| /* |
| * 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.asterix.om.pointables.printer; |
| |
| import java.io.IOException; |
| import java.io.PrintStream; |
| import java.util.List; |
| |
| import edu.uci.ics.asterix.common.exceptions.AsterixException; |
| import edu.uci.ics.asterix.om.pointables.AListPointable; |
| import edu.uci.ics.asterix.om.pointables.base.IVisitablePointable; |
| import edu.uci.ics.asterix.om.types.ATypeTag; |
| import edu.uci.ics.asterix.om.types.EnumDeserializer; |
| import edu.uci.ics.hyracks.algebricks.common.utils.Pair; |
| |
| /** |
| * This class is to print the content of a list. It is ONLY visible to |
| * APrintVisitor. |
| */ |
| class AListPrinter { |
| private static String LEFT_PAREN = "{{ "; |
| private static String RIGHT_PAREN = " }}"; |
| private static String LEFT_PAREN_ORDERED = "[ "; |
| private static String RIGHT_PAREN_ORDERED = " ]"; |
| private static String COMMA = ", "; |
| |
| private final Pair<PrintStream, ATypeTag> itemVisitorArg = new Pair<PrintStream, ATypeTag>(null, null); |
| private String leftParen = LEFT_PAREN; |
| private String rightParen = RIGHT_PAREN; |
| |
| public AListPrinter(boolean ordered) { |
| if (ordered) { |
| leftParen = LEFT_PAREN_ORDERED; |
| rightParen = RIGHT_PAREN_ORDERED; |
| } |
| } |
| |
| public void printList(AListPointable listAccessor, PrintStream ps, APrintVisitor visitor) throws IOException, |
| AsterixException { |
| List<IVisitablePointable> itemTags = listAccessor.getItemTags(); |
| List<IVisitablePointable> items = listAccessor.getItems(); |
| itemVisitorArg.first = ps; |
| |
| // print the beginning part |
| ps.print(leftParen); |
| |
| // print item 0 to n-2 |
| for (int i = 0; i < items.size() - 1; i++) { |
| printItem(visitor, itemTags, items, i); |
| // print the comma |
| ps.print(COMMA); |
| } |
| |
| // print item n-1 |
| if (items.size() > 0) { |
| printItem(visitor, itemTags, items, items.size() - 1); |
| } |
| |
| // print the end part |
| ps.print(rightParen); |
| } |
| |
| private void printItem(APrintVisitor visitor, List<IVisitablePointable> itemTags, List<IVisitablePointable> items, |
| int i) throws AsterixException { |
| IVisitablePointable itemTypeTag = itemTags.get(i); |
| IVisitablePointable item = items.get(i); |
| ATypeTag typeTag = EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(itemTypeTag.getByteArray()[itemTypeTag |
| .getStartOffset()]); |
| itemVisitorArg.second = item.getLength() <= 1 ? ATypeTag.NULL : typeTag; |
| item.accept(visitor, itemVisitorArg); |
| } |
| } |