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ObjectStoreFlatGlobFilter.java
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ObjectStoreFlatGlobFilter.java
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/**
* (C) Copyright IBM Corp. 2015, 2016
*
* Licensed 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 com.ibm.stocator.fs.common;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.Queue;
import java.util.StringTokenizer;
import org.apache.commons.io.FilenameUtils;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;
import org.apache.hadoop.fs.PathOperationException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ObjectStoreFlatGlobFilter implements PathFilter {
public static final Logger LOG = LoggerFactory.getLogger(
ObjectStoreFlatGlobFilter.class.getName());
private ArrayList<String> parsedPatterns;
private int start;
private boolean bracketSupport;
public ObjectStoreFlatGlobFilter(String pathPattern1, int start1, boolean bracketSupport1)
throws PathOperationException {
bracketSupport = bracketSupport1;
parsedPatterns = parseInnerSet(pathPattern1);
start = start1;
}
private ArrayList<String> parseInnerSet(String pathStr) throws PathOperationException {
LOG.trace("Process {}", pathStr);
ArrayList<String> result = new ArrayList<String>();
// found start and finish of the external boundary { }
// we currently support only one nested level
int nestedLevel = 0;
Queue<String> q = new LinkedList<String>();
int fromIndex = pathStr.indexOf("{");
if (!bracketSupport || fromIndex < 0) {
result.add(pathStr);
return result;
}
int currIndex = fromIndex + 1;
if (fromIndex >= 0) {
q.add("{");
nestedLevel++;
while (!q.isEmpty() && currIndex < pathStr.length()) {
if (pathStr.charAt(currIndex) == '{') {
q.add("{");
nestedLevel++;
} else if (pathStr.charAt(currIndex) == '}') {
q.remove();
}
currIndex++;
}
}
if (nestedLevel > 2) {
LOG.error("Only 1 nested level allowed. Found {} for {}", nestedLevel, pathStr);
throw new PathOperationException("Only one nested level of brackets is supported");
}
if (!q.isEmpty()) {
LOG.error("Invalid input {}", pathStr);
throw new PathOperationException("Invalid input " + pathStr);
}
String globalPrefix = pathStr.substring(0, fromIndex);
LOG.trace("Global prefix {} for {}", globalPrefix, pathStr);
String globalSuffix = pathStr.substring(currIndex);
LOG.trace("Global suffix {} for {}", globalSuffix, pathStr);
// list parsed path inside external boundary
// we need to make sure we don't separate inner boundaries
StringTokenizer strk = new StringTokenizer(pathStr.substring(fromIndex + 1,
currIndex - 1), ",");
while (strk.hasMoreTokens()) {
String st = strk.nextToken();
// for each value see if internal boundary present, xx{yy,zz}ww
int startInd = st.indexOf("{");
int endInd = st.indexOf("}");
// means it break inner boundary, need to aggregate
while (endInd < 0 && startInd > 0) {
st = st + "," + strk.nextToken();
endInd = st.indexOf("}");
}
if (startInd >= 0 && endInd <= st.length()) {
String localPrefix = st.substring(0, startInd);
String localSuffix = st.substring(endInd + 1, st.length());
LOG.trace("Local prefix: {} :local suffix {} for {}", localPrefix,
localSuffix, st);
StringTokenizer localTokenizer = new StringTokenizer(st.substring(
startInd + 1, endInd), ",");
while (localTokenizer.hasMoreTokens()) {
String entry = localTokenizer.nextToken();
result.add(globalPrefix + localPrefix + entry
+ localSuffix + globalSuffix);
}
} else {
result.add(globalPrefix + st + globalSuffix);
}
}
return result;
}
@Override
public boolean accept(Path path) {
String name = path.getName();
String pathStr = path.toString();
boolean match = true;
for (String pathPattern : parsedPatterns) {
LOG.trace("accept on {}, path pattern {}, name {}", pathStr, pathPattern, name);
if (name != null && name.startsWith("part-")) {
LOG.trace("accept on parent {}, path pattern {}",
path.getParent().toString(), pathPattern);
match = FilenameUtils.wildcardMatch(path.getParent().toString() + "/", pathPattern);
} else {
match = FilenameUtils.wildcardMatch(pathStr, pathPattern);
}
if (match) {
return match;
}
}
return match;
}
public boolean hasPattern() {
return (start > 0);
}
}