1 files changed, 173 insertions, 0 deletions
diff --git a/mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/client/cache/CacheEntryUpdater.java b/mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/client/cache/CacheEntryUpdater.java
new file mode 100644
index 000000000..381a7508d
--- /dev/null
+++ b/mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/client/cache/CacheEntryUpdater.java
@@ -0,0 +1,173 @@
+/*
+ * ====================================================================
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+package ch.boye.httpclientandroidlib.impl.client.cache;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Date;
+import java.util.List;
+import java.util.ListIterator;
+
+import ch.boye.httpclientandroidlib.Header;
+import ch.boye.httpclientandroidlib.HttpResponse;
+import ch.boye.httpclientandroidlib.HttpStatus;
+import ch.boye.httpclientandroidlib.annotation.Immutable;
+import ch.boye.httpclientandroidlib.client.cache.HeaderConstants;
+import ch.boye.httpclientandroidlib.client.cache.HttpCacheEntry;
+import ch.boye.httpclientandroidlib.client.cache.Resource;
+import ch.boye.httpclientandroidlib.client.cache.ResourceFactory;
+import ch.boye.httpclientandroidlib.client.utils.DateUtils;
+import ch.boye.httpclientandroidlib.protocol.HTTP;
+import ch.boye.httpclientandroidlib.util.Args;
+
+/**
+ * Update a {@link HttpCacheEntry} with new or updated information based on the latest
+ * 304 status response from the Server.  Use the {@link HttpResponse} to perform
+ * the update.
+ *
+ * @since 4.1
+ */
+@Immutable
+class CacheEntryUpdater {
+
+    private final ResourceFactory resourceFactory;
+
+    CacheEntryUpdater() {
+        this(new HeapResourceFactory());
+    }
+
+    CacheEntryUpdater(final ResourceFactory resourceFactory) {
+        super();
+        this.resourceFactory = resourceFactory;
+    }
+
+    /**
+     * Update the entry with the new information from the response.  Should only be used for
+     * 304 responses.
+     *
+     * @param requestId
+     * @param entry The cache Entry to be updated
+     * @param requestDate When the request was performed
+     * @param responseDate When the response was gotten
+     * @param response The HttpResponse from the backend server call
+     * @return HttpCacheEntry an updated version of the cache entry
+     * @throws java.io.IOException if something bad happens while trying to read the body from the original entry
+     */
+    public HttpCacheEntry updateCacheEntry(
+            final String requestId,
+            final HttpCacheEntry entry,
+            final Date requestDate,
+            final Date responseDate,
+            final HttpResponse response) throws IOException {
+        Args.check(response.getStatusLine().getStatusCode() == HttpStatus.SC_NOT_MODIFIED,
+                "Response must have 304 status code");
+        final Header[] mergedHeaders = mergeHeaders(entry, response);
+        Resource resource = null;
+        if (entry.getResource() != null) {
+            resource = resourceFactory.copy(requestId, entry.getResource());
+        }
+        return new HttpCacheEntry(
+                requestDate,
+                responseDate,
+                entry.getStatusLine(),
+                mergedHeaders,
+                resource);
+    }
+
+    protected Header[] mergeHeaders(final HttpCacheEntry entry, final HttpResponse response) {
+
+        if (entryAndResponseHaveDateHeader(entry, response)
+                && entryDateHeaderNewerThenResponse(entry, response)) {
+            // Don't merge headers, keep the entry's headers as they are newer.
+            return entry.getAllHeaders();
+        }
+
+        final List<Header> cacheEntryHeaderList = new ArrayList<Header>(Arrays.asList(entry
+                .getAllHeaders()));
+        removeCacheHeadersThatMatchResponse(cacheEntryHeaderList, response);
+        removeCacheEntry1xxWarnings(cacheEntryHeaderList, entry);
+        cacheEntryHeaderList.addAll(Arrays.asList(response.getAllHeaders()));
+
+        return cacheEntryHeaderList.toArray(new Header[cacheEntryHeaderList.size()]);
+    }
+
+    private void removeCacheHeadersThatMatchResponse(final List<Header> cacheEntryHeaderList,
+            final HttpResponse response) {
+        for (final Header responseHeader : response.getAllHeaders()) {
+            final ListIterator<Header> cacheEntryHeaderListIter = cacheEntryHeaderList.listIterator();
+
+            while (cacheEntryHeaderListIter.hasNext()) {
+                final String cacheEntryHeaderName = cacheEntryHeaderListIter.next().getName();
+
+                if (cacheEntryHeaderName.equals(responseHeader.getName())) {
+                    cacheEntryHeaderListIter.remove();
+                }
+            }
+        }
+    }
+
+    private void removeCacheEntry1xxWarnings(final List<Header> cacheEntryHeaderList, final HttpCacheEntry entry) {
+        final ListIterator<Header> cacheEntryHeaderListIter = cacheEntryHeaderList.listIterator();
+
+        while (cacheEntryHeaderListIter.hasNext()) {
+            final String cacheEntryHeaderName = cacheEntryHeaderListIter.next().getName();
+
+            if (HeaderConstants.WARNING.equals(cacheEntryHeaderName)) {
+                for (final Header cacheEntryWarning : entry.getHeaders(HeaderConstants.WARNING)) {
+                    if (cacheEntryWarning.getValue().startsWith("1")) {
+                        cacheEntryHeaderListIter.remove();
+                    }
+                }
+            }
+        }
+    }
+
+    private boolean entryDateHeaderNewerThenResponse(final HttpCacheEntry entry, final HttpResponse response) {
+        final Date entryDate = DateUtils.parseDate(entry.getFirstHeader(HTTP.DATE_HEADER)
+                .getValue());
+        final Date responseDate = DateUtils.parseDate(response.getFirstHeader(HTTP.DATE_HEADER)
+                .getValue());
+        if (entryDate == null || responseDate == null) {
+            return false;
+        }
+        if (!entryDate.after(responseDate)) {
+            return false;
+        }
+        return true;
+    }
+
+    private boolean entryAndResponseHaveDateHeader(final HttpCacheEntry entry, final HttpResponse response) {
+        if (entry.getFirstHeader(HTTP.DATE_HEADER) != null
+                && response.getFirstHeader(HTTP.DATE_HEADER) != null) {
+            return true;
+        }
+
+        return false;
+    }
+
+}