hadoop FilterExpression 源码
haddop FilterExpression 代码
文件路径:/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/find/FilterExpression.java
/**
* 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.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.shell.PathData;
/**
* Provides an abstract composition filter for the {@link Expression} interface.
* Allows other {@link Expression} implementations to be reused without
* inheritance.
*/
public abstract class FilterExpression implements Expression, Configurable {
protected Expression expression;
protected FilterExpression(Expression expression) {
this.expression = expression;
}
@Override
public void setOptions(FindOptions options) throws IOException {
if (expression != null) {
expression.setOptions(options);
}
}
@Override
public void prepare() throws IOException {
if (expression != null) {
expression.prepare();
}
}
@Override
public Result apply(PathData item, int depth) throws IOException {
if (expression != null) {
return expression.apply(item, -1);
}
return Result.PASS;
}
@Override
public void finish() throws IOException {
if (expression != null) {
expression.finish();
}
}
@Override
public String[] getUsage() {
if (expression != null) {
return expression.getUsage();
}
return null;
}
@Override
public String[] getHelp() {
if (expression != null) {
return expression.getHelp();
}
return null;
}
@Override
public boolean isAction() {
if (expression != null) {
return expression.isAction();
}
return false;
}
@Override
public boolean isOperator() {
if (expression != null) {
return expression.isOperator();
}
return false;
}
@Override
public int getPrecedence() {
if (expression != null) {
return expression.getPrecedence();
}
return -1;
}
@Override
public void addChildren(Deque<Expression> expressions) {
if (expression != null) {
expression.addChildren(expressions);
}
}
@Override
public void addArguments(Deque<String> args) {
if (expression != null) {
expression.addArguments(args);
}
}
@Override
public void setConf(Configuration conf) {
if (expression instanceof Configurable) {
((Configurable) expression).setConf(conf);
}
}
@Override
public Configuration getConf() {
if (expression instanceof Configurable) {
return ((Configurable) expression).getConf();
}
return null;
}
@Override
public String toString() {
if (expression != null) {
return getClass().getSimpleName() + "-" + expression.toString();
}
return getClass().getSimpleName();
}
}
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