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MarkerImpl.java

/*
 * 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.
 */
00038 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;
  }

00061   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());
  }

00073   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);
  }
  
00095   public boolean isValid() {
    return isValid;
  }
  
}

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