| /* |
| * 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.uima.cas.impl; |
| |
| import org.apache.uima.cas.CASRuntimeException; |
| import org.apache.uima.cas.FeatureStructure; |
| import org.apache.uima.cas.Marker; |
| |
| /** |
| * A MarkerImpl holds a high-water "mark" in the CAS, |
| * for all views. |
| * Typically, one is obtained via the createMarker call |
| * on a CAS. |
| * |
| * Currently only one marker is used per CAS. |
| * The Marker enables testing on each CAS update if the |
| * update is "below" or "above" the marker - this is |
| * used for implementing delta serialization, in which |
| * only the changed data is sent. |
| */ |
| public class MarkerImpl implements Marker { |
| |
| protected int nextFSId; //next FS addr |
| protected int nextStringHeapAddr; |
| protected int nextByteHeapAddr; |
| protected int nextShortHeapAddr; |
| protected int nextLongHeapAddr; |
| protected boolean isValid; |
| |
| CASImpl cas; |
| |
| MarkerImpl(int nextFSAddr, int nextStringHeapAddr, |
| int nextByteHeapAddr, int nextShortHeapAddr, int nextLongHeapAddr, |
| CASImpl cas) { |
| this.nextFSId = nextFSAddr; |
| this.nextStringHeapAddr = nextStringHeapAddr; |
| this.nextByteHeapAddr = nextByteHeapAddr; |
| this.nextShortHeapAddr = nextShortHeapAddr; |
| this.nextLongHeapAddr = nextLongHeapAddr; |
| this.cas = cas; |
| this.isValid = true; |
| } |
| |
| public boolean isNew(FeatureStructure fs) { |
| //check if same CAS instance |
| //TODO: define a CASRuntimeException |
| if (!isValid || ((FeatureStructureImpl) fs).getCASImpl() != this.cas) { |
| CASRuntimeException e = new CASRuntimeException( |
| CASRuntimeException.CAS_MISMATCH, |
| new String[] { "FS and Marker are not from the same CAS." }); |
| throw e; |
| } |
| return isNew( ((FeatureStructureImpl) fs).getAddress()); |
| } |
| |
| public boolean isModified(FeatureStructure fs) { |
| if (!isValid || ((FeatureStructureImpl) fs).getCASImpl() != this.cas) { |
| CASRuntimeException e = new CASRuntimeException( |
| CASRuntimeException.CAS_MISMATCH, |
| new String[] { "FS and Marker are not from the same CAS." }); |
| throw e; |
| } |
| int addr = ((FeatureStructureImpl) fs).getAddress(); |
| return isModified(addr); |
| } |
| |
| boolean isNew(int addr) { |
| return (addr >= nextFSId); |
| } |
| |
| boolean isModified(int addr) { |
| if (isNew(addr)) { |
| return false; |
| } |
| return this.cas.getModifiedFSList().contains(addr); |
| } |
| |
| public boolean isValid() { |
| return isValid; |
| } |
| |
| } |