| /* |
| * 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.vxquery.datamodel.builders.sequence; |
| |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import org.apache.hyracks.data.std.api.IMutableValueStorage; |
| import org.apache.hyracks.data.std.api.IValueReference; |
| import org.apache.hyracks.data.std.util.ArrayBackedValueStorage; |
| import org.apache.vxquery.datamodel.builders.base.IBuilder; |
| import org.apache.vxquery.datamodel.values.ValueTag; |
| import org.apache.vxquery.util.GrowableIntArray; |
| |
| public class SequenceBuilder implements IBuilder { |
| private final GrowableIntArray slots = new GrowableIntArray(); |
| private final ArrayBackedValueStorage dataArea = new ArrayBackedValueStorage(); |
| private DataOutput out; |
| |
| @Override |
| public void reset(IMutableValueStorage mvs) { |
| out = mvs.getDataOutput(); |
| slots.clear(); |
| dataArea.reset(); |
| } |
| |
| public void addItem(IValueReference p) throws IOException { |
| dataArea.getDataOutput().write(p.getByteArray(), p.getStartOffset(), p.getLength()); |
| slots.append(dataArea.getLength()); |
| } |
| |
| public void addItem(int tagValue, IValueReference p) throws IOException { |
| dataArea.getDataOutput().write(tagValue); |
| dataArea.getDataOutput().write(p.getByteArray(), p.getStartOffset(), p.getLength()); |
| slots.append(dataArea.getLength()); |
| } |
| |
| @Override |
| public void finish() throws IOException { |
| if (slots.getSize() != 1) { |
| out.write(ValueTag.SEQUENCE_TAG); |
| int size = slots.getSize(); |
| out.writeInt(size); |
| if (size > 0) { |
| int[] slotArray = slots.getArray(); |
| for (int i = 0; i < size; ++i) { |
| out.writeInt(slotArray[i]); |
| } |
| out.write(dataArea.getByteArray(), dataArea.getStartOffset(), dataArea.getLength()); |
| } |
| } else { |
| out.write(dataArea.getByteArray(), dataArea.getStartOffset(), dataArea.getLength()); |
| } |
| } |
| } |