org.apache.thrift.transport.TMemoryBuffer.java Source code

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Here is the source code for org.apache.thrift.transport.TMemoryBuffer.java

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/*
 * 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.thrift.transport;

import org.apache.thrift.TByteArrayOutputStream;
import java.nio.charset.Charset;

/**
 * Memory buffer-based implementation of the TTransport interface.
 */
public class TMemoryBuffer extends TTransport {
    /**
     * Create a TMemoryBuffer with an initial buffer size of <i>size</i>. The
     * internal buffer will grow as necessary to accommodate the size of the data
     * being written to it.
     *
     * @param size the initial size of the buffer
     */
    public TMemoryBuffer(int size) {
        arr_ = new TByteArrayOutputStream(size);
    }

    @Override
    public boolean isOpen() {
        return true;
    }

    @Override
    public void open() {
        /* Do nothing */
    }

    @Override
    public void close() {
        /* Do nothing */
    }

    @Override
    public int read(byte[] buf, int off, int len) {
        byte[] src = arr_.get();
        int amtToRead = (len > arr_.len() - pos_ ? arr_.len() - pos_ : len);
        if (amtToRead > 0) {
            System.arraycopy(src, pos_, buf, off, amtToRead);
            pos_ += amtToRead;
        }
        return amtToRead;
    }

    @Override
    public void write(byte[] buf, int off, int len) {
        arr_.write(buf, off, len);
    }

    /**
     * Output the contents of the memory buffer as a String, using the supplied
     * encoding
     * @param charset the encoding to use
     * @return the contents of the memory buffer as a String
     */
    public String toString(Charset charset) {
        return arr_.toString(charset);
    }

    public String inspect() {
        StringBuilder buf = new StringBuilder();
        byte[] bytes = arr_.toByteArray();
        for (int i = 0; i < bytes.length; i++) {
            buf.append(pos_ == i ? "==>" : "").append(Integer.toHexString(bytes[i] & 0xff)).append(" ");
        }
        return buf.toString();
    }

    // The contents of the buffer
    private TByteArrayOutputStream arr_;

    // Position to read next byte from
    private int pos_;

    public int length() {
        return arr_.size();
    }

    public byte[] getArray() {
        return arr_.get();
    }
}