org.apache.hadoop.fs.shell.find.Name Maven / Gradle / Ivy
/**
* 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.hadoop.fs.shell.find;
import java.io.IOException;
import java.util.Deque;
import org.apache.hadoop.fs.GlobPattern;
import org.apache.hadoop.fs.shell.PathData;
import org.apache.hadoop.util.StringUtils;
/**
* Implements the -name expression for the
* {@link org.apache.hadoop.fs.shell.find.Find} command.
*/
final class Name extends BaseExpression {
/** Registers this expression with the specified factory. */
public static void registerExpression(ExpressionFactory factory)
throws IOException {
factory.addClass(Name.class, "-name");
factory.addClass(Iname.class, "-iname");
}
private static final String[] USAGE = { "-name pattern", "-iname pattern" };
private static final String[] HELP = {
"Evaluates as true if the basename of the file matches the",
"pattern using standard file system globbing.",
"If -iname is used then the match is case insensitive." };
private GlobPattern globPattern;
private boolean caseSensitive = true;
/** Creates a case sensitive name expression. */
public Name() {
this(true);
}
/**
* Construct a Name {@link Expression} with a specified case sensitivity.
*
* @param caseSensitive if true the comparisons are case sensitive.
*/
private Name(boolean caseSensitive) {
super();
setUsage(USAGE);
setHelp(HELP);
setCaseSensitive(caseSensitive);
}
private void setCaseSensitive(boolean caseSensitive) {
this.caseSensitive = caseSensitive;
}
@Override
public void addArguments(Deque args) {
addArguments(args, 1);
}
@Override
public void prepare() throws IOException {
String argPattern = getArgument(1);
if (!caseSensitive) {
argPattern = StringUtils.toLowerCase(argPattern);
}
globPattern = new GlobPattern(argPattern);
}
@Override
public Result apply(PathData item, int depth) throws IOException {
String name = getPath(item).getName();
if (!caseSensitive) {
name = StringUtils.toLowerCase(name);
}
if (globPattern.matches(name)) {
return Result.PASS;
} else {
return Result.FAIL;
}
}
/** Case insensitive version of the -name expression. */
static class Iname extends FilterExpression {
public Iname() {
super(new Name(false));
}
}
}