/*
* 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.jackrabbit.core.value;
import org.apache.jackrabbit.core.data.DataIdentifier;
import org.apache.jackrabbit.core.data.DataRecord;
import org.apache.jackrabbit.core.data.DataStore;
import org.apache.jackrabbit.core.data.DataStoreException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.InputStream;
import javax.jcr.RepositoryException;
/**
* Represents binary data which is stored in the data store.
*/
class BLOBInDataStore extends BLOBFileValue {
private final DataStore store;
private final DataIdentifier identifier;
/**
* the prefix of the string representation of this value
*/
private static final String PREFIX = "dataStore:";
/**
* The default logger
*/
private static Logger log = LoggerFactory.getLogger(BLOBInDataStore.class);
private BLOBInDataStore(DataStore store, DataIdentifier identifier) {
assert store != null;
assert identifier != null;
this.store = store;
this.identifier = identifier;
}
void delete(boolean pruneEmptyParentDirs) {
// do nothing
}
void discard() {
// do nothing
}
DataIdentifier getDataIdentifier() {
return identifier;
}
boolean isImmutable() {
return true;
}
public boolean equals(Object obj) {
if (!(obj instanceof BLOBInDataStore) || obj == null) {
return false;
}
BLOBInDataStore other = (BLOBInDataStore) obj;
return store == other.store && identifier.equals(other.identifier);
}
/**
* Returns zero to satisfy the Object equals/hashCode contract.
* This class is mutable and not meant to be used as a hash key.
*
* @return always zero
* @see Object#hashCode()
*/
public int hashCode() {
return 0;
}
public long getSize() {
try {
return getDataRecord().getLength();
} catch (DataStoreException e) {
log.warn("getSize for " + identifier + " failed", e);
return -1;
}
}
public InputStream getStream() throws RepositoryException {
return getDataRecord().getStream();
}
public String toString() {
return PREFIX + identifier;
}
static BLOBInDataStore getInstance(DataStore store, String s) {
String id = s.substring(PREFIX.length());
DataIdentifier identifier = new DataIdentifier(id);
return new BLOBInDataStore(store, identifier);
}
static BLOBInDataStore getInstance(DataStore store, DataIdentifier identifier) {
return new BLOBInDataStore(store, identifier);
}
static BLOBInDataStore getInstance(DataStore store, InputStream in) throws DataStoreException {
DataRecord rec = store.addRecord(in);
DataIdentifier identifier = rec.getIdentifier();
return new BLOBInDataStore(store, identifier);
}
/**
* Checks if String can be converted to an instance of this class.
* @param s
* @return true if it can be converted
*/
static boolean isInstance(String s) {
return s.startsWith(PREFIX);
}
private DataRecord getDataRecord() throws DataStoreException {
// may not keep the record, otherwise garbage collection doesn't work
return store.getRecord(identifier);
}
}