--- /dev/null
+/*\r
+\r
+ Derby - Class org.apache.derby.impl.store.access.conglomerate.BinaryOrderableWrapper\r
+\r
+ Licensed to the Apache Software Foundation (ASF) under one or more\r
+ contributor license agreements. See the NOTICE file distributed with\r
+ this work for additional information regarding copyright ownership.\r
+ The ASF licenses this file to you under the Apache License, Version 2.0\r
+ (the "License"); you may not use this file except in compliance with\r
+ the License. You may obtain a copy of the License at\r
+\r
+ http://www.apache.org/licenses/LICENSE-2.0\r
+\r
+ Unless required by applicable law or agreed to in writing, software\r
+ distributed under the License is distributed on an "AS IS" BASIS,\r
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
+ See the License for the specific language governing permissions and\r
+ limitations under the License.\r
+\r
+ */\r
+\r
+package org.apache.derby.impl.store.access.conglomerate;\r
+\r
+import org.apache.derby.iapi.services.io.ArrayInputStream;\r
+\r
+import org.apache.derby.iapi.services.sanity.SanityManager;\r
+\r
+import org.apache.derby.iapi.services.io.Storable;\r
+import org.apache.derby.iapi.services.io.TypedFormat;\r
+\r
+import org.apache.derby.iapi.store.access.BinaryOrderable;\r
+\r
+import java.io.ObjectOutput;\r
+import java.io.ObjectInput;\r
+import java.io.IOException;\r
+\r
+/**\r
+\r
+The BinaryOrderableWrapper is a wrapper class which intercepts the \r
+readExternal() callback made by raw store during a fetch, and does a comparison\r
+instead.\r
+**/\r
+\r
+class BinaryOrderableWrapper implements Storable\r
+{\r
+\r
+ BinaryOrderable ref_object; \r
+ BinaryOrderable other_object;\r
+ int cmp_result;\r
+\r
+ /* Constructors for This class: */\r
+ BinaryOrderableWrapper()\r
+ {\r
+ }\r
+\r
+ /* Private/Protected methods of This class: */\r
+ /**\r
+ * Short one line description of routine.\r
+ * <p>\r
+ * Longer descrption of routine.\r
+ * <p>\r
+ *\r
+ * @param ref_object The object that this object is wrapping (ie. being\r
+ * read from disk)\r
+ * @param other_object The object to compare ref_object to.\r
+ **/\r
+ protected void init (\r
+ BinaryOrderable ref_object,\r
+ BinaryOrderable other_object)\r
+ {\r
+ this.ref_object = ref_object;\r
+ this.other_object = other_object;\r
+ }\r
+\r
+ /* Public Methods of This class: */\r
+ /**\r
+ * Short one line description of routine.\r
+ * <p>\r
+ * Longer descrption of routine.\r
+ * <p>\r
+ *\r
+ * @return The identifier to be used to open the conglomerate later.\r
+ **/\r
+ public int getCmpResult()\r
+ {\r
+ return(this.cmp_result);\r
+ }\r
+\r
+\r
+ /* Public Methods of Storable interface - Externalizable, TypedFormat: \r
+ */\r
+\r
+ public int getTypeFormatId() {\r
+ // RESOLVE - what should this return?\r
+ if (SanityManager.DEBUG)\r
+ SanityManager.THROWASSERT("If someone calls this it is a problem.");\r
+ return(((TypedFormat)this.ref_object).getTypeFormatId());\r
+ }\r
+\r
+ /**\r
+ Return whether the value is null or not.\r
+ The containerid being zero is what determines nullness; subclasses\r
+ are not expected to override this method.\r
+ @see org.apache.derby.iapi.services.io.Storable#isNull\r
+ **/\r
+ public boolean isNull()\r
+ {\r
+ // RESOLVE - what does it mean for this wrapper to be called isNull()?\r
+ if (SanityManager.DEBUG)\r
+ SanityManager.THROWASSERT("If someone calls this it is a problem.");\r
+ return(false);\r
+ }\r
+\r
+ /**\r
+ Restore the in-memory representation to the null value.\r
+ The containerid being zero is what determines nullness; subclasses\r
+ are not expected to override this method.\r
+\r
+ @see org.apache.derby.iapi.services.io.Storable#restoreToNull\r
+ **/\r
+ public void restoreToNull()\r
+ {\r
+ // RESOLVE - base object is null.\r
+ if (SanityManager.DEBUG)\r
+ SanityManager.THROWASSERT("WORK TODO - code up null compare.");\r
+\r
+ return;\r
+ }\r
+\r
+ /**\r
+ Restore the in-memory representation from the stream.\r
+\r
+ @exception ClassNotFoundException Thrown if the stored representation is\r
+ serialized and a class named in the stream could not be found.\r
+\r
+ @exception IOException thrown by readObject()\r
+\r
+ \r
+ @see java.io.Externalizable#readExternal\r
+ */\r
+ public void readExternal(ObjectInput in) \r
+ throws IOException, ClassNotFoundException\r
+ {\r
+\r
+ // do the read byte by byte and return the comparison \r
+ this.cmp_result = this.ref_object.binarycompare(in, this.other_object);\r
+ \r
+ if (SanityManager.DEBUG)\r
+ SanityManager.THROWASSERT("WORK TODO - code up readExternal.");\r
+ }\r
+ public void readExternalFromArray(ArrayInputStream in) \r
+ throws IOException, ClassNotFoundException\r
+ {\r
+\r
+ // do the read byte by byte and return the comparison \r
+ this.cmp_result = this.ref_object.binarycompare(in, this.other_object);\r
+ \r
+ if (SanityManager.DEBUG)\r
+ SanityManager.THROWASSERT("WORK TODO - code up readExternal.");\r
+ }\r
+ \r
+ /**\r
+ * Store the stored representation of the column value in the stream.\r
+ * <p>\r
+ * A BinaryOrderableWrapper is never used to store data out, only to read\r
+ * data from disk and compare it to another byte stream.\r
+ *\r
+ * @param out Stream to write the object to.\r
+ *\r
+ * @exception IOException thrown by writeObject()\r
+ *\r
+ **/\r
+ public void writeExternal(ObjectOutput out) \r
+ throws IOException\r
+ {\r
+ if (SanityManager.DEBUG)\r
+ SanityManager.THROWASSERT("Write should never be called.");\r
+ return;\r
+ }\r
+}\r
projects / Benchmarks_CSolver.git / blobdiff