Example usage for java.util ArrayDeque pop

Introduction

In this page you can find the example usage for java.util ArrayDeque pop.

Prototype

public E pop() 

Source Link

Document

Pops an element from the stack represented by this deque.

Usage

From source file:stroom.util.StreamGrepTool.java

private void processFile(final StreamStore streamStore, final long streamId, final String match) {
    try {//  w ww  .ja  v  a2 s.c o  m
        final StreamSource streamSource = streamStore.openStreamSource(streamId);
        if (streamSource != null) {
            final InputStream inputStream = streamSource.getInputStream();

            // Build up 2 buffers so we can output the content either side
            // of
            // the matching line
            final ArrayDeque<String> preBuffer = new ArrayDeque<>();
            final ArrayDeque<String> postBuffer = new ArrayDeque<>();

            final LineNumberReader lineNumberReader = new LineNumberReader(
                    new InputStreamReader(inputStream, StreamUtil.DEFAULT_CHARSET));

            String aline = null;
            while ((aline = lineNumberReader.readLine()) != null) {
                String lines[] = new String[] { aline };
                if (addLineBreak != null) {
                    lines = aline.split(addLineBreak);

                }

                for (final String line : lines) {
                    if (match == null) {
                        System.out.println(lineNumberReader.getLineNumber() + ":" + line);
                    } else {
                        postBuffer.add(lineNumberReader.getLineNumber() + ":" + line);

                        if (postBuffer.size() > 5) {
                            final String searchLine = postBuffer.pop();

                            checkMatch(match, preBuffer, postBuffer, searchLine);

                            preBuffer.add(searchLine);

                            if (preBuffer.size() > 5) {
                                preBuffer.pop();
                            }
                        }
                    }
                }

            }

            // Look at the end
            while (postBuffer.size() > 0) {
                final String searchLine = postBuffer.pop();

                checkMatch(match, preBuffer, postBuffer, searchLine);

                preBuffer.add(searchLine);

                if (preBuffer.size() > 5) {
                    preBuffer.pop();
                }
            }

            inputStream.close();
            streamStore.closeStreamSource(streamSource);
        }
    } catch (final Exception ex) {
        ex.printStackTrace();
    }

}

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