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* 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
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* KIND, either express or implied. See the License for the
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package org.apache.cayenne.crypto.transformer;
import org.apache.cayenne.access.jdbc.ColumnDescriptor;
import org.apache.cayenne.access.translator.DbAttributeBinding;
import org.apache.cayenne.access.types.ExtendedTypeMap;
import org.apache.cayenne.crypto.map.ColumnMapper;
import org.apache.cayenne.crypto.transformer.bytes.BytesTransformerFactory;
import org.apache.cayenne.crypto.transformer.value.ValueDecryptor;
import org.apache.cayenne.crypto.transformer.value.ValueEncryptor;
import org.apache.cayenne.crypto.transformer.value.ValueTransformerFactory;
import org.apache.cayenne.di.Inject;
import org.apache.cayenne.map.DbAttribute;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* @since 4.0
*/
public class DefaultTransformerFactory implements TransformerFactory {
private BytesTransformerFactory bytesTransformerFactory;
private ColumnMapper columnMapper;
private ValueTransformerFactory transformerFactory;
public DefaultTransformerFactory(@Inject ColumnMapper columnMapper,
@Inject ValueTransformerFactory transformerFactory, @Inject BytesTransformerFactory bytesTransformerFactory) {
this.columnMapper = columnMapper;
this.transformerFactory = transformerFactory;
this.bytesTransformerFactory = bytesTransformerFactory;
}
@Override
public MapTransformer decryptor(ColumnDescriptor[] columns, Object sampleRow) {
if (!(sampleRow instanceof Map)) {
return null;
}
int len = columns.length;
List<Integer> cryptoColumns = null;
for (int i = 0; i < len; i++) {
DbAttribute a = columns[i].getAttribute();
if (a != null && columnMapper.isEncrypted(a)) {
if (cryptoColumns == null) {
cryptoColumns = new ArrayList<>(len - i);
}
cryptoColumns.add(i);
}
}
if (cryptoColumns != null) {
int dlen = cryptoColumns.size();
String[] mapKeys = new String[dlen];
ValueDecryptor[] transformers = new ValueDecryptor[dlen];
for (int i = 0; i < dlen; i++) {
ColumnDescriptor cd = columns[cryptoColumns.get(i)];
mapKeys[i] = cd.getDataRowKey();
transformers[i] = transformerFactory.decryptor(cd.getAttribute());
}
return new DefaultMapTransformer(mapKeys, transformers, bytesTransformerFactory.decryptor());
}
return null;
}
@Override
public BindingsTransformer encryptor(DbAttributeBinding[] bindings, ExtendedTypeMap extendedTypeMap) {
int len = bindings.length;
List<Integer> cryptoColumns = null;
for (int i = 0; i < len; i++) {
DbAttribute a = bindings[i].getAttribute();
if (columnMapper.isEncrypted(a)) {
if (cryptoColumns == null) {
cryptoColumns = new ArrayList<>(len - i);
}
cryptoColumns.add(i);
}
}
if (cryptoColumns != null) {
int dlen = cryptoColumns.size();
int[] positions = new int[dlen];
ValueEncryptor[] transformers = new ValueEncryptor[dlen];
for (int i = 0; i < dlen; i++) {
int pos = cryptoColumns.get(i);
DbAttributeBinding b = bindings[pos];
positions[i] = pos;
transformers[i] = transformerFactory.encryptor(b.getAttribute());
}
return new DefaultBindingsTransformer(positions, transformers, bytesTransformerFactory.encryptor(), extendedTypeMap);
}
return null;
}
}