/**
* 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.gateway.filter.rewrite.impl.javascript;
import org.apache.hadoop.gateway.filter.rewrite.api.UrlRewriteFilterContentDescriptor;
import org.apache.hadoop.gateway.filter.rewrite.api.UrlRewriteFilterPathDescriptor;
import org.apache.hadoop.gateway.filter.rewrite.i18n.UrlRewriteMessages;
import org.apache.hadoop.gateway.filter.rewrite.impl.UrlRewriteFilterReader;
import org.apache.hadoop.gateway.filter.rewrite.impl.UrlRewriteUtil;
import org.apache.hadoop.gateway.i18n.messages.MessagesFactory;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;
import java.io.StringWriter;
import java.util.regex.Pattern;
public abstract class JavaScriptFilterReader extends Reader implements UrlRewriteFilterReader {
private static final UrlRewriteFilterPathDescriptor.Compiler<Pattern> REGEX_COMPILER = new RegexCompiler();
private static final UrlRewriteMessages LOG = MessagesFactory.get( UrlRewriteMessages.class );
private BufferedReader reader;
private int offset;
private StringWriter writer;
private StringBuffer buffer;
private UrlRewriteFilterContentDescriptor config;
protected JavaScriptFilterReader( Reader reader, UrlRewriteFilterContentDescriptor config ) throws IOException {
this.reader = new BufferedReader( reader );
this.config = config;
writer = new StringWriter();
buffer = writer.getBuffer();
offset = 0;
}
@Override
public abstract String filterValueString( String name, String value, String rule );
@Override
public int read( char[] destBuffer, int destOffset, int destCount ) throws IOException {
int count = 0;
int available = buffer.length() - offset;
String cbuff;
if( available == 0 ) {
cbuff = reader.readLine();
if( cbuff != null ) {
count = cbuff.length();
writer.write( UrlRewriteUtil.filterJavaScript( cbuff, config, this, REGEX_COMPILER ) );
writer.write( '\n' );
available = buffer.length() - offset;
} else {
count = -1;
}
}
if( available > 0 ) {
count = Math.min( destCount, available );
buffer.getChars( offset, offset + count, destBuffer, destOffset );
offset += count;
if( offset == buffer.length() ) {
offset = 0;
buffer.setLength( 0 );
}
}
return count;
}
@Override
public void close() throws IOException {
reader.close();
writer.close();
}
}