content: /*
   *                         Vortex OpenSplice
   *
   *   This software and documentation are Copyright 2006 to TO_YEAR ADLINK
   *   Technology Limited, its affiliated companies and licensors. All rights
   *   reserved.
   *
   *   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 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.opensplice.dds.sub;
  
  import java.lang.reflect.Array;
  import java.lang.reflect.Field;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.omg.dds.sub.Sample;
  import org.opensplice.dds.core.DDSExceptionImpl;
  import org.opensplice.dds.core.IllegalArgumentExceptionImpl;
  import org.opensplice.dds.core.OsplServiceEnvironment;
  
  import DDS.SampleInfo;
  import DDS.SampleInfoSeqHolder;
  
  public class PreAllocatorImpl<TYPE> implements PreAllocator<TYPE> {
      private final OsplServiceEnvironment environment;
      private final Class<?> dataSeqHolderClaz;
      private final Class<TYPE> dataClaz;
      private final Field dataSeqHolderValueField;
  
      private SampleInfoSeqHolder infoSeqHolder;
      private Object dataSeqHolder;
      private List<Sample<TYPE>> sampleList;
      private int lastLength;
  
      public PreAllocatorImpl(OsplServiceEnvironment environment,
              Class<?> dataSeqHolderClaz, Field dataSeqHolderValueField,
              Class<TYPE> dataClaz, List<Sample<TYPE>> preAllocated) {
          this.environment = environment;
          this.sampleList = preAllocated;
          this.dataSeqHolderClaz = dataSeqHolderClaz;
          this.dataClaz = dataClaz;
          this.dataSeqHolderValueField = dataSeqHolderValueField;
          this.lastLength = -1;
          this.setSampleList(preAllocated);
      }
  
      @Override
      public void setSampleList(List<Sample<TYPE>> preAllocated) {
          try {
              if (preAllocated == null) {
                  this.sampleList = new ArrayList<Sample<TYPE>>();
                  this.infoSeqHolder = new SampleInfoSeqHolder();
                  this.dataSeqHolder = dataSeqHolderClaz.newInstance();
              } else if (preAllocated == this.sampleList) {
                  if (this.lastLength != preAllocated.size()) {
                      if (this.lastLength == -1) {
                          this.infoSeqHolder = new SampleInfoSeqHolder();
                          this.dataSeqHolder = dataSeqHolderClaz.newInstance();
                      }
                      this.infoSeqHolder.value = new SampleInfo[preAllocated
                              .size()];
                      this.dataSeqHolderValueField.set(this.dataSeqHolder,
                              Array.newInstance(dataClaz, preAllocated.size()));
                      this.copyData();
                  }
              } else {
                  this.sampleList = preAllocated;
                  this.infoSeqHolder = new SampleInfoSeqHolder();
                  this.dataSeqHolder = dataSeqHolderClaz.newInstance();
                  this.copyData();
              }
              this.lastLength = this.sampleList.size();
          } catch (InstantiationException e) {
              throw new DDSExceptionImpl(this.environment, "Internal error ("
                      + e.getMessage() + ").");
          } catch (IllegalAccessException e) {
              throw new DDSExceptionImpl(this.environment, "Internal error ("
                      + e.getMessage() + ").");
          } catch (ClassCastException ce) {
              throw new IllegalArgumentExceptionImpl(this.environment,
                      "Usage of non-OpenSplice Sample implementation is not supported.");
          }
      }
  
      private void copyData() {
          int i = 0;
  
          try {
              this.infoSeqHolder.value = new SampleInfo[this.sampleList.size()];
              this.dataSeqHolderValueField.set(this.dataSeqHolder,
                      Array.newInstance(dataClaz, this.sampleList.size()));
              Object dataValue = this.dataSeqHolderValueField
                      .get(this.dataSeqHolder);
  
              for (Sample<TYPE> sample : this.sampleList) {
                  this.infoSeqHolder.value[i] = ((SampleImpl<TYPE>) sample)
                          .getInfo();
                  Array.set(dataValue, i++, sample.getData());
              }
          } catch (IllegalAccessException e) {
              throw new DDSExceptionImpl(this.environment, "Internal error ("
                      + e.getMessage() + ").");
          } catch (ClassCastException ce) {
              throw new IllegalArgumentExceptionImpl(this.environment,
                      "Usage of non-OpenSplice Sample implementation is not supported.");
          }
      }
  
      @Override
      public void updateReferences() {
          this.updateReferencesImproved();
      }
  
      @SuppressWarnings("unchecked")
      private void updateReferencesImproved() {
          int index;
  
          assert (this.lastLength == this.sampleList.size());
  
          if (this.infoSeqHolder.value.length > this.lastLength) {
              try {
                  Object dataValue = this.dataSeqHolderValueField
                          .get(this.dataSeqHolder);
                  index = this.lastLength;
  
                  while (index < this.infoSeqHolder.value.length) {
                      this.sampleList.add(new SampleImpl<TYPE>(
                              this.environment,
                              (TYPE)Array.get(dataValue, index),
                              this.infoSeqHolder.value[index]));
                      index++;
                  }
              } catch (IllegalArgumentException e) {
                  throw new DDSExceptionImpl(this.environment, "Internal error ("
                          + e.getMessage() + ").");
              } catch (IllegalAccessException e) {
                  throw new DDSExceptionImpl(this.environment, "Internal error ("
                          + e.getMessage() + ").");
              }
          } else if (this.infoSeqHolder.value.length < this.lastLength) {
              index = this.infoSeqHolder.value.length;
              int curLength = this.lastLength;
  
              while (index < curLength) {
                  this.sampleList.remove(index);
                  curLength--;
              }
          }
          this.lastLength = this.sampleList.size();
      }
  
      @Override
      public Object getDataSeqHolder() {
          return this.dataSeqHolder;
      }
  
      @Override
      public SampleInfoSeqHolder getInfoSeqHolder() {
          return this.infoSeqHolder;
      }
  
      @Override
      public List<Sample<TYPE>> getSampleList() {
          return this.sampleList;
      }
  
  }
  