239 lines
7.8 KiB
239 lines
7.8 KiB
/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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*/
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* $Id: AttributesImplSerializer.java,v 1.2.4.1 2005/09/15 08:15:14 suresh_emailid Exp $
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*/
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package com.sun.org.apache.xml.internal.serializer;
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import java.util.HashMap;
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import java.util.Map;
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import org.xml.sax.Attributes;
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import org.xml.sax.helpers.AttributesImpl;
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/**
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* This class extends org.xml.sax.helpers.AttributesImpl which implements org.
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* xml.sax.Attributes. But for optimization this class adds a Map for
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* faster lookup of an index by qName, which is commonly done in the stream
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* serializer.
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*
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* @see org.xml.sax.Attributes
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*
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* @xsl.usage internal
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*/
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public final class AttributesImplSerializer extends AttributesImpl
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{
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/**
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* Hash table of qName/index values to quickly lookup the index
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* of an attributes qName. qNames are in uppercase in the hash table
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* to make the search case insensitive.
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*
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* The keys to the hashtable to find the index are either
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* "prefix:localName" or "{uri}localName".
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*/
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private final Map<String, Integer> m_indexFromQName = new HashMap<>();
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private final StringBuffer m_buff = new StringBuffer();
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/**
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* This is the number of attributes before switching to the hash table,
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* and can be tuned, but 12 seems good for now - Brian M.
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*/
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private static final int MAX = 12;
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/**
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* One less than the number of attributes before switching to
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* the Map.
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*/
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private static final int MAXMinus1 = MAX - 1;
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/**
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* This method gets the index of an attribute given its qName.
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* @param qname the qualified name of the attribute, e.g. "prefix1:locName1"
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* @return the integer index of the attribute.
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* @see org.xml.sax.Attributes#getIndex(String)
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*/
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public final int getIndex(String qname)
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{
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int index;
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if (super.getLength() < MAX)
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{
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// if we haven't got too many attributes let the
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// super class look it up
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index = super.getIndex(qname);
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return index;
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}
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// we have too many attributes and the super class is slow
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// so find it quickly using our Map.
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Integer i = m_indexFromQName.get(qname);
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if (i == null)
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index = -1;
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else
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index = i.intValue();
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return index;
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}
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/**
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* This method adds the attribute, but also records its qName/index pair in
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* the hashtable for fast lookup by getIndex(qName).
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* @param uri the URI of the attribute
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* @param local the local name of the attribute
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* @param qname the qualified name of the attribute
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* @param type the type of the attribute
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* @param val the value of the attribute
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*
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* @see org.xml.sax.helpers.AttributesImpl#addAttribute(String, String, String, String, String)
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* @see #getIndex(String)
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*/
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public final void addAttribute(
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String uri,
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String local,
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String qname,
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String type,
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String val)
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{
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int index = super.getLength();
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super.addAttribute(uri, local, qname, type, val);
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// (index + 1) is now the number of attributes
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// so either compare (index+1) to MAX, or compare index to (MAX-1)
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if (index < MAXMinus1)
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{
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return;
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}
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else if (index == MAXMinus1)
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{
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switchOverToHash(MAX);
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}
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else
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{
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/* add the key with the format of "prefix:localName" */
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/* we have just added the attibute, its index is the old length */
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Integer i = index;
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m_indexFromQName.put(qname, i);
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/* now add with key of the format "{uri}localName" */
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m_buff.setLength(0);
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m_buff.append('{').append(uri).append('}').append(local);
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String key = m_buff.toString();
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m_indexFromQName.put(key, i);
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}
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}
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/**
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* We are switching over to having a hash table for quick look
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* up of attributes, but up until now we haven't kept any
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* information in the Map, so we now update the Map.
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* Future additional attributes will update the Map as
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* they are added.
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* @param numAtts
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*/
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private void switchOverToHash(int numAtts)
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{
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for (int index = 0; index < numAtts; index++)
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{
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String qName = super.getQName(index);
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Integer i = index;
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m_indexFromQName.put(qName, i);
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// Add quick look-up to find with uri/local name pair
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String uri = super.getURI(index);
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String local = super.getLocalName(index);
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m_buff.setLength(0);
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m_buff.append('{').append(uri).append('}').append(local);
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String key = m_buff.toString();
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m_indexFromQName.put(key, i);
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}
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}
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/**
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* This method clears the accumulated attributes.
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*
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* @see org.xml.sax.helpers.AttributesImpl#clear()
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*/
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public final void clear()
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{
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int len = super.getLength();
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super.clear();
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if (MAX <= len)
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{
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// if we have had enough attributes and are
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// using the Map, then clear the Map too.
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m_indexFromQName.clear();
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}
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}
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/**
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* This method sets the attributes, previous attributes are cleared,
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* it also keeps the hashtable up to date for quick lookup via
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* getIndex(qName).
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* @param atts the attributes to copy into these attributes.
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* @see org.xml.sax.helpers.AttributesImpl#setAttributes(Attributes)
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* @see #getIndex(String)
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*/
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public final void setAttributes(Attributes atts)
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{
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super.setAttributes(atts);
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// we've let the super class add the attributes, but
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// we need to keep the hash table up to date ourselves for the
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// potentially new qName/index pairs for quick lookup.
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int numAtts = atts.getLength();
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if (MAX <= numAtts)
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switchOverToHash(numAtts);
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}
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/**
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* This method gets the index of an attribute given its uri and locanName.
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* @param uri the URI of the attribute name.
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* @param localName the local namer (after the ':' ) of the attribute name.
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* @return the integer index of the attribute.
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* @see org.xml.sax.Attributes#getIndex(String)
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*/
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public final int getIndex(String uri, String localName)
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{
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int index;
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if (super.getLength() < MAX)
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{
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// if we haven't got too many attributes let the
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// super class look it up
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index = super.getIndex(uri,localName);
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return index;
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}
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// we have too many attributes and the super class is slow
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// so find it quickly using our Map.
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// Form the key of format "{uri}localName"
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m_buff.setLength(0);
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m_buff.append('{').append(uri).append('}').append(localName);
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String key = m_buff.toString();
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Integer i = m_indexFromQName.get(key);
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if (i == null)
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index = -1;
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else
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index = i;
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return index;
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}
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}
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