1 /* 2 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.util; 27 28 import java.nio.ByteBuffer; 29 import java.nio.CharBuffer; 30 import java.nio.charset.Charset; 31 import java.nio.charset.CharsetDecoder; 32 import java.nio.charset.CharsetEncoder; 33 import java.nio.charset.CoderResult; 34 import java.nio.charset.CodingErrorAction; 35 import java.nio.charset.StandardCharsets; 36 import java.util.Objects; 37 38 /** 39 * A Charset implementation for reading PropertyResourceBundle, in order 40 * for loading properties files. This first tries to load the properties 41 * file with UTF-8 encoding). If it fails, then load the file with ISO-8859-1 42 */ 43 public class PropertyResourceBundleCharset extends Charset { 44 45 private boolean strictUTF8 = false; 46 PropertyResourceBundleCharset(boolean strictUTF8)47 public PropertyResourceBundleCharset(boolean strictUTF8) { 48 this(PropertyResourceBundleCharset.class.getCanonicalName(), null); 49 this.strictUTF8 = strictUTF8; 50 } 51 PropertyResourceBundleCharset(String canonicalName, String[] aliases)52 public PropertyResourceBundleCharset(String canonicalName, String[] aliases) { 53 super(canonicalName, aliases); 54 } 55 56 @Override contains(Charset cs)57 public boolean contains(Charset cs) { 58 return false; 59 } 60 61 @Override newDecoder()62 public CharsetDecoder newDecoder() { 63 return new PropertiesFileDecoder(this, 1.0f, 1.0f); 64 } 65 66 @Override newEncoder()67 public CharsetEncoder newEncoder() { 68 throw new UnsupportedOperationException("Encoding is not supported"); 69 } 70 71 private final class PropertiesFileDecoder extends CharsetDecoder { 72 73 private CharsetDecoder cdUTF_8 = StandardCharsets.UTF_8.newDecoder() 74 .onMalformedInput(CodingErrorAction.REPORT) 75 .onUnmappableCharacter(CodingErrorAction.REPORT); 76 private CharsetDecoder cdISO_8859_1 = null; 77 PropertiesFileDecoder(Charset cs, float averageCharsPerByte, float maxCharsPerByte)78 protected PropertiesFileDecoder(Charset cs, 79 float averageCharsPerByte, float maxCharsPerByte) { 80 super(cs, averageCharsPerByte, maxCharsPerByte); 81 } 82 decodeLoop(ByteBuffer in, CharBuffer out)83 protected CoderResult decodeLoop(ByteBuffer in, CharBuffer out) { 84 if (Objects.nonNull(cdISO_8859_1)) { 85 return cdISO_8859_1.decode(in, out, false); 86 } 87 in.mark(); 88 out.mark(); 89 90 CoderResult cr = cdUTF_8.decode(in, out, false); 91 if (cr.isUnderflow() || cr.isOverflow() || 92 PropertyResourceBundleCharset.this.strictUTF8) { 93 return cr; 94 } 95 96 // Invalid or unmappable UTF-8 sequence detected. 97 // Switching to the ISO 8859-1 decorder. 98 assert cr.isMalformed() || cr.isUnmappable(); 99 in.reset(); 100 out.reset(); 101 cdISO_8859_1 = StandardCharsets.ISO_8859_1.newDecoder(); 102 return cdISO_8859_1.decode(in, out, false); 103 } 104 } 105 } 106