| /******************************************************************************* |
| * 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; |
| } |
| } |