org.apache.lucene.util.ReaderClonerDefaultImpl Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch-analysis-combo Show documentation
Show all versions of elasticsearch-analysis-combo Show documentation
The Combo Analyzer plugin for ElasticSearch provides with a new analyzer type that combines the output of multiple analyzers into one.
The newest version!
/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.lucene.util;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
/**
* Default, memory costly but generic implementation of a {@link java.io.Reader} duplicator.
*
* This implementation makes no assumption on the initial Reader.
* Therefore, only the read() functions are available to figure out
* what was the original content provided to the initial Reader.
*
* After having read and filled a buffer with the whole content,
* a String-based Reader implementation will be used and returned.
*
* This implementation is memory costly because the initial content is
* forcefully duplicated once. Moreover, buffer size growth may cost
* some more memory too.
*
* @author ofavre
*/
public class ReaderClonerDefaultImpl implements ReaderCloneFactory.ReaderCloner {
public static final int DEFAULT_INITIAL_CAPACITY = 64 * 1024;
public static final int DEFAULT_READ_BUFFER_SIZE = 16 * 1024;
protected int initialCapacity;
protected int readBufferSize;
private String originalContent;
public ReaderClonerDefaultImpl() {
this(DEFAULT_INITIAL_CAPACITY, DEFAULT_READ_BUFFER_SIZE);
}
public ReaderClonerDefaultImpl(int initialCapacity) {
this(initialCapacity, DEFAULT_READ_BUFFER_SIZE);
}
/**
* Extracts the original content from a generic Reader instance
* by repeatedly calling {@link Reader#read(char[])} on it,
* feeding a {@link StringBuilder}.
*
* @param initialCapacity Initial StringBuilder capacity
* @param readBufferSize Size of the char[] read buffer at each read() call
*/
public ReaderClonerDefaultImpl(int initialCapacity, int readBufferSize) {
this.initialCapacity = initialCapacity;
this.readBufferSize = readBufferSize;
}
public void init(Reader originalReader) throws IOException {
this.originalContent = null;
StringBuilder sb;
if (initialCapacity < 0)
sb = new StringBuilder();
else
sb = new StringBuilder(initialCapacity);
char[] buffer = new char[readBufferSize];
int read;
while((read = originalReader.read(buffer)) != -1){
sb.append(buffer, 0, read);
}
this.originalContent = sb.toString();
originalReader.close();
}
/**
* Returns a new {@link StringReader} instance,
* directly based on the extracted original content.
* @return A {@link StringReader}
*/
@Override public Reader giveAClone() {
return new StringReader(originalContent);
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy