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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing
/*
* 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.geode.internal.util;
import java.io.File;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.apache.geode.internal.cache.persistence.PersistentMemberID;
/**
* Contains common data tranformation utility methods and transformers.
*/
public final class TransformUtils {
/**
* Transforms PersistentMemberIDs to a user friendly log entry.
*/
public final static Transformer>, String> persistentMemberEntryToLogEntryTransformer =
new Transformer>, String>() {
@Override
public String transform(Map.Entry> entry) {
PersistentMemberID memberId = entry.getKey();
Set bucketIds = entry.getValue();
StringBuilder builder = new StringBuilder();
builder.append(persistentMemberIdToLogEntryTransformer.transform(memberId));
if (null != bucketIds) {
builder.append(" Buckets: ");
builder.append(bucketIds);
}
builder.append("\n");
return builder.toString();
}
};
/**
* Transforms PersistentMemberIDs to a user friendly log entry.
*/
public final static Transformer persistentMemberIdToLogEntryTransformer =
new Transformer() {
@Override
public String transform(PersistentMemberID memberId) {
StringBuilder builder = new StringBuilder();
if (null != memberId) {
if (null != memberId.diskStoreId) {
builder.append("\n DiskStore ID: ");
builder.append(memberId.diskStoreId.toUUID().toString());
}
if (null != memberId.name) {
builder.append("\n Name: ");
builder.append(memberId.name);
}
if ((null != memberId.host) && (null != memberId.directory)) {
builder.append("\n Location: ");
}
if (null != memberId.host) {
builder.append("/");
builder.append(memberId.host.getHostAddress());
builder.append(":");
}
if (null != memberId.directory) {
builder.append(memberId.directory);
}
builder.append("\n");
}
return builder.toString();
}
};
/**
* This is a simple file to file name transformer.
*/
public final static Transformer fileNameTransformer =
new Transformer() {
public String transform(File file) {
return file.getName();
}
};
/**
* Transforms a collection of one data type into another.
*
* @param from a collection of data to be transformed.
* @param to a collection to contain the transformed data.
* @param transformer transforms the data.
*/
public static void transform(Collection from, Collection to,
Transformer transformer) {
for (T1 instance : from) {
to.add(transformer.transform(instance));
}
}
/**
* Transforms a collection of one data type into another and returns a map using the transformed
* type as the key and the original type as the value.
*
* @param from a collection of data to be transformed.
* @param transformer transforms the data.
*
* @return a Map of transformed values that are keys to the original values.
*/
public static Map transformAndMap(Collection from,
Transformer transformer) {
Map map = new HashMap();
for (T1 instance : from) {
map.put(transformer.transform(instance), instance);
}
return map;
}
}