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package org.glassfish.jersey.message.internal;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import jersey.repackaged.com.google.common.base.Predicate;
import jersey.repackaged.com.google.common.collect.Maps;
/**
* Common media types and functionality.
*
* @author Paul Sandoz
* @author Marek Potociar (marek.potociar at oracle.com)
*/
public final class MediaTypes {
/**
* WADL Media type.
*/
public static final MediaType WADL_TYPE = MediaType.valueOf("application/vnd.sun.wadl+xml");
/**
* A comparator for media types, that implements the "partial order" defined in the resource matching algorithm
* section of the JAX-RS specification, except that this comparator is "inverted" so that it allows for natural
* sorting in Java collections, where "lower" values are put to the front of a collection.
*
* IOW, when used to sort a collection, the resulting collection can be iterated in a way that the more specific
* media types are preferred over the less specific ones:
*
*
* m/n < m/* < */*
*
* The actual media type values are ignored, i.e. the different media types are considered equal if they are
* comparably specific:
*
*
* compare(m/n, x/y) == 0
* compare(m/*, x/*) == 0
*/
public static final Comparator PARTIAL_ORDER_COMPARATOR = new Comparator() {
private int rank(final MediaType type) {
// "m/n" = 0; "m/*" = 1; "*/*" = 3; ...also "*/n" = 2, but that's just nonsense...
return ((type.isWildcardType() ? 1 : 0) << 1) | (type.isWildcardSubtype() ? 1 : 0);
}
@Override
public int compare(MediaType typeA, MediaType typeB) {
return rank(typeA) - rank(typeB);
}
};
/**
* Comparator for lists of media types.
*
* The least specific content type of each list is obtained and then compared
* using {@link #PARTIAL_ORDER_COMPARATOR}.
*
* Assumes each list is already ordered according to {@link #PARTIAL_ORDER_COMPARATOR}
* and therefore the least specific media type is at the end of the list.
*/
public static final Comparator> MEDIA_TYPE_LIST_COMPARATOR =
new Comparator>() {
@Override
public int compare(List o1, List o2) {
return PARTIAL_ORDER_COMPARATOR.compare(getLeastSpecific(o1), getLeastSpecific(o2));
}
private MediaType getLeastSpecific(List l) {
// FIXME: really comparing just last one?
return l.get(l.size() - 1);
}
};
/**
* A singleton list containing the wildcard media type.
*/
public static final List WILDCARD_TYPE_SINGLETON_LIST =
Collections.singletonList(MediaType.WILDCARD_TYPE);
/**
* An acceptable media type corresponding to a wildcard type.
*/
public static final AcceptableMediaType WILDCARD_ACCEPTABLE_TYPE = new AcceptableMediaType("*", "*");
/**
* An acceptable media type corresponding to a wildcard type.
*/
public static final QualitySourceMediaType WILDCARD_QS_TYPE = new QualitySourceMediaType("*", "*");
/**
* A singleton list containing the wildcard media type.
*/
public static final List WILDCARD_QS_TYPE_SINGLETON_LIST =
Collections.singletonList(WILDCARD_QS_TYPE);
/**
* Cache containing frequently requested media type values with a wildcard subtype.
*/
private static final Map WILDCARD_SUBTYPE_CACHE = new HashMap() {
private static final long serialVersionUID = 3109256773218160485L;
{
put("application", new MediaType("application", MediaType.MEDIA_TYPE_WILDCARD));
put("multipart", new MediaType("multipart", MediaType.MEDIA_TYPE_WILDCARD));
put("text", new MediaType("text", MediaType.MEDIA_TYPE_WILDCARD));
}
};
/**
* Predicate for constructing filtering parameter maps that ignore the "q" and "qs" parameters.
*/
private static final Predicate QUALITY_PARAM_FILTERING_PREDICATE = new Predicate() {
@Override
public boolean apply(String input) {
return !Quality.QUALITY_SOURCE_PARAMETER_NAME.equals(input)
&& !Quality.QUALITY_PARAMETER_NAME.equals(input);
}
};
/**
* Prevents initialization.
*/
private MediaTypes() {
throw new AssertionError("Instantiation not allowed.");
}
/**
* Determine if the two media types are type-equal (their {@link MediaType#getType() type}
* and {@link MediaType#getSubtype() subtype} are equal). For example:
*
* m/n == m/n
* m/n;p1 == m/n;p2
*
* m/n != m/y
* m/n != x/n
* m/n != x/y
*
* @param m1 first media type.
* @param m2 second media type.
* @return {@code true} if the two media types are of the same type and subtype,
* {@code false} otherwise.
*/
public static boolean typeEqual(MediaType m1, MediaType m2) {
if (m1 == null || m2 == null) {
return false;
}
return m1.getSubtype().equalsIgnoreCase(m2.getSubtype()) && m1.getType().equalsIgnoreCase(m2.getType());
}
/**
* Determine if the two list of media types share a common
* {@link #typeEqual(javax.ws.rs.core.MediaType, javax.ws.rs.core.MediaType) type-equal}
* sub-list.
*
* @param ml1 first media type list.
* @param ml2 second media type list.
* @return {@code true} if the two media type lists intersect by sharing a
* common type-equal sub-list, {@code false} otherwise.
*/
public static boolean intersect(List ml1, List ml2) {
for (MediaType m1 : ml1) {
for (MediaType m2 : ml2) {
if (MediaTypes.typeEqual(m1, m2)) {
return true;
}
}
}
return false;
}
/**
* Get the most specific media type from a pair of media types. The most
* specific media type is the media type from the pair that has least
* wild cards present, or has more parameters specified.
*
* @param m1 the first media type.
* @param m2 the second media type.
* @return the most specific media type. If the media types are equally
* specific then the first media type is returned.
*/
public static MediaType mostSpecific(MediaType m1, MediaType m2) {
if (m1.isWildcardType() && !m2.isWildcardType()) {
return m2;
}
if (m1.isWildcardSubtype() && !m2.isWildcardSubtype()) {
return m2;
}
if (m2.getParameters().size() > m1.getParameters().size()) {
return m2;
}
return m1;
}
/**
* Create an unmodifiable list of media types from the values declared in the {@link Consumes}
* annotation.
*
* @param annotation the Consumes annotation.
* @return the list of {@link MediaType}, ordered according to {@link #PARTIAL_ORDER_COMPARATOR}.
*/
public static List createFrom(Consumes annotation) {
if (annotation == null) {
return WILDCARD_TYPE_SINGLETON_LIST;
}
return createFrom(annotation.value());
}
/**
* Create an unmodifiable list of media types from the values declared in the {@link Produces}
* annotation.
*
* @param annotation the Produces annotation.
* @return the list of {@link MediaType}, ordered according to {@link #PARTIAL_ORDER_COMPARATOR}.
*/
public static List createFrom(Produces annotation) {
if (annotation == null) {
return WILDCARD_TYPE_SINGLETON_LIST;
}
return createFrom(annotation.value());
}
/**
* Create an unmodifiable list of media type from a string array of media types.
*
* @param mediaTypes the string array of media types.
* @return the list of {@link MediaType}, ordered according to {@link #PARTIAL_ORDER_COMPARATOR}.
*/
public static List createFrom(String[] mediaTypes) {
List result = new ArrayList();
try {
for (String mediaType : mediaTypes) {
HttpHeaderReader.readMediaTypes(result, mediaType);
}
} catch (ParseException ex) {
throw new IllegalArgumentException(ex);
}
Collections.sort(result, PARTIAL_ORDER_COMPARATOR);
return Collections.unmodifiableList(result);
}
/**
* Create a list of quality source media type from the Produces annotation.
*
*
* @param mime the Produces annotation.
* @return the list of {@link QualitySourceMediaType}, ordered according to
* {@link org.glassfish.jersey.message.internal.QualitySourceMediaType#COMPARATOR}.
*/
public static List createQualitySourceMediaTypes(Produces mime) {
if (mime == null || mime.value().length == 0) {
return WILDCARD_QS_TYPE_SINGLETON_LIST;
}
return new ArrayList(createQualitySourceMediaTypes(mime.value()));
}
/**
* Create a list of quality source media type from an array of media types.
*
*
* @param mediaTypes the array of media types.
* @return the list of {@link QualitySourceMediaType}, ordered according to
* the quality source as the primary key and {@link #PARTIAL_ORDER_COMPARATOR}
* as the secondary key.
*/
public static List createQualitySourceMediaTypes(String[] mediaTypes) {
try {
return HttpHeaderReader.readQualitySourceMediaType(mediaTypes);
} catch (ParseException ex) {
throw new IllegalArgumentException(ex);
}
}
/**
* Reads quality factor from given media type.
*
* @param mt media type to read quality parameter from
* @return quality factor of input media type
*/
public static int getQuality(MediaType mt) {
final String qParam = mt.getParameters().get(Quality.QUALITY_PARAMETER_NAME);
return readQualityFactor(qParam);
}
private static int readQualityFactor(final String qParam) throws IllegalArgumentException {
if (qParam == null) {
return Quality.DEFAULT;
} else {
try {
return HttpHeaderReader.readQualityFactor(qParam);
} catch (ParseException ex) {
throw new IllegalArgumentException(ex);
}
}
}
/**
* Strips any quality parameters, i.e. q and qs from given media type.
*
* @param mediaType type to strip quality parameters from
* @return media type instance corresponding to the given one with quality parameters stripped off
* or the original instance if no such parameters are present
*/
public static MediaType stripQualityParams(MediaType mediaType) {
final Map oldParameters = mediaType.getParameters();
if (oldParameters.isEmpty()
|| (!oldParameters.containsKey(Quality.QUALITY_SOURCE_PARAMETER_NAME)
&& !oldParameters.containsKey(Quality.QUALITY_PARAMETER_NAME))) {
return mediaType;
}
return new MediaType(mediaType.getType(), mediaType.getSubtype(),
Maps.filterKeys(oldParameters, QUALITY_PARAM_FILTERING_PREDICATE));
}
/**
* Returns MediaType with wildcard in subtype.
*
* @param mediaType original MediaType.
* @return MediaType with wildcard in subtype.
*/
public static MediaType getTypeWildCart(MediaType mediaType) {
MediaType mt = WILDCARD_SUBTYPE_CACHE.get(mediaType.getType());
if (mt == null) {
mt = new MediaType(mediaType.getType(), MediaType.MEDIA_TYPE_WILDCARD);
}
return mt;
}
/**
* Convert media types into {@link java.lang.String}. The result string contains
* media types in the same order, separated by comma ',' and enclosed into quotes.
* For example for input media types
* {@link MediaType#TEXT_PLAIN_TYPE}, {@link MediaType#TEXT_PLAIN_TYPE} and
* {@link MediaType#APPLICATION_JSON_TYPE} the result will be
* "text/plain", "application/json", "text/html".
*
* @param mediaTypes {@link Iterable iterable} with {@link MediaType media types}.
* @return Media types converted into String.
*/
public static String convertToString(Iterable mediaTypes) {
StringBuilder sb = new StringBuilder();
boolean isFirst = true;
for (MediaType mediaType : mediaTypes) {
if (!isFirst) {
sb.append(", ");
} else {
isFirst = false;
}
sb.append("\"").append(mediaType.toString()).append("\"");
}
return sb.toString();
}
/**
* Check if the given media type is a wildcard type.
*
* A media type is considered to be a wildcard if either the media type's type or subtype is a wildcard type.
*
* @param mediaType media type.
* @return {@code true} if the media type is a wildcard type, {@code false} otherwise.
*/
public static boolean isWildcard(final MediaType mediaType) {
return mediaType.isWildcardType() || mediaType.isWildcardSubtype();
}
}