| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * Licensed 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 from |
| * |
| * 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 edu.uci.ics.hyracks.storage.am.lsm.invertedindex.ondisk; |
| |
| import edu.uci.ics.hyracks.api.dataflow.value.ITypeTraits; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.ITupleReference; |
| import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.api.IInvertedListBuilder; |
| |
| public class FixedSizeElementInvertedListBuilder implements IInvertedListBuilder { |
| private final int listElementSize; |
| private int listSize = 0; |
| |
| private byte[] targetBuf; |
| private int pos; |
| |
| public FixedSizeElementInvertedListBuilder(ITypeTraits[] invListFields) { |
| int tmp = 0; |
| for (int i = 0; i < invListFields.length; i++) { |
| tmp += invListFields[i].getFixedLength(); |
| } |
| listElementSize = tmp; |
| } |
| |
| @Override |
| public boolean startNewList(ITupleReference tuple, int tokenField) { |
| if (pos + listElementSize > targetBuf.length) { |
| return false; |
| } else { |
| listSize = 0; |
| return true; |
| } |
| } |
| |
| @Override |
| public boolean appendElement(ITupleReference tuple, int numTokenFields, int numElementFields) { |
| if (pos + listElementSize > targetBuf.length) { |
| return false; |
| } |
| |
| for (int i = 0; i < numElementFields; i++) { |
| int field = numTokenFields + i; |
| System.arraycopy(tuple.getFieldData(field), tuple.getFieldStart(field), targetBuf, pos, |
| tuple.getFieldLength(field)); |
| } |
| |
| listSize++; |
| pos += listElementSize; |
| |
| return true; |
| } |
| |
| @Override |
| public void setTargetBuffer(byte[] targetBuf, int startPos) { |
| this.targetBuf = targetBuf; |
| this.pos = startPos; |
| } |
| |
| @Override |
| public int getListSize() { |
| return listSize; |
| } |
| |
| @Override |
| public int getPos() { |
| return pos; |
| } |
| } |