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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vdslib;
import com.yahoo.document.DocumentId;
import com.yahoo.document.DocumentTypeManager;
import com.yahoo.vespa.objects.Serializer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public abstract class DocumentList {
protected DocumentList() { }
/**
* Creates a DocumentList from serialized form.
*
* @param docMan Documentmanager to use when deserializing
* @param buffer the buffer to read from
* @return a DocumentList instance
*/
public static DocumentList create(DocumentTypeManager docMan, byte[] buffer) {
return new BinaryDocumentList(docMan, buffer);
}
/**
* Creates a DocumentList from a list of entries.
* @param entries the entries to create a DocumentList from
* @return a DocumentList instance
* @see com.yahoo.vdslib.Entry
*/
public static DocumentList create(List<Entry> entries) {
return new DynamicDocumentList(entries);
}
/**
* Creates a DocumentList containing a single entry.
*
* @param entry the entry to create a DocumentList from
* @return a DocumentList instance
* @see com.yahoo.vdslib.Entry
*/
public static DocumentList create(Entry entry) {
return new DynamicDocumentList(entry);
}
/**
* Retrieves the specified Entry from the list.
*
* @param index the index of the Entry to return (0-based)
* @return the entry at the specified position
* @throws ArrayIndexOutOfBoundsException if index is < 0 or > size()
* @throws com.yahoo.document.serialization.DeserializationException if the DocumentList is stored in binary form internally and deserialization fails
*/
public abstract Entry get(int index) throws ArrayIndexOutOfBoundsException;
/**
* Returns the size of the list.
*
* @return the size of the list
*/
public abstract int size();
/**
* Returns the byte size of the list. The value returned is exact if the list is stored in
* binary form internally, otherwise it is approximate.
*
* @return the byte size of the list
*/
public abstract int getApproxByteSize();
/**
* Serialize the list into the given buffer.
*
* @param buf the buffer to serialize into
*/
public abstract void serialize(Serializer buf);
/**
* Test if a contains b
*
* @param list DocumentList contained
* @return true if a contains b
*/
public boolean containsAll(DocumentList list) {
if( this.size() < list.size()) {
return false;
}
Map<DocumentId, Integer> indexes = new HashMap<DocumentId, Integer>();
for (int i=0; i<this.size(); ++i) {
indexes.put(this.get(i).getDocumentOperation().getId(), i);
}
for (int i=0; i<list.size(); ++i) {
Integer index = indexes.get(list.get(i).getDocumentOperation().getId());
if (index == null ||
list.get(i).getTimestamp() != this.get(index).getTimestamp() ||
list.get(i).kind() != this.get(index).kind())
{
return false;
}
}
return true;
}
}
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