Java tutorial
/* * Copyright (C) 2011 The Guava Authors * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.proofpoint.http.client; import com.google.common.annotations.Beta; import com.google.common.annotations.GwtCompatible; import com.google.common.base.Ascii; import com.google.common.base.CharMatcher; import com.google.common.base.Function; import com.google.common.base.Joiner; import com.google.common.base.Joiner.MapJoiner; import com.google.common.base.Objects; import com.google.common.base.Optional; import com.google.common.collect.ImmutableListMultimap; import com.google.common.collect.ImmutableMap; import com.google.common.collect.ImmutableMultiset; import com.google.common.collect.ImmutableSet; import com.google.common.collect.Iterables; import com.google.common.collect.Maps; import com.google.common.collect.Multimap; import com.google.common.collect.Multimaps; import javax.annotation.Nullable; import javax.annotation.concurrent.Immutable; import java.nio.charset.Charset; import java.nio.charset.IllegalCharsetNameException; import java.nio.charset.UnsupportedCharsetException; import java.util.Collection; import java.util.Map; import java.util.Map.Entry; import static com.google.common.base.CharMatcher.ASCII; import static com.google.common.base.CharMatcher.JAVA_ISO_CONTROL; import static com.google.common.base.Charsets.UTF_8; import static com.google.common.base.Preconditions.checkArgument; import static com.google.common.base.Preconditions.checkNotNull; import static com.google.common.base.Preconditions.checkState; // // todo drop this when Guava 12 is released // /** * Represents an <a href="http://en.wikipedia.org/wiki/Internet_media_type">Internet Media Type</a> * (also known as a MIME Type or Content Type). This class also supports the concept of media ranges * <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1">defined by HTTP/1.1</a>. * As such, the {@code *} character is treated as a wildcard and is used to represent any acceptable * type or subtype value. A media type may not have wildcard type with a declared subtype. The * {@code *} character has no special meaning as part of a parameter. All values for type, subtype, * parameter attributes or parameter values must be valid according to RFCs * <a href="http://www.ietf.org/rfc/rfc2045.txt">2045</a> and * <a href="http://www.ietf.org/rfc/rfc2046.txt">2046</a>. * <p/> * <p>All portions of the media type that are case-insensitive (type, subtype, parameter attributes) * are normalized to lowercase. The value of the {@code charset} parameter is normalized to * lowercase, but all others are left as-is. * <p/> * <p>Note that this specifically does <strong>not</strong> represent the value of the MIME * {@code Content-Type} header and as such has no support for header-specific considerations such as * line folding and comments. * <p/> * <p>For media types that take a charset the predefined constants default to UTF-8 and have a * "_UTF_8" suffix. To get a version without a character set, use {@link #withoutParameters}. * * @author Gregory Kick * @since 12.0 */ @Beta @GwtCompatible @Immutable final class MediaType { private static final String CHARSET_ATTRIBUTE = "charset"; private static final ImmutableListMultimap<String, String> UTF_8_CONSTANT_PARAMETERS = ImmutableListMultimap .of(CHARSET_ATTRIBUTE, Ascii.toLowerCase(UTF_8.name())); /** * Matcher for type, subtype and attributes. */ private static final CharMatcher TOKEN_MATCHER = ASCII.and(JAVA_ISO_CONTROL.negate()) .and(CharMatcher.isNot(' ')).and(CharMatcher.noneOf("()<>@,;:\\\"/[]?=")); private static final CharMatcher QUOTED_TEXT_MATCHER = ASCII.and(CharMatcher.noneOf("\"\\\r")); /* * This matches the same characters as linear-white-space from RFC 822, but we make no effort to * enforce any particular rules with regards to line folding as stated in the class docs. */ private static final CharMatcher LINEAR_WHITE_SPACE = CharMatcher.anyOf(" \t\r\n"); // TODO(gak): make these public? private static final String APPLICATION_TYPE = "application"; private static final String AUDIO_TYPE = "audio"; private static final String IMAGE_TYPE = "image"; private static final String TEXT_TYPE = "text"; private static final String VIDEO_TYPE = "video"; private static final String WILDCARD = "*"; /* * The following constants are grouped by their type and ordered alphabetically by the constant * name within that type. The constant name should be a sensible identifier that is closest to the * "common name" of the media. This is often, but not necessarily the same as the subtype. * * Be sure to declare all constants with the type and subtype in all lowercase. * * When adding constants, be sure to add an entry into the KNOWN_TYPES map. For types that * take a charset (e.g. all text/* types), default to UTF-8 and suffix with "_UTF_8". */ public static final MediaType ANY_TYPE = createConstant(WILDCARD, WILDCARD); public static final MediaType ANY_TEXT_TYPE = createConstant(TEXT_TYPE, WILDCARD); public static final MediaType ANY_IMAGE_TYPE = createConstant(IMAGE_TYPE, WILDCARD); public static final MediaType ANY_AUDIO_TYPE = createConstant(AUDIO_TYPE, WILDCARD); public static final MediaType ANY_VIDEO_TYPE = createConstant(VIDEO_TYPE, WILDCARD); public static final MediaType ANY_APPLICATION_TYPE = createConstant(APPLICATION_TYPE, WILDCARD); /* text types */ public static final MediaType CACHE_MANIFEST_UTF_8 = createConstantUtf8(TEXT_TYPE, "cache-manifest"); public static final MediaType CSS_UTF_8 = createConstantUtf8(TEXT_TYPE, "css"); public static final MediaType CSV_UTF_8 = createConstantUtf8(TEXT_TYPE, "csv"); public static final MediaType HTML_UTF_8 = createConstantUtf8(TEXT_TYPE, "html"); public static final MediaType I_CALENDAR_UTF_8 = createConstantUtf8(TEXT_TYPE, "calendar"); public static final MediaType PLAIN_TEXT_UTF_8 = createConstantUtf8(TEXT_TYPE, "plain"); /** * <a href="http://www.rfc-editor.org/rfc/rfc4329.txt">RFC 4329</a> declares * {link #JAVASCRIPT application/javascript} to be the correct media type for JavaScript, but this * may be necessary in certain situations for compatibility. */ public static final MediaType TEXT_JAVASCRIPT_UTF_8 = createConstantUtf8(TEXT_TYPE, "javascript"); public static final MediaType VCARD_UTF_8 = createConstantUtf8(TEXT_TYPE, "vcard"); public static final MediaType XML_UTF_8 = createConstantUtf8(TEXT_TYPE, "xml"); /* image types */ public static final MediaType GIF = createConstant(IMAGE_TYPE, "gif"); public static final MediaType ICO = createConstant(IMAGE_TYPE, "vnd.microsoft.icon"); public static final MediaType JPEG = createConstant(IMAGE_TYPE, "jpeg"); public static final MediaType PNG = createConstant(IMAGE_TYPE, "png"); public static final MediaType SVG_UTF_8 = createConstantUtf8(IMAGE_TYPE, "svg+xml"); public static final MediaType TIFF = createConstant(IMAGE_TYPE, "tiff"); /* audio types */ public static final MediaType MP4_AUDIO = createConstant(AUDIO_TYPE, "mp4"); public static final MediaType MPEG_AUDIO = createConstant(AUDIO_TYPE, "mpeg"); public static final MediaType OGG_AUDIO = createConstant(AUDIO_TYPE, "ogg"); public static final MediaType WEBM_AUDIO = createConstant(AUDIO_TYPE, "webm"); /* video types */ public static final MediaType MP4_VIDEO = createConstant(VIDEO_TYPE, "mp4"); public static final MediaType MPEG_VIDEO = createConstant(VIDEO_TYPE, "mpeg"); public static final MediaType OGG_VIDEO = createConstant(VIDEO_TYPE, "ogg"); public static final MediaType QUICKTIME = createConstant(VIDEO_TYPE, "quicktime"); public static final MediaType WEBM_VIDEO = createConstant(VIDEO_TYPE, "webm"); public static final MediaType WMV = createConstant(VIDEO_TYPE, "x-ms-wmv"); /* application types */ public static final MediaType ATOM_UTF_8 = createConstantUtf8(APPLICATION_TYPE, "atom+xml"); public static final MediaType BZIP2 = createConstant(APPLICATION_TYPE, "x-bzip2"); public static final MediaType FORM_DATA = createConstant(APPLICATION_TYPE, "x-www-form-urlencoded"); public static final MediaType GZIP = createConstant(APPLICATION_TYPE, "x-gzip"); /** * <a href="http://www.rfc-editor.org/rfc/rfc4329.txt">RFC 4329</a> declares this to be the * correct media type for JavaScript, but {@link #TEXT_JAVASCRIPT_UTF_8 text/javascript} may be * necessary in certain situations for compatibility. */ public static final MediaType JAVASCRIPT_UTF_8 = createConstantUtf8(APPLICATION_TYPE, "javascript"); public static final MediaType JSON_UTF_8 = createConstantUtf8(APPLICATION_TYPE, "json"); public static final MediaType KML = createConstant(APPLICATION_TYPE, "vnd.google-earth.kml+xml"); public static final MediaType KMZ = createConstant(APPLICATION_TYPE, "vnd.google-earth.kmz"); public static final MediaType MICROSOFT_EXCEL = createConstant(APPLICATION_TYPE, "vnd.ms-excel"); public static final MediaType MICROSOFT_POWERPOINT = createConstant(APPLICATION_TYPE, "vnd.ms-powerpoint"); public static final MediaType MICROSOFT_WORD = createConstant(APPLICATION_TYPE, "msword"); public static final MediaType OCTET_STREAM = createConstant(APPLICATION_TYPE, "octet-stream"); public static final MediaType OGG_CONTAINER = createConstant(APPLICATION_TYPE, "ogg"); public static final MediaType OOXML_DOCUMENT = createConstant(APPLICATION_TYPE, "vnd.openxmlformats-officedocument.wordprocessingml.document"); public static final MediaType OOXML_PRESENTATION = createConstant(APPLICATION_TYPE, "vnd.openxmlformats-officedocument.presentationml.presentation"); public static final MediaType OOXML_SHEET = createConstant(APPLICATION_TYPE, "vnd.openxmlformats-officedocument.spreadsheetml.sheet"); public static final MediaType OPENDOCUMENT_GRAPHICS = createConstant(APPLICATION_TYPE, "vnd.oasis.opendocument.graphics"); public static final MediaType OPENDOCUMENT_PRESENTATION = createConstant(APPLICATION_TYPE, "vnd.oasis.opendocument.presentation"); public static final MediaType OPENDOCUMENT_SPREADSHEET = createConstant(APPLICATION_TYPE, "vnd.oasis.opendocument.spreadsheet"); public static final MediaType OPENDOCUMENT_TEXT = createConstant(APPLICATION_TYPE, "vnd.oasis.opendocument.text"); public static final MediaType PDF = createConstant(APPLICATION_TYPE, "pdf"); public static final MediaType POSTSCRIPT = createConstant(APPLICATION_TYPE, "postscript"); public static final MediaType RTF_UTF_8 = createConstantUtf8(APPLICATION_TYPE, "rtf"); public static final MediaType SHOCKWAVE_FLASH = createConstant(APPLICATION_TYPE, "x-shockwave-flash"); public static final MediaType TAR = createConstant(APPLICATION_TYPE, "x-tar"); public static final MediaType XHTML_UTF_8 = createConstantUtf8(APPLICATION_TYPE, "xhtml+xml"); public static final MediaType ZIP = createConstant(APPLICATION_TYPE, "zip"); private static final ImmutableMap<MediaType, MediaType> KNOWN_TYPES = new ImmutableMap.Builder<MediaType, MediaType>() .put(ANY_TYPE, ANY_TYPE).put(ANY_TEXT_TYPE, ANY_TEXT_TYPE).put(ANY_IMAGE_TYPE, ANY_IMAGE_TYPE) .put(ANY_AUDIO_TYPE, ANY_AUDIO_TYPE).put(ANY_VIDEO_TYPE, ANY_VIDEO_TYPE) .put(ANY_APPLICATION_TYPE, ANY_APPLICATION_TYPE) /* text types */ .put(CACHE_MANIFEST_UTF_8, CACHE_MANIFEST_UTF_8).put(CSS_UTF_8, CSS_UTF_8).put(CSV_UTF_8, CSV_UTF_8) .put(HTML_UTF_8, HTML_UTF_8).put(I_CALENDAR_UTF_8, I_CALENDAR_UTF_8) .put(PLAIN_TEXT_UTF_8, PLAIN_TEXT_UTF_8).put(TEXT_JAVASCRIPT_UTF_8, TEXT_JAVASCRIPT_UTF_8) .put(VCARD_UTF_8, VCARD_UTF_8).put(XML_UTF_8, XML_UTF_8) /* image types */ .put(GIF, GIF).put(ICO, ICO).put(JPEG, JPEG).put(PNG, PNG).put(SVG_UTF_8, SVG_UTF_8).put(TIFF, TIFF) /* audio types */ .put(MP4_AUDIO, MP4_AUDIO).put(MPEG_AUDIO, MPEG_AUDIO).put(OGG_AUDIO, OGG_AUDIO) .put(WEBM_AUDIO, WEBM_AUDIO) /* video types */ .put(MP4_VIDEO, MP4_VIDEO).put(MPEG_VIDEO, MPEG_VIDEO).put(OGG_VIDEO, OGG_VIDEO) .put(QUICKTIME, QUICKTIME).put(WEBM_VIDEO, WEBM_VIDEO).put(WMV, WMV) /* application types */ .put(ATOM_UTF_8, ATOM_UTF_8).put(BZIP2, BZIP2).put(FORM_DATA, FORM_DATA).put(GZIP, GZIP) .put(JAVASCRIPT_UTF_8, JAVASCRIPT_UTF_8).put(JSON_UTF_8, JSON_UTF_8).put(KML, KML).put(KMZ, KMZ) .put(MICROSOFT_EXCEL, MICROSOFT_EXCEL).put(MICROSOFT_POWERPOINT, MICROSOFT_POWERPOINT) .put(MICROSOFT_WORD, MICROSOFT_WORD).put(OCTET_STREAM, OCTET_STREAM).put(OGG_CONTAINER, OGG_CONTAINER) .put(OOXML_DOCUMENT, OOXML_DOCUMENT).put(OOXML_PRESENTATION, OOXML_PRESENTATION) .put(OOXML_SHEET, OOXML_SHEET).put(OPENDOCUMENT_GRAPHICS, OPENDOCUMENT_GRAPHICS) .put(OPENDOCUMENT_PRESENTATION, OPENDOCUMENT_PRESENTATION) .put(OPENDOCUMENT_SPREADSHEET, OPENDOCUMENT_SPREADSHEET).put(OPENDOCUMENT_TEXT, OPENDOCUMENT_TEXT) .put(PDF, PDF).put(POSTSCRIPT, POSTSCRIPT).put(RTF_UTF_8, RTF_UTF_8) .put(SHOCKWAVE_FLASH, SHOCKWAVE_FLASH).put(TAR, TAR).put(XHTML_UTF_8, XHTML_UTF_8).put(ZIP, ZIP) .build(); private final String type; private final String subtype; private final ImmutableListMultimap<String, String> parameters; private MediaType(String type, String subtype, ImmutableListMultimap<String, String> parameters) { this.type = type; this.subtype = subtype; this.parameters = parameters; } private static MediaType createConstant(String type, String subtype) { return new MediaType(type, subtype, ImmutableListMultimap.<String, String>of()); } private static MediaType createConstantUtf8(String type, String subtype) { return new MediaType(type, subtype, UTF_8_CONSTANT_PARAMETERS); } /** * Returns the top-level media type. For example, {@code "text"} in {@code "text/plain"}. */ public String type() { return type; } /** * Returns the media subtype. For example, {@code "plain"} in {@code "text/plain"}. */ public String subtype() { return subtype; } /** * Returns a multimap containing the parameters of this media type. */ public ImmutableListMultimap<String, String> parameters() { return parameters; } private Map<String, ImmutableMultiset<String>> parametersAsMap() { return Maps.transformValues(parameters.asMap(), new Function<Collection<String>, ImmutableMultiset<String>>() { @Override public ImmutableMultiset<String> apply(Collection<String> input) { return ImmutableMultiset.copyOf(input); } }); } /** * Returns an optional charset for the value of the charset parameter if it is specified. * * @throws IllegalStateException if multiple charset values have been set for this media type * @throws IllegalCharsetNameException if a charset value is present, but illegal * @throws UnsupportedCharsetException if a charset value is present, but no support is available * in this instance of the Java virtual machine */ public Optional<Charset> charset() { ImmutableSet<String> charsetValues = ImmutableSet.copyOf(parameters.get(CHARSET_ATTRIBUTE)); switch (charsetValues.size()) { case 0: return Optional.absent(); case 1: return Optional.of(Charset.forName(Iterables.getOnlyElement(charsetValues))); default: throw new IllegalStateException("Multiple charset values defined: " + charsetValues); } } /** * Returns a new instance with the same type and subtype as this instance, but without any * parameters. */ public MediaType withoutParameters() { return parameters.isEmpty() ? this : create(type, subtype); } /** * <em>Replaces</em> all parameters with the given parameters. * * @throws IllegalArgumentException if any parameter or value is invalid */ public MediaType withParameters(Multimap<String, String> parameters) { return create(type, subtype, parameters); } /** * <em>Replaces</em> all parameters with the given attribute with a single parameter with the * given value. If multiple parameters with the same attributes are necessary use * {@link #withParameters}. Prefer {@link #withCharset} for setting the {@code charset} parameter * when using a {@link Charset} object. * * @throws IllegalArgumentException if either {@code attribute} or {@code value} is invalid */ public MediaType withParameter(String attribute, String value) { checkNotNull(attribute); checkNotNull(value); String normalizedAttribute = normalizeToken(attribute); ImmutableListMultimap.Builder<String, String> builder = ImmutableListMultimap.builder(); for (Entry<String, String> entry : parameters.entries()) { String key = entry.getKey(); if (!normalizedAttribute.equals(key)) { builder.put(key, entry.getValue()); } } builder.put(normalizedAttribute, normalizeParameterValue(normalizedAttribute, value)); MediaType mediaType = new MediaType(type, subtype, builder.build()); // Return one of the constants if the media type is a known type. return Objects.firstNonNull(KNOWN_TYPES.get(mediaType), mediaType); } /** * Returns a new instance with the same type and subtype as this instance, with the * {@code charset} parameter set to the {@link Charset#name name} of the given charset. Only one * {@code charset} parameter will be present on the new instance regardless of the number set on * this one. * <p/> * <p>If a charset must be specified that is not supported on this JVM (and thus is not * representable as a {@link Charset} instance, use {@link #withParameter}. */ public MediaType withCharset(Charset charset) { checkNotNull(charset); return withParameter(CHARSET_ATTRIBUTE, charset.name()); } /** * Returns true if either the type or subtype is the wildcard. */ public boolean hasWildcard() { return WILDCARD.equals(type) || WILDCARD.equals(subtype); } /** * Returns {@code true} if this instance falls within the range (as defined by * <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html">the HTTP Accept header</a>) * given by the argument according to three criteria: * <p/> * <ol> * <li>The type of the argument is the wildcard or equal to the type of this instance. * <li>The subtype of the argument is the wildcard or equal to the subtype of this instance. * <li>All of the parameters present in the argument are present in this instance. * </ol> * <p/> * For example: <pre> {@code * PLAIN_TEXT_UTF_8.is(PLAIN_TEXT_UTF_8) // true * PLAIN_TEXT_UTF_8.is(HTML_UTF_8) // false * PLAIN_TEXT_UTF_8.is(ANY_TYPE) // true * PLAIN_TEXT_UTF_8.is(ANY_TEXT_TYPE) // true * PLAIN_TEXT_UTF_8.is(ANY_IMAGE_TYPE) // false * PLAIN_TEXT_UTF_8.is(ANY_TEXT_TYPE.withCharset(UTF_8)) // true * PLAIN_TEXT_UTF_8.withoutParameters().is(ANY_TEXT_TYPE.withCharset(UTF_8)) // false * PLAIN_TEXT_UTF_8.is(ANY_TEXT_TYPE.withCharset(UTF_16)) // false}</pre> * <p/> * <p>Note that while it is possible to have the same parameter declared multiple times within a * media type this method does not consider the number of occurrences of a parameter. For * example, {@code "text/plain; charset=UTF-8"} satisfies * {@code "text/plain; charset=UTF-8; charset=UTF-8"}. */ public boolean is(MediaType mediaTypeRange) { return (mediaTypeRange.type.equals(WILDCARD) || mediaTypeRange.type.equals(this.type)) && (mediaTypeRange.subtype.equals(WILDCARD) || mediaTypeRange.subtype.equals(this.subtype)) && this.parameters.entries().containsAll(mediaTypeRange.parameters.entries()); } /** * Creates a new media type with the given type and subtype. * * @throws IllegalArgumentException if type or subtype is invalid or if a wildcard is used for the * type, but not the subtype. */ public static MediaType create(String type, String subtype) { return create(type, subtype, ImmutableListMultimap.<String, String>of()); } /** * Creates a media type with the "application" type and the given subtype. * * @throws IllegalArgumentException if subtype is invalid */ static MediaType createApplicationType(String subtype) { return create(APPLICATION_TYPE, subtype); } /** * Creates a media type with the "audio" type and the given subtype. * * @throws IllegalArgumentException if subtype is invalid */ static MediaType createAudioType(String subtype) { return create(AUDIO_TYPE, subtype); } /** * Creates a media type with the "image" type and the given subtype. * * @throws IllegalArgumentException if subtype is invalid */ static MediaType createImageType(String subtype) { return create(IMAGE_TYPE, subtype); } /** * Creates a media type with the "text" type and the given subtype. * * @throws IllegalArgumentException if subtype is invalid */ static MediaType createTextType(String subtype) { return create(TEXT_TYPE, subtype); } /** * Creates a media type with the "video" type and the given subtype. * * @throws IllegalArgumentException if subtype is invalid */ static MediaType createVideoType(String subtype) { return create(VIDEO_TYPE, subtype); } private static MediaType create(String type, String subtype, Multimap<String, String> parameters) { checkNotNull(type); checkNotNull(subtype); checkNotNull(parameters); String normalizedType = normalizeToken(type); String normalizedSubtype = normalizeToken(subtype); checkArgument(!WILDCARD.equals(normalizedType) || WILDCARD.equals(normalizedSubtype), "A wildcard type cannot be used with a non-wildcard subtype"); ImmutableListMultimap.Builder<String, String> builder = ImmutableListMultimap.builder(); for (Entry<String, String> entry : parameters.entries()) { String attribute = normalizeToken(entry.getKey()); builder.put(attribute, normalizeParameterValue(attribute, entry.getValue())); } MediaType mediaType = new MediaType(normalizedType, normalizedSubtype, builder.build()); // Return one of the constants if the media type is a known type. return Objects.firstNonNull(KNOWN_TYPES.get(mediaType), mediaType); } private static String normalizeToken(String token) { checkArgument(TOKEN_MATCHER.matchesAllOf(token)); return Ascii.toLowerCase(token); } private static String normalizeParameterValue(String attribute, String value) { return CHARSET_ATTRIBUTE.equals(attribute) ? Ascii.toLowerCase(value) : value; } /** * Parses a media type from its string representation. * * @throws IllegalArgumentException if the input is not parsable */ public static MediaType parse(String input) { checkNotNull(input); Tokenizer tokenizer = new Tokenizer(input); try { String type = tokenizer.consumeToken(TOKEN_MATCHER); tokenizer.consumeCharacter('/'); String subtype = tokenizer.consumeToken(TOKEN_MATCHER); ImmutableListMultimap.Builder<String, String> parameters = ImmutableListMultimap.builder(); while (tokenizer.hasMore()) { tokenizer.consumeCharacter(';'); tokenizer.consumeToken(LINEAR_WHITE_SPACE); String attribute = tokenizer.consumeToken(TOKEN_MATCHER); tokenizer.consumeCharacter('='); final String value; if ('"' == tokenizer.previewChar()) { tokenizer.consumeCharacter('"'); StringBuilder valueBuilder = new StringBuilder(); while ('"' != tokenizer.previewChar()) { if ('\\' == tokenizer.previewChar()) { tokenizer.consumeCharacter('\\'); valueBuilder.append(tokenizer.consumeCharacter(ASCII)); } else { valueBuilder.append(tokenizer.consumeToken(QUOTED_TEXT_MATCHER)); } } value = valueBuilder.toString(); tokenizer.consumeCharacter('"'); } else { value = tokenizer.consumeToken(TOKEN_MATCHER); } parameters.put(attribute, value); } return create(type, subtype, parameters.build()); } catch (IllegalStateException e) { throw new IllegalArgumentException(e); } } private static final class Tokenizer { final String input; int position = 0; Tokenizer(String input) { this.input = input; } String consumeToken(CharMatcher matcher) { checkState(hasMore()); int startPosition = position; position = matcher.negate().indexIn(input, startPosition); checkState(position != startPosition); return hasMore() ? input.substring(startPosition, position) : input.substring(startPosition); } char consumeCharacter(CharMatcher matcher) { checkState(hasMore()); char c = previewChar(); checkState(matcher.matches(c)); position++; return c; } char consumeCharacter(char c) { checkState(hasMore()); checkState(previewChar() == c); position++; return c; } char previewChar() { checkState(hasMore()); return input.charAt(position); } boolean hasMore() { return (position >= 0) && (position < input.length()); } } @Override public boolean equals(@Nullable Object obj) { if (obj == this) { return true; } else if (obj instanceof MediaType) { MediaType that = (MediaType) obj; return this.type.equals(that.type) && this.subtype.equals(that.subtype) // compare parameters regardless of order && this.parametersAsMap().equals(that.parametersAsMap()); } else { return false; } } @Override public int hashCode() { return Objects.hashCode(type, subtype, parametersAsMap()); } private static final MapJoiner PARAMETER_JOINER = Joiner.on("; ").withKeyValueSeparator("="); /** * Returns the string representation of this media type in the format described in <a * href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>. */ @Override public String toString() { StringBuilder builder = new StringBuilder().append(type).append('/').append(subtype); if (!parameters.isEmpty()) { builder.append("; "); Multimap<String, String> quotedParameters = Multimaps.transformValues(parameters, new Function<String, String>() { @Override public String apply(String value) { return TOKEN_MATCHER.matchesAllOf(value) ? value : escapeAndQuote(value); } }); PARAMETER_JOINER.appendTo(builder, quotedParameters.entries()); } return builder.toString(); } private static String escapeAndQuote(String value) { StringBuilder escaped = new StringBuilder(value.length() + 16).append('"'); for (char ch : value.toCharArray()) { if (ch == '\r' || ch == '\\' || ch == '"') { escaped.append('\\'); } escaped.append(ch); } return escaped.append('"').toString(); } }