reflected in the table view. It's
             * assumed that once a user starts removing attributes they're 
             * not likely to add more. We only make the view consistent if
             * the user of this class adds attributes, removes them, and
             * then adds more.
             */
            if (!fIsTableViewConsistent || fLength == SIZE_LIMIT) {
                prepareAndPopulateTableView();
                fIsTableViewConsistent = true;
            }

            int bucket = getTableViewBucket(name.rawname); 
        
            // The chain is stale. 
            // This must be a unique attribute.
            if (fAttributeTableViewChainState[bucket] != fLargeCount) {
                index = fLength;
                if (fLength++ == fAttributes.length) {
                    Attribute[] attributes = new Attribute[fAttributes.length << 1];
                    System.arraycopy(fAttributes, 0, attributes, 0, fAttributes.length);
                    for (int i = fAttributes.length; i < attributes.length; i++) {
                        attributes[i] = new Attribute();
                    }
                    fAttributes = attributes;
                }
            
                // Update table view.
                fAttributeTableViewChainState[bucket] = fLargeCount;
                fAttributes[index].next = null;
                fAttributeTableView[bucket] = fAttributes[index];
            }
            // This chain is active. 
            // We need to check if any of the attributes has the same rawname.
            else {
                // Search the table.
                Attribute found = fAttributeTableView[bucket];
                while (found != null) {
                    if (found.name.rawname == name.rawname) {
                        break;
                    }
                    found = found.next;
                }
                // This attribute is unique.
                if (found == null) {
                    index = fLength;
                    if (fLength++ == fAttributes.length) {
                        Attribute[] attributes = new Attribute[fAttributes.length << 1];
                        System.arraycopy(fAttributes, 0, attributes, 0, fAttributes.length);
                        for (int i = fAttributes.length; i < attributes.length; i++) {
                            attributes[i] = new Attribute();
                        }
                        fAttributes = attributes;
                    }
                 
                    // Update table view
                    fAttributes[index].next = fAttributeTableView[bucket];
                    fAttributeTableView[bucket] = fAttributes[index];
                }
                // Duplicate. We still need to find the index.
                else {
                    index = getIndexFast(name.rawname);
                }
            }
        }          

        // set values
        Attribute attribute = fAttributes[index];
        attribute.name.setValues(name);
        attribute.type = type;
        attribute.value = value;
        attribute.xmlValue = valueCache;
        attribute.nonNormalizedValue = value;
        attribute.specified = false;

        // clear augmentations
        if(attribute.augs != null)
            attribute.augs.removeAllItems();
        
        return index;

    } // addAttribute(QName,String,XMLString)

    /** 
     * Removes all of the attributes. This method will also remove all
     * entities associated to the attributes.
     */
    public void removeAllAttributes() {
        fLength = 0;
    } // removeAllAttributes()

    /**
     * Removes the attribute at the specified index.
     * <p>
     * <strong>Note:</strong> This operation changes the indexes of all
     * attributes following the attribute at the specified index.
     * 
     * @param attrIndex The attribute index.
     */
    public void removeAttributeAt(int attrIndex) {
        fIsTableViewConsistent = false;
        if (attrIndex < fLength - 1) {
            Attribute removedAttr = fAttributes[attrIndex];
            System.arraycopy(fAttributes, attrIndex + 1,
                             fAttributes, attrIndex, fLength - attrIndex - 1);
            // Make the discarded Attribute object available for re-use
            // by tucking it after the Attributes that are still in use
            fAttributes[fLength-1] = removedAttr;
        }
        fLength--;
    } // removeAttributeAt(int)

    /**
     * Sets the name of the attribute at the specified index.
     * 
     * @param attrIndex The attribute index.
     * @param attrName  The new attribute name.
     */
    public void setName(int attrIndex, QName attrName) {
        fAttributes[attrIndex].name.setValues(attrName);
    } // setName(int,QName)

    /**
     * Sets the fields in the given QName structure with the values
     * of the attribute name at the specified index.
     * 
     * @param attrIndex The attribute index.
     * @param attrName  The attribute name structure to fill in.
     */
    public void getName(int attrIndex, QName attrName) {
        attrName.setValues(fAttributes[attrIndex].name);
    } // getName(int,QName)

    /**
     * Sets the type of the attribute at the specified index.
     * 
     * @param attrIndex The attribute index.
     * @param attrType  The attribute type. The type name is determined by
     *                  the type specified for this attribute in the DTD.
     *                  For example: "CDATA", "ID", "NMTOKEN", etc. However,
     *                  attributes of type enumeration will have the type
     *                  value specified as the pipe ('|') separated list of
     *                  the enumeration values prefixed by an open 
     *                  parenthesis and suffixed by a close parenthesis.
     *                  For example: "(true|false)".
     */
    public void setType(int attrIndex, String attrType) {
        fAttributes[attrIndex].type = attrType;