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*
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*
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* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* http://glassfish.java.net/public/CDDL+GPL_1_1.html
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*
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package com.sun.jersey.server.impl;
import com.sun.jersey.core.header.AcceptableLanguageTag;
import com.sun.jersey.core.header.AcceptableMediaType;
import com.sun.jersey.core.header.AcceptableToken;
import com.sun.jersey.core.header.QualityFactor;
import com.sun.jersey.core.header.QualitySourceMediaType;
import com.sun.jersey.server.impl.model.HttpHelper;
import com.sun.jersey.spi.container.ContainerRequest;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Variant;
/**
*
* @author [email protected]
*/
public final class VariantSelector {
private VariantSelector() { }
/**
* Interface to get a dimension value from a variant and check if an
* acceptable dimension value is compatible with a dimension value.
*
* @param T the acceptable dimension value type
* @param U the dimension value type
*/
private static interface DimensionChecker {
/**
* Get the dimension value from the variant
*
* @param v the variant
* @return the dimension value
*/
U getDimension(VariantHolder v);
/**
* Get the quality source of the dimension
*
* @return
*/
int getQualitySource(VariantHolder v, U u);
/**
* Ascertain if the acceptable dimension value is compatible with
* the dimension value
*
* @param t the acceptable dimension value
* @param u the dimension value
* @return true if the acceptable dimension value is compatible with
* the dimension value
*/
boolean isCompatible(T t, U u);
String getVaryHeaderValue();
}
private static final DimensionChecker MEDIA_TYPE_DC =
new DimensionChecker() {
public MediaType getDimension(VariantHolder v) {
return v.v.getMediaType();
}
public boolean isCompatible(AcceptableMediaType t, MediaType u) {
return t.isCompatible(u);
}
public int getQualitySource(VariantHolder v, MediaType u) {
return v.mediaTypeQs;
}
public String getVaryHeaderValue() {
return HttpHeaders.ACCEPT;
}
};
private static final DimensionChecker LANGUAGE_TAG_DC =
new DimensionChecker() {
public Locale getDimension(VariantHolder v) {
return v.v.getLanguage();
}
public boolean isCompatible(AcceptableLanguageTag t, Locale u) {
return t.isCompatible(u);
}
public int getQualitySource(VariantHolder qsv, Locale u) {
return QualityFactor.MINUMUM_QUALITY;
}
public String getVaryHeaderValue() {
return HttpHeaders.ACCEPT_LANGUAGE;
}
};
private static final DimensionChecker CHARSET_DC =
new DimensionChecker() {
public String getDimension(VariantHolder v) {
MediaType m = v.v.getMediaType();
return (m != null) ? m.getParameters().get("charset") : null;
}
public boolean isCompatible(AcceptableToken t, String u) {
return t.isCompatible(u);
}
public int getQualitySource(VariantHolder qsv, String u) {
return QualityFactor.MINUMUM_QUALITY;
}
public String getVaryHeaderValue() {
return HttpHeaders.ACCEPT_CHARSET;
}
};
private static final DimensionChecker ENCODING_DC =
new DimensionChecker() {
public String getDimension(VariantHolder v) {
return v.v.getEncoding();
}
public boolean isCompatible(AcceptableToken t, String u) {
return t.isCompatible(u);
}
public int getQualitySource(VariantHolder qsv, String u) {
return QualityFactor.MINUMUM_QUALITY;
}
public String getVaryHeaderValue() {
return HttpHeaders.ACCEPT_ENCODING;
}
};
/**
* Select variants for a given dimension.
*
* @param the collection of variants.
*
* @param as the list of acceptable dimension values, ordered by the quality
* parameter, with the highest quality dimension value occurring
* first.
* @param dc the dimension checker
*/
private static LinkedList selectVariants(
LinkedList vs,
List as,
DimensionChecker dc,
Set vary) {
int cq = QualityFactor.MINUMUM_QUALITY;
int cqs = QualityFactor.MINUMUM_QUALITY;
final LinkedList selected = new LinkedList();
// Iterate over the acceptable entries
// This assumes the entries are ordered by the quality
for (final T a : as) {
final int q = a.getQuality();
final Iterator iv = vs.iterator();
while (iv.hasNext()) {
final VariantHolder v = iv.next();
// Get the dimension value of the variant to check
final U d = dc.getDimension(v);
if (d != null) {
vary.add(dc.getVaryHeaderValue());
// Check if the acceptable entry is compatable with
// the dimension value
final int qs = dc.getQualitySource(v, d);
if (qs >= cqs && dc.isCompatible(a, d)) {
if (qs > cqs) {
cqs = qs;
cq = q;
// Remove all entries that were added for qs < cqs
selected.clear();
selected.add(v);
} else if (q > cq) {
cq = q;
// Add variant with higher accept quality at the front
selected.addFirst(v);
} else if (q == cq) {
// Ensure selection is stable with order of variants
// with same quality of source and accept quality
selected.add(v);
}
iv.remove();
}
}
}
}
// Add all variants that are not compatible with this dimension
// to the end
for (VariantHolder v : vs) {
if (dc.getDimension(v) == null)
selected.add(v);
}
return selected;
}
private static class VariantHolder {
private final Variant v;
private final int mediaTypeQs;
public VariantHolder(Variant v) {
this(v, QualitySourceMediaType.DEFAULT_QUALITY_SOURCE_FACTOR);
}
public VariantHolder(Variant v, int mediaTypeQs) {
this.v = v;
this.mediaTypeQs = mediaTypeQs;
}
}
private static LinkedList getVariantHolderList(final List variants) {
final LinkedList l = new LinkedList();
for (Variant v : variants) {
final MediaType mt = v.getMediaType();
if (mt != null) {
if (mt instanceof QualitySourceMediaType || mt.getParameters().
containsKey(QualitySourceMediaType.QUALITY_SOURCE_FACTOR)) {
int qs = QualitySourceMediaType.getQualitySource(mt);
l.add(new VariantHolder(v, qs));
} else {
l.add(new VariantHolder(v));
}
} else {
l.add(new VariantHolder(v));
}
}
return l;
}
public static Variant selectVariant(ContainerRequest r, List variants) {
LinkedList vhs = getVariantHolderList(variants);
Set vary = new HashSet();
vhs = selectVariants(vhs, HttpHelper.getAccept(r), MEDIA_TYPE_DC, vary);
vhs = selectVariants(vhs, HttpHelper.getAcceptLanguage(r), LANGUAGE_TAG_DC, vary);
vhs = selectVariants(vhs, HttpHelper.getAcceptCharset(r), CHARSET_DC, vary);
vhs = selectVariants(vhs, HttpHelper.getAcceptEncoding(r), ENCODING_DC, vary);
if (vhs.isEmpty()) {
return null;
} else {
StringBuilder varyHeader = new StringBuilder();
for (String v : vary) {
if (varyHeader.length() > 0) {
varyHeader.append(',');
}
varyHeader.append(v);
}
r.getProperties().put(ContainerRequest.VARY_HEADER, varyHeader.toString());
return vhs.iterator().next().v;
}
}
}
