Repository: olingo-odata4 Updated Branches: refs/heads/master 394d0f816 -> 59766b23b
http://git-wip-us.apache.org/repos/asf/olingo-odata4/blob/2ebdea80/lib/server-tecsvc/src/main/java/org/apache/olingo/server/tecsvc/processor/queryoptions/options/ServerSidePagingHandler.java ---------------------------------------------------------------------- diff --git a/lib/server-tecsvc/src/main/java/org/apache/olingo/server/tecsvc/processor/queryoptions/options/ServerSidePagingHandler.java b/lib/server-tecsvc/src/main/java/org/apache/olingo/server/tecsvc/processor/queryoptions/options/ServerSidePagingHandler.java new file mode 100644 index 0000000..db8b6fb --- /dev/null +++ b/lib/server-tecsvc/src/main/java/org/apache/olingo/server/tecsvc/processor/queryoptions/options/ServerSidePagingHandler.java @@ -0,0 +1,110 @@ +/* + * 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. + */ +package org.apache.olingo.server.tecsvc.processor.queryoptions.options; + +import java.net.URI; +import java.net.URISyntaxException; +import java.util.Locale; + +import org.apache.olingo.commons.api.data.EntitySet; +import org.apache.olingo.commons.api.http.HttpStatusCode; +import org.apache.olingo.commons.core.Encoder; +import org.apache.olingo.server.api.ODataApplicationException; +import org.apache.olingo.server.api.uri.UriInfo; +import org.apache.olingo.server.api.uri.queryoption.SkipTokenOption; +import org.apache.olingo.server.api.uri.queryoption.SystemQueryOptionKind; + +public class ServerSidePagingHandler { + private static final int MAX_PAGE_SIZE = 10; + + public static void + applyServerSidePaging(final EntitySet entitySet, final String rawRequestUri, final UriInfo uriInfo) + throws ODataApplicationException { + if (shouldApplyServerSidePaging(entitySet)) { + final int maxPageSize = getMaxPageSize(); + final int page = getPage(uriInfo.getSkipTokenOption()); + final int itemsToSkip = maxPageSize * page; + + if (itemsToSkip <= entitySet.getEntities().size()) { + SkipHandler.popAtMost(entitySet, itemsToSkip); + final int remainingItems = entitySet.getEntities().size(); + TopHandler.reduceToSize(entitySet, maxPageSize); + + // Determine if a new next Link has to be provided + if (remainingItems > maxPageSize) { + entitySet.setNext(createNextLink(uriInfo, rawRequestUri, page + 1)); + } + } else { + throw new ODataApplicationException("Invalid skiptoken", HttpStatusCode.BAD_REQUEST.getStatusCode(), + Locale.ROOT); + } + } + } + + private static URI createNextLink(final UriInfo uriInfo, final String rawRequestUri, final Integer page) + throws ODataApplicationException { + + try { + // Remove skip token + String nextlink = rawRequestUri; + + // Remove a may existing skiptoken, make sure that the query part is not empty + if (rawRequestUri.contains("?")) { + nextlink = rawRequestUri.replaceAll("(\\$|%24)skiptoken=.+&?", "").replaceAll("(\\?|&)$", ""); + } + + // Add a question mark or an ampersand, depending of the current query part + if (!nextlink.contains("?")) { + nextlink = nextlink + "?"; + } else { + nextlink = nextlink + "&"; + } + + // Append the new nextlink + return new URI(nextlink + Encoder.encode(SystemQueryOptionKind.SKIPTOKEN.toString()) + "=" + + Encoder.encode(page.toString())); + + } catch (URISyntaxException e) { + throw new ODataApplicationException("Exception while constructing next link", + HttpStatusCode.INTERNAL_SERVER_ERROR.getStatusCode(), Locale.ROOT); + } + } + + private static int getPage(SkipTokenOption skipTokenOption) throws ODataApplicationException { + if (skipTokenOption != null) { + try { + return Integer.parseInt(skipTokenOption.getValue()); + } catch (NumberFormatException e) { + throw new ODataApplicationException("Invalid skip token", HttpStatusCode.BAD_REQUEST.getStatusCode(), + Locale.ROOT); + } + } else { + return 0; + } + } + + private static boolean shouldApplyServerSidePaging(final EntitySet entitySet) { + return true; + } + + private static int getMaxPageSize() { + // TODO Consider odata.maxpagesize preference? + return MAX_PAGE_SIZE; + } +} http://git-wip-us.apache.org/repos/asf/olingo-odata4/blob/2ebdea80/lib/server-tecsvc/src/main/java/org/apache/olingo/server/tecsvc/processor/queryoptions/options/SkipHandler.java ---------------------------------------------------------------------- diff --git a/lib/server-tecsvc/src/main/java/org/apache/olingo/server/tecsvc/processor/queryoptions/options/SkipHandler.java b/lib/server-tecsvc/src/main/java/org/apache/olingo/server/tecsvc/processor/queryoptions/options/SkipHandler.java new file mode 100644 index 0000000..48414ea --- /dev/null +++ b/lib/server-tecsvc/src/main/java/org/apache/olingo/server/tecsvc/processor/queryoptions/options/SkipHandler.java @@ -0,0 +1,54 @@ +/* + * 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. + */ +package org.apache.olingo.server.tecsvc.processor.queryoptions.options; + +import java.util.Iterator; +import java.util.Locale; + +import org.apache.olingo.commons.api.data.Entity; +import org.apache.olingo.commons.api.data.EntitySet; +import org.apache.olingo.commons.api.http.HttpStatusCode; +import org.apache.olingo.server.api.ODataApplicationException; +import org.apache.olingo.server.api.uri.queryoption.SkipOption; + +public class SkipHandler { + public static void applySkipSystemQueryHandler(final SkipOption skipOption, final EntitySet entitySet) + throws ODataApplicationException { + + if (skipOption != null) { + if (skipOption.getValue() >= 0) { + popAtMost(entitySet, skipOption.getValue()); + } else { + throw new ODataApplicationException("Skip value must be positive", HttpStatusCode.BAD_REQUEST.getStatusCode(), + Locale.ROOT); + } + } + } + + static void popAtMost(final EntitySet entitySet, final int n) { + final Iterator<Entity> iter = entitySet.getEntities().iterator(); + int i = 0; + + while (iter.hasNext() && i < n) { + iter.next(); + iter.remove(); + i++; + } + } +} http://git-wip-us.apache.org/repos/asf/olingo-odata4/blob/2ebdea80/lib/server-tecsvc/src/main/java/org/apache/olingo/server/tecsvc/processor/queryoptions/options/TopHandler.java ---------------------------------------------------------------------- diff --git a/lib/server-tecsvc/src/main/java/org/apache/olingo/server/tecsvc/processor/queryoptions/options/TopHandler.java b/lib/server-tecsvc/src/main/java/org/apache/olingo/server/tecsvc/processor/queryoptions/options/TopHandler.java new file mode 100644 index 0000000..7edc105 --- /dev/null +++ b/lib/server-tecsvc/src/main/java/org/apache/olingo/server/tecsvc/processor/queryoptions/options/TopHandler.java @@ -0,0 +1,47 @@ +/* + * 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. + */ +package org.apache.olingo.server.tecsvc.processor.queryoptions.options; + +import java.util.Locale; + +import org.apache.olingo.commons.api.data.EntitySet; +import org.apache.olingo.commons.api.http.HttpStatusCode; +import org.apache.olingo.server.api.ODataApplicationException; +import org.apache.olingo.server.api.uri.queryoption.TopOption; + +public class TopHandler { + public static void applyTopSystemQueryOption(final TopOption topOption, final EntitySet entitySet) + throws ODataApplicationException { + + if (topOption != null) { + if (topOption.getValue() >= 0) { + reduceToSize(entitySet, topOption.getValue()); + } else { + throw new ODataApplicationException("Top value must be positive", HttpStatusCode.BAD_REQUEST.getStatusCode(), + Locale.ROOT); + } + } + } + + static void reduceToSize(final EntitySet entitySet, final int n) { + while (entitySet.getEntities().size() > n) { + entitySet.getEntities().remove(entitySet.getEntities().size() - 1); + } + } +}
