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/*******************************************************************************
* Copyright (c) 2015, 2016 Google, Inc and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Stefan Xenos (Google) - Initial implementation
*******************************************************************************/
package org.eclipse.jdt.internal.core.nd.field;
import org.eclipse.jdt.internal.core.nd.Nd;
import org.eclipse.jdt.internal.core.nd.NdNode;
import org.eclipse.jdt.internal.core.nd.db.BTree;
import org.eclipse.jdt.internal.core.nd.db.ModificationLog;
import org.eclipse.jdt.internal.core.nd.db.ModificationLog.Tag;
import org.eclipse.jdt.internal.core.nd.db.Database;
import org.eclipse.jdt.internal.core.nd.db.EmptyString;
import org.eclipse.jdt.internal.core.nd.db.IString;
/**
* Represents a search key into a global search index.
*/
public class FieldSearchKey<T> extends BaseField implements IDestructableField {
FieldSearchIndex<?> searchIndex;
private final Tag destructTag;
private final Tag putTag;
private FieldSearchKey(FieldSearchIndex<?> searchIndex, String structName, int fieldNumber) {
if (searchIndex != null) {
if (searchIndex.searchKey != null && searchIndex.searchKey != this) {
throw new IllegalArgumentException(
"Attempted to construct a FieldSearchKey referring to a search index that is " //$NON-NLS-1$
+ "already in use by a different key"); //$NON-NLS-1$
}
searchIndex.searchKey = this;
}
this.searchIndex = searchIndex;
setFieldName("field " + fieldNumber + ", a " + getClass().getSimpleName() //$NON-NLS-1$//$NON-NLS-2$
+ " in struct " + structName); //$NON-NLS-1$
this.putTag = ModificationLog.createTag("Writing " + getFieldName()); //$NON-NLS-1$
this.destructTag = ModificationLog.createTag("Destructing " + getFieldName()); //$NON-NLS-1$
}
/**
* Creates a search key attribute in the given struct which stores an entry in the given global search index
*/
public static <T, B extends NdNode> FieldSearchKey<T> create(StructDef<B> builder,
FieldSearchIndex<B> searchIndex) {
FieldSearchKey<T> result = new FieldSearchKey<T>(searchIndex, builder.getStructName(), builder.getNumFields());
builder.add(result);
builder.addDestructableField(result);
return result;
}
public void put(Nd nd, long address, String newString) {
put(nd, address, newString.toCharArray());
}
/**
* Sets the value of the key and inserts it into the index if it is not already present
*/
public void put(Nd nd, long address, char[] newString) {
Database db = nd.getDB();
db.getLog().start(this.putTag);
try {
cleanup(nd, address);
BTree btree = this.searchIndex.get(nd, Database.DATA_AREA_OFFSET);
db.putRecPtr(address + this.offset, db.newString(newString).getRecord());
btree.insert(address);
} finally {
db.getLog().end(this.putTag);
}
}
public IString get(Nd nd, long address) {
Database db = nd.getDB();
long namerec = db.getRecPtr(address + this.offset);
if (namerec == 0) {
return EmptyString.create();
}
return db.getString(namerec);
}
@Override
public void destruct(Nd nd, long address) {
Database db = nd.getDB();
db.getLog().start(this.destructTag);
try {
cleanup(nd, address);
} finally {
db.getLog().end(this.destructTag);
}
}
private void cleanup(Nd nd, long address) {
boolean isInIndex = isInIndex(nd, address);
if (isInIndex) {
// Remove this entry from the search index
this.searchIndex.get(nd, Database.DATA_AREA_OFFSET).delete(address);
get(nd, address).delete();
nd.getDB().putRecPtr(address + this.offset, 0);
}
}
/**
* Clears this key and removes it from the search index
*/
public void removeFromIndex(Nd nd, long address) {
cleanup(nd, address);
}
/**
* Returns true iff this key is currently in the index
*/
public boolean isInIndex(Nd nd, long address) {
long fieldAddress = address + this.offset;
Database db = nd.getDB();
long namerec = db.getRecPtr(fieldAddress);
boolean isInIndex = namerec != 0;
return isInIndex;
}
@Override
public int getRecordSize() {
return FieldString.RECORD_SIZE;
}
}
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