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400 lines
11 KiB
Java
400 lines
11 KiB
Java
/*
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* #%L
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* Alfresco Data model classes
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* %%
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* Copyright (C) 2005 - 2016 Alfresco Software Limited
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* %%
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* This file is part of the Alfresco software.
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* If the software was purchased under a paid Alfresco license, the terms of
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* the paid license agreement will prevail. Otherwise, the software is
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* provided under the following open source license terms:
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*
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* Alfresco is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Alfresco is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
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* #L%
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*/
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package org.alfresco.util;
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import java.util.Collection;
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import org.alfresco.api.AlfrescoPublicApi;
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import org.alfresco.service.namespace.NamespaceException;
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import org.alfresco.service.namespace.NamespacePrefixResolver;
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import org.alfresco.service.namespace.NamespaceService;
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import org.alfresco.service.namespace.QName;
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import org.apache.xerces.util.XMLChar;
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/**
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* Support for the ISO 9075 encoding of XML element names.
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*
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* @author Andy Hind
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*/
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@AlfrescoPublicApi
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public class ISO9075
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{
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/*
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* Mask for hex encoding
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*/
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private static final int MASK = (1 << 4) - 1;
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/*
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* Digits used string encoding
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*/
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private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e',
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'f' };
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/**
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* Private constructor
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*
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*/
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private ISO9075()
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{
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super();
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}
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private static boolean isSQLNameStart(char c)
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{
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if('a' <= c && c <= 'z' )
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{
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return true;
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}
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else if('A' <= c && c <= 'Z' )
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{
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return true;
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}
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else if('_' == c)
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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private static boolean isSQLName(char c)
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{
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if(isSQLNameStart(c))
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{
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return true;
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}
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else if('0' <= c && c <= '9' )
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{
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return true;
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}
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else if(':' == c)
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{
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return true;
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}
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else if('$' == c)
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{
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return true;
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}
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else if('#' == c)
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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/**
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* Encodes a SQL identifier
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*
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* Allowed at the start: 'a'..'z' | 'A'..'Z' | '_'
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* Allowed after: 'a'..'z' | 'A'..'Z' | '0'..'9' | '_' | ':' | '$'| '#'
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*
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* @param toEncode String
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* @return String
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*/
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public static String encodeSQL(String toEncode)
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{
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if ((toEncode == null) || (toEncode.length() == 0))
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{
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return toEncode;
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}
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else
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{
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StringBuilder builder = new StringBuilder(toEncode.length());
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for (int i = 0; i < toEncode.length(); i++)
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{
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char c = toEncode.charAt(i);
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// First requires special test
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if (i == 0)
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{
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if (isSQLNameStart(c))
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{
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// The first character may be the _ at the start of an
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// encoding pattern
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if (matchesEncodedPattern(toEncode, i))
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{
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// Encode the first _
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encode('_', builder);
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}
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else
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{
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// Just append
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builder.append(c);
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}
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}
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else
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{
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// Encode an invalid start character for an XML element
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// name.
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encode(c, builder);
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}
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}
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else if (!isSQLName(c))
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{
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encode(c, builder);
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}
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else
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{
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if (matchesEncodedPattern(toEncode, i))
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{
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// '_' must be encoded
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encode('_', builder);
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}
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else
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{
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builder.append(c);
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}
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}
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}
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return builder.toString();
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}
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}
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/**
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* Encode a string according to ISO 9075
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*
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* @param toEncode String
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* @return String
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*/
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public static String encode(String toEncode)
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{
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if ((toEncode == null) || (toEncode.length() == 0))
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{
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return toEncode;
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}
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else if (XMLChar.isValidName(toEncode) && (toEncode.indexOf("_x") == -1) && (toEncode.indexOf(':') == -1))
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{
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return toEncode;
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}
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else
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{
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StringBuilder builder = new StringBuilder(toEncode.length());
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for (int i = 0; i < toEncode.length(); i++)
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{
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char c = toEncode.charAt(i);
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// First requires special test
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if (i == 0)
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{
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if (XMLChar.isNCNameStart(c))
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{
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// The first character may be the _ at the start of an
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// encoding pattern
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if (matchesEncodedPattern(toEncode, i))
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{
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// Encode the first _
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encode('_', builder);
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}
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else
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{
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// Just append
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builder.append(c);
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}
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}
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else
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{
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// Encode an invalid start character for an XML element
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// name.
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encode(c, builder);
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}
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}
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else if (!XMLChar.isNCName(c))
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{
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encode(c, builder);
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}
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else
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{
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if (matchesEncodedPattern(toEncode, i))
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{
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// '_' must be encoded
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encode('_', builder);
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}
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else
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{
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builder.append(c);
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}
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}
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}
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return builder.toString();
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}
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}
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private static boolean matchesEncodedPattern(String string, int position)
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{
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return (string.length() > position + 6)
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&& (string.charAt(position) == '_') && (string.charAt(position + 1) == 'x')
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&& isHexChar(string.charAt(position + 2)) && isHexChar(string.charAt(position + 3))
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&& isHexChar(string.charAt(position + 4)) && isHexChar(string.charAt(position + 5))
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&& (string.charAt(position + 6) == '_');
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}
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private static boolean isHexChar(char c)
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{
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switch (c)
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{
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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case 'a':
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case 'b':
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case 'c':
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case 'd':
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case 'e':
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case 'f':
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case 'A':
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case 'B':
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case 'C':
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case 'D':
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case 'E':
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case 'F':
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return true;
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default:
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return false;
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}
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}
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public static String decode(String toDecode)
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{
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if ((toDecode == null) || (toDecode.length() < 7) || (toDecode.indexOf("_x") < 0))
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{
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return toDecode;
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}
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StringBuffer decoded = new StringBuffer();
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for (int i = 0, l = toDecode.length(); i < l; i++)
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{
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if (matchesEncodedPattern(toDecode, i))
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{
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decoded.append(((char) Integer.parseInt(toDecode.substring(i + 2, i + 6), 16)));
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i += 6;// then one added for the loop to mkae the length of 7
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}
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else
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{
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decoded.append(toDecode.charAt(i));
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}
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}
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return decoded.toString();
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}
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private static void encode(char c, StringBuilder builder)
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{
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char[] buf = new char[] { '_', 'x', '0', '0', '0', '0', '_' };
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int charPos = 6;
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do
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{
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buf[--charPos] = DIGITS[c & MASK];
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c >>>= 4;
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}
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while (c != 0);
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builder.append(buf);
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}
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public static String getXPathName(QName qName, NamespacePrefixResolver nspr)
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{
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Collection<String> prefixes = nspr.getPrefixes(qName.getNamespaceURI());
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if (prefixes.size() == 0)
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{
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throw new NamespaceException("A namespace prefix is not registered for uri " + qName.getNamespaceURI());
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}
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String prefix = prefixes.iterator().next();
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if (prefix.equals(NamespaceService.DEFAULT_PREFIX))
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{
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return ISO9075.encode(qName.getLocalName());
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}
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else
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{
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return prefix + ":" + ISO9075.encode(qName.getLocalName());
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}
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}
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public static String getXPathName(QName qName)
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{
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return "{" + qName.getNamespaceURI() + "}" + ISO9075.encode(qName.getLocalName());
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}
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public static QName parseXPathName(String str)
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{
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if(!str.startsWith("{"))
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{
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throw new IllegalArgumentException("Invalid xpath string " + str);
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}
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int idx = str.indexOf("}");
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if(idx == -1)
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{
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throw new IllegalArgumentException("Invalid xpath string " + str);
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}
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String namespaceURI = str.substring(1, idx); // skip opening brace
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String localName = str.substring(idx+1);
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return QName.createQName(namespaceURI, localName);
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}
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/**
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* @param toLowerCaseEncoded String
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* @return Object
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*/
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public static Object lowerCaseEncodedSQL(String toLowerCaseEncoded)
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{
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String lowerCased = toLowerCaseEncoded.toLowerCase();
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StringBuilder builder = new StringBuilder(toLowerCaseEncoded.length());
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for (int i = 0; i < toLowerCaseEncoded.length(); i++)
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{
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if (matchesEncodedPattern(toLowerCaseEncoded, i))
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{
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for(int j = 0; j < 7; j++)
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{
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builder.append(lowerCased.charAt(i+j));
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}
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i += 6;
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}
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else
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{
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builder.append(toLowerCaseEncoded.charAt(i));
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}
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}
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return builder.toString();
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}
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}
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