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LineRecorder.java
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/
LineRecorder.java
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/* Copyright 2019 Pascal Christoph (hbz)
*
* 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 org.metafacture.strings;
import org.metafacture.framework.FluxCommand;
import org.metafacture.framework.ObjectReceiver;
import org.metafacture.framework.annotations.Description;
import org.metafacture.framework.annotations.In;
import org.metafacture.framework.annotations.Out;
import org.metafacture.framework.helpers.DefaultObjectPipe;
/**
* Collects strings and emits them as records when a line matches the pattern.
* Appends to every incoming line a line feed so that the original structure is
* preserved.
*
* @author Pascal Christoph (dr0i).
*
*/
@Description("Collects strings and emits them as records when a line matches the pattern or the stream is closed.")
@In(String.class)
@Out(String.class)
@FluxCommand("lines-to-records")
public final class LineRecorder extends DefaultObjectPipe<String, ObjectReceiver<String>> {
private static final int SB_CAPACITY = 4096 * 7;
// empty line is the default
private String recordMarkerRegexp = "^\\s*$";
private StringBuilder record = new StringBuilder(SB_CAPACITY);
private ObjectReceiver<String> receiver;
private boolean isClosed;
/**
* Creates an instance of {@link LineRecorder}.
*/
public LineRecorder() {
}
/**
* Sets the record marker regexp.
*
* @param regexp the regexp
*/
public void setRecordMarkerRegexp(final String regexp) {
recordMarkerRegexp = regexp;
}
@Override
public void process(final String line) {
assert !isClosed();
if (line.matches(recordMarkerRegexp)) {
getReceiver().process(record.toString());
record = new StringBuilder(SB_CAPACITY);
}
else {
record.append(line + "\n");
}
}
@Override
protected void onCloseStream() {
if (record.length() > 0) {
getReceiver().process(record.toString());
}
}
@Override
protected void onResetStream() {
record = new StringBuilder(SB_CAPACITY);
}
}