Example usage for java.io DataInput readChar

Introduction

In this page you can find the example usage for java.io DataInput readChar.

Prototype

char readChar() throws IOException;

Source Link

Document

Reads two input bytes and returns a char value.

Usage

From source file:RandomFileTest.java

public static String readFixedString(int size, DataInput dataInput) throws IOException {
    StringBuffer strBuffer = new StringBuffer(size);
    int count = 0;
    boolean more = true;
    while (more && count < size) {
        char aChar = dataInput.readChar();
        count++;/*  w w w  .j a  v a2  s.co m*/
        if (aChar == 0)
            more = false;
        else
            strBuffer.append(aChar);
    }
    dataInput.skipBytes(2 * (size - count));
    return strBuffer.toString();
}

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From source file:RandomFileTest.java

public static String readFixedString(int size, DataInput in) throws IOException {
    StringBuilder b = new StringBuilder(size);
    int i = 0;/*from  ww  w.ja v a 2 s  .  c  o  m*/
    boolean more = true;
    while (more && i < size) {
        char ch = in.readChar();
        i++;
        if (ch == 0)
            more = false;
        else
            b.append(ch);
    }
    in.skipBytes(2 * (size - i));
    return b.toString();
}

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From source file:org.apache.geode.internal.InternalDataSerializer.java

/**
 * Reads an instance of {@code String} from a {@code DataInput} given the header byte already
 * being read. The return value may be {@code null}.
 *
 * @throws IOException A problem occurs while reading from {@code in}
 *
 * @since GemFire 5.7//from   www .j a  v a  2s.co m
 */
public static String readString(DataInput in, byte header) throws IOException {
    if (header == DSCODE.STRING_BYTES) {
        int len = in.readUnsignedShort();
        if (logger.isTraceEnabled(LogMarker.SERIALIZER)) {
            logger.trace(LogMarker.SERIALIZER, "Reading STRING_BYTES of len={}", len);
        }
        byte[] buf = new byte[len];
        in.readFully(buf, 0, len);
        return new String(buf, 0); // intentionally using deprecated constructor
    } else if (header == DSCODE.STRING) {
        if (logger.isTraceEnabled(LogMarker.SERIALIZER)) {
            logger.trace(LogMarker.SERIALIZER, "Reading utf STRING");
        }
        return in.readUTF();
    } else if (header == DSCODE.NULL_STRING) {
        if (logger.isTraceEnabled(LogMarker.SERIALIZER)) {
            logger.trace(LogMarker.SERIALIZER, "Reading NULL_STRING");
        }
        return null;
    } else if (header == DSCODE.HUGE_STRING_BYTES) {
        int len = in.readInt();
        if (logger.isTraceEnabled(LogMarker.SERIALIZER)) {
            logger.trace(LogMarker.SERIALIZER, "Reading HUGE_STRING_BYTES of len={}", len);
        }
        byte[] buf = new byte[len];
        in.readFully(buf, 0, len);
        return new String(buf, 0); // intentionally using deprecated constructor
    } else if (header == DSCODE.HUGE_STRING) {
        int len = in.readInt();
        if (logger.isTraceEnabled(LogMarker.SERIALIZER)) {
            logger.trace(LogMarker.SERIALIZER, "Reading HUGE_STRING of len={}", len);
        }
        char[] buf = new char[len];
        for (int i = 0; i < len; i++) {
            buf[i] = in.readChar();
        }
        return new String(buf);
    } else {
        String s = "Unknown String header " + header;
        throw new IOException(s);
    }
}

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From source file:org.apache.hadoop.chukwa.analysis.salsa.fsm.FSMIntermedEntry.java

public void readFields(DataInput in) throws IOException {
    int currlen, numkeys;

    this.state_type = new StateType(in.readInt());
    this.state_mapred = new MapRedState(in.readInt());
    this.state_hdfs = new HDFSState(in.readInt());
    this.fsm_type = new FSMType(in.readInt());
    in.readChar();

    currlen = in.readInt();/*from  w w w .j a  va  2s  .  c om*/
    if (currlen > 0)
        this.state_name = in.readUTF();
    else
        this.state_name = "";

    currlen = in.readInt();
    if (currlen > 0)
        this.unique_id = in.readUTF();
    else
        this.unique_id = "";

    currlen = in.readInt();
    if (currlen > 0)
        this.timestamp = in.readUTF();
    else
        this.timestamp = "";

    currlen = in.readInt();
    if (currlen > 0)
        this.time_start = in.readUTF();
    else
        this.time_start = "";

    currlen = in.readInt();
    if (currlen > 0)
        this.time_end = in.readUTF();
    else
        this.time_end = "";

    currlen = in.readInt();
    if (currlen > 0)
        this.host_exec = in.readUTF();
    else
        this.host_exec = "";

    currlen = in.readInt();
    if (currlen > 0)
        this.host_other = in.readUTF();
    else
        this.host_other = "";

    currlen = in.readInt();
    if (currlen > 0)
        this.time_orig_epoch = in.readUTF();
    else
        this.time_orig_epoch = "";

    currlen = in.readInt();
    if (currlen > 0)
        this.time_orig = in.readUTF();
    else
        this.time_orig = "";

    currlen = in.readInt();
    if (currlen > 0)
        this.job_id = in.readUTF();
    else
        this.job_id = "";

    currlen = in.readInt();
    if (currlen > 0)
        this.identifier = in.readUTF();
    else
        this.identifier = "";

    numkeys = in.readInt();

    this.add_info = new TreeMap<String, String>();

    if (numkeys > 0) {
        for (int i = 0; i < numkeys; i++) {
            String currkey, currval;
            currkey = in.readUTF();
            currlen = in.readInt();
            if (currlen > 0) {
                currval = in.readUTF();
                this.add_info.put(currkey, currval);
            }
        }
    }
}

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From source file:org.apache.hadoop.hbase.io.HbaseObjectWritable.java

/**
 * Read a {@link Writable}, {@link String}, primitive type, or an array of
 * the preceding./*www . j  av  a  2 s.c o  m*/
 * @param in
 * @param objectWritable
 * @param conf
 * @return the object
 * @throws IOException
 */
@SuppressWarnings("unchecked")
public static Object readObject(DataInput in, HbaseObjectWritable objectWritable, Configuration conf)
        throws IOException {
    Class<?> declaredClass = CODE_TO_CLASS.get(WritableUtils.readVInt(in));
    Object instance;
    if (declaredClass.isPrimitive()) { // primitive types
        if (declaredClass == Boolean.TYPE) { // boolean
            instance = Boolean.valueOf(in.readBoolean());
        } else if (declaredClass == Character.TYPE) { // char
            instance = Character.valueOf(in.readChar());
        } else if (declaredClass == Byte.TYPE) { // byte
            instance = Byte.valueOf(in.readByte());
        } else if (declaredClass == Short.TYPE) { // short
            instance = Short.valueOf(in.readShort());
        } else if (declaredClass == Integer.TYPE) { // int
            instance = Integer.valueOf(in.readInt());
        } else if (declaredClass == Long.TYPE) { // long
            instance = Long.valueOf(in.readLong());
        } else if (declaredClass == Float.TYPE) { // float
            instance = Float.valueOf(in.readFloat());
        } else if (declaredClass == Double.TYPE) { // double
            instance = Double.valueOf(in.readDouble());
        } else if (declaredClass == Void.TYPE) { // void
            instance = null;
        } else {
            throw new IllegalArgumentException("Not a primitive: " + declaredClass);
        }
    } else if (declaredClass.isArray()) { // array
        if (declaredClass.equals(byte[].class)) {
            instance = Bytes.readByteArray(in);
        } else if (declaredClass.equals(Result[].class)) {
            instance = Result.readArray(in);
        } else {
            int length = in.readInt();
            instance = Array.newInstance(declaredClass.getComponentType(), length);
            for (int i = 0; i < length; i++) {
                Array.set(instance, i, readObject(in, conf));
            }
        }
    } else if (declaredClass.equals(Array.class)) { //an array not declared in CLASS_TO_CODE
        Class<?> componentType = readClass(conf, in);
        int length = in.readInt();
        instance = Array.newInstance(componentType, length);
        for (int i = 0; i < length; i++) {
            Array.set(instance, i, readObject(in, conf));
        }
    } else if (List.class.isAssignableFrom(declaredClass)) { // List
        int length = in.readInt();
        instance = new ArrayList(length);
        for (int i = 0; i < length; i++) {
            ((ArrayList) instance).add(readObject(in, conf));
        }
    } else if (declaredClass == String.class) { // String
        instance = Text.readString(in);
    } else if (declaredClass.isEnum()) { // enum
        instance = Enum.valueOf((Class<? extends Enum>) declaredClass, Text.readString(in));
    } else if (declaredClass == Message.class) {
        String className = Text.readString(in);
        try {
            declaredClass = getClassByName(conf, className);
            instance = tryInstantiateProtobuf(declaredClass, in);
        } catch (ClassNotFoundException e) {
            LOG.error("Can't find class " + className, e);
            throw new IOException("Can't find class " + className, e);
        }
    } else { // Writable or Serializable
        Class instanceClass = null;
        int b = (byte) WritableUtils.readVInt(in);
        if (b == NOT_ENCODED) {
            String className = Text.readString(in);
            try {
                instanceClass = getClassByName(conf, className);
            } catch (ClassNotFoundException e) {
                LOG.error("Can't find class " + className, e);
                throw new IOException("Can't find class " + className, e);
            }
        } else {
            instanceClass = CODE_TO_CLASS.get(b);
        }
        if (Writable.class.isAssignableFrom(instanceClass)) {
            Writable writable = WritableFactories.newInstance(instanceClass, conf);
            try {
                writable.readFields(in);
            } catch (Exception e) {
                LOG.error("Error in readFields", e);
                throw new IOException("Error in readFields", e);
            }
            instance = writable;
            if (instanceClass == NullInstance.class) { // null
                declaredClass = ((NullInstance) instance).declaredClass;
                instance = null;
            }
        } else {
            int length = in.readInt();
            byte[] objectBytes = new byte[length];
            in.readFully(objectBytes);
            ByteArrayInputStream bis = null;
            ObjectInputStream ois = null;
            try {
                bis = new ByteArrayInputStream(objectBytes);
                ois = new ObjectInputStream(bis);
                instance = ois.readObject();
            } catch (ClassNotFoundException e) {
                LOG.error("Class not found when attempting to deserialize object", e);
                throw new IOException("Class not found when attempting to " + "deserialize object", e);
            } finally {
                if (bis != null)
                    bis.close();
                if (ois != null)
                    ois.close();
            }
        }
    }
    if (objectWritable != null) { // store values
        objectWritable.declaredClass = declaredClass;
        objectWritable.instance = instance;
    }
    return instance;
}

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From source file:org.apache.hadoop.hbase.security.access.HbaseObjectWritableFor96Migration.java

/**
 * Read a {@link Writable}, {@link String}, primitive type, or an array of
 * the preceding./*ww  w. ja  va2  s.c o m*/
 * @param in
 * @param objectWritable
 * @param conf
 * @return the object
 * @throws IOException
 */
@SuppressWarnings("unchecked")
static Object readObject(DataInput in, HbaseObjectWritableFor96Migration objectWritable, Configuration conf)
        throws IOException {
    Class<?> declaredClass = CODE_TO_CLASS.get(WritableUtils.readVInt(in));
    Object instance;
    if (declaredClass.isPrimitive()) { // primitive types
        if (declaredClass == Boolean.TYPE) { // boolean
            instance = Boolean.valueOf(in.readBoolean());
        } else if (declaredClass == Character.TYPE) { // char
            instance = Character.valueOf(in.readChar());
        } else if (declaredClass == Byte.TYPE) { // byte
            instance = Byte.valueOf(in.readByte());
        } else if (declaredClass == Short.TYPE) { // short
            instance = Short.valueOf(in.readShort());
        } else if (declaredClass == Integer.TYPE) { // int
            instance = Integer.valueOf(in.readInt());
        } else if (declaredClass == Long.TYPE) { // long
            instance = Long.valueOf(in.readLong());
        } else if (declaredClass == Float.TYPE) { // float
            instance = Float.valueOf(in.readFloat());
        } else if (declaredClass == Double.TYPE) { // double
            instance = Double.valueOf(in.readDouble());
        } else if (declaredClass == Void.TYPE) { // void
            instance = null;
        } else {
            throw new IllegalArgumentException("Not a primitive: " + declaredClass);
        }
    } else if (declaredClass.isArray()) { // array
        if (declaredClass.equals(byte[].class)) {
            instance = Bytes.readByteArray(in);
        } else {
            int length = in.readInt();
            instance = Array.newInstance(declaredClass.getComponentType(), length);
            for (int i = 0; i < length; i++) {
                Array.set(instance, i, readObject(in, conf));
            }
        }
    } else if (declaredClass.equals(Array.class)) { //an array not declared in CLASS_TO_CODE
        Class<?> componentType = readClass(conf, in);
        int length = in.readInt();
        instance = Array.newInstance(componentType, length);
        for (int i = 0; i < length; i++) {
            Array.set(instance, i, readObject(in, conf));
        }
    } else if (List.class.isAssignableFrom(declaredClass)) { // List
        int length = in.readInt();
        instance = new ArrayList(length);
        for (int i = 0; i < length; i++) {
            ((ArrayList) instance).add(readObject(in, conf));
        }
    } else if (declaredClass == String.class) { // String
        instance = Text.readString(in);
    } else if (declaredClass.isEnum()) { // enum
        instance = Enum.valueOf((Class<? extends Enum>) declaredClass, Text.readString(in));
    } else if (declaredClass == Message.class) {
        String className = Text.readString(in);
        try {
            declaredClass = getClassByName(conf, className);
            instance = tryInstantiateProtobuf(declaredClass, in);
        } catch (ClassNotFoundException e) {
            LOG.error("Can't find class " + className, e);
            throw new IOException("Can't find class " + className, e);
        }
    } else if (Scan.class.isAssignableFrom(declaredClass)) {
        int length = in.readInt();
        byte[] scanBytes = new byte[length];
        in.readFully(scanBytes);
        ClientProtos.Scan.Builder scanProto = ClientProtos.Scan.newBuilder();
        instance = ProtobufUtil.toScan(scanProto.mergeFrom(scanBytes).build());
    } else { // Writable or Serializable
        Class instanceClass = null;
        int b = (byte) WritableUtils.readVInt(in);
        if (b == NOT_ENCODED) {
            String className = Text.readString(in);
            try {
                instanceClass = getClassByName(conf, className);
            } catch (ClassNotFoundException e) {
                LOG.error("Can't find class " + className, e);
                throw new IOException("Can't find class " + className, e);
            }
        } else {
            instanceClass = CODE_TO_CLASS.get(b);
        }
        if (Writable.class.isAssignableFrom(instanceClass)) {
            Writable writable = WritableFactories.newInstance(instanceClass, conf);
            try {
                writable.readFields(in);
            } catch (Exception e) {
                LOG.error("Error in readFields", e);
                throw new IOException("Error in readFields", e);
            }
            instance = writable;
            if (instanceClass == NullInstance.class) { // null
                declaredClass = ((NullInstance) instance).declaredClass;
                instance = null;
            }
        } else {
            int length = in.readInt();
            byte[] objectBytes = new byte[length];
            in.readFully(objectBytes);
            ByteArrayInputStream bis = null;
            ObjectInputStream ois = null;
            try {
                bis = new ByteArrayInputStream(objectBytes);
                ois = new ObjectInputStream(bis);
                instance = ois.readObject();
            } catch (ClassNotFoundException e) {
                LOG.error("Class not found when attempting to deserialize object", e);
                throw new IOException("Class not found when attempting to " + "deserialize object", e);
            } finally {
                if (bis != null)
                    bis.close();
                if (ois != null)
                    ois.close();
            }
        }
    }
    if (objectWritable != null) { // store values
        objectWritable.declaredClass = declaredClass;
        objectWritable.instance = instance;
    }
    return instance;
}

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From source file:org.cloudata.core.common.io.CObjectWritable.java

/** Read a {@link CWritable}, {@link String}, primitive type, or an array of
 * the preceding. *//*from w ww.  j a  va  2 s . c  o m*/
@SuppressWarnings("unchecked")
public static Object readObject(DataInput in, CObjectWritable objectWritable, CloudataConf conf,
        boolean arrayComponent, Class componentClass) throws IOException {
    String className;
    if (arrayComponent) {
        className = componentClass.getName();
    } else {
        className = CUTF8.readString(in);
        //SANGCHUL
        //   System.out.println("SANGCHUL] className:" + className);
    }

    Class<?> declaredClass = PRIMITIVE_NAMES.get(className);
    if (declaredClass == null) {
        try {
            declaredClass = conf.getClassByName(className);
        } catch (ClassNotFoundException e) {
            //SANGCHUL
            e.printStackTrace();
            throw new RuntimeException("readObject can't find class[className=" + className + "]", e);
        }
    }

    Object instance;

    if (declaredClass.isPrimitive()) { // primitive types

        if (declaredClass == Boolean.TYPE) { // boolean
            instance = Boolean.valueOf(in.readBoolean());
        } else if (declaredClass == Character.TYPE) { // char
            instance = Character.valueOf(in.readChar());
        } else if (declaredClass == Byte.TYPE) { // byte
            instance = Byte.valueOf(in.readByte());
        } else if (declaredClass == Short.TYPE) { // short
            instance = Short.valueOf(in.readShort());
        } else if (declaredClass == Integer.TYPE) { // int
            instance = Integer.valueOf(in.readInt());
        } else if (declaredClass == Long.TYPE) { // long
            instance = Long.valueOf(in.readLong());
        } else if (declaredClass == Float.TYPE) { // float
            instance = Float.valueOf(in.readFloat());
        } else if (declaredClass == Double.TYPE) { // double
            instance = Double.valueOf(in.readDouble());
        } else if (declaredClass == Void.TYPE) { // void
            instance = null;
        } else {
            throw new IllegalArgumentException("Not a primitive: " + declaredClass);
        }

    } else if (declaredClass.isArray()) { // array
        //System.out.println("SANGCHUL] is array");
        int length = in.readInt();
        //System.out.println("SANGCHUL] array length : " + length);
        //System.out.println("Read:in.readInt():" + length);
        if (declaredClass.getComponentType() == Byte.TYPE) {
            byte[] bytes = new byte[length];
            in.readFully(bytes);
            instance = bytes;
        } else if (declaredClass.getComponentType() == ColumnValue.class) {
            instance = readColumnValue(in, conf, declaredClass, length);
        } else {
            Class componentType = declaredClass.getComponentType();

            // SANGCHUL
            //System.out.println("SANGCHUL] componentType : " + componentType.getName());

            instance = Array.newInstance(componentType, length);
            for (int i = 0; i < length; i++) {
                Object arrayComponentInstance = readObject(in, null, conf, !componentType.isArray(),
                        componentType);
                Array.set(instance, i, arrayComponentInstance);
                //Array.set(instance, i, readObject(in, conf));
            }
        }
    } else if (declaredClass == String.class) { // String
        instance = CUTF8.readString(in);
    } else if (declaredClass.isEnum()) { // enum
        instance = Enum.valueOf((Class<? extends Enum>) declaredClass, CUTF8.readString(in));
    } else if (declaredClass == ColumnValue.class) {
        //ColumnValue?  ?? ?? ?  ? ?.
        //? ?   ? ? ? ? . 
        Class instanceClass = null;
        try {
            short typeDiff = in.readShort();
            if (typeDiff == TYPE_DIFF) {
                instanceClass = conf.getClassByName(CUTF8.readString(in));
            } else {
                instanceClass = declaredClass;
            }
        } catch (ClassNotFoundException e) {
            throw new RuntimeException("readObject can't find class", e);
        }
        ColumnValue columnValue = new ColumnValue();
        columnValue.readFields(in);
        instance = columnValue;
    } else { // Writable

        Class instanceClass = null;
        try {
            short typeDiff = in.readShort();
            // SANGCHUL
            //System.out.println("SANGCHUL] typeDiff : " + typeDiff);
            //System.out.println("Read:in.readShort():" + typeDiff);
            if (typeDiff == TYPE_DIFF) {
                // SANGCHUL
                String classNameTemp = CUTF8.readString(in);
                //System.out.println("SANGCHUL] typeDiff : " + classNameTemp);
                instanceClass = conf.getClassByName(classNameTemp);
                //System.out.println("Read:UTF8.readString(in):" + instanceClass.getClass());
            } else {
                instanceClass = declaredClass;
            }
        } catch (ClassNotFoundException e) {

            // SANGCHUL
            e.printStackTrace();
            throw new RuntimeException("readObject can't find class", e);
        }

        CWritable writable = CWritableFactories.newInstance(instanceClass, conf);
        writable.readFields(in);
        //System.out.println("Read:writable.readFields(in)");
        instance = writable;

        if (instanceClass == NullInstance.class) { // null
            declaredClass = ((NullInstance) instance).declaredClass;
            instance = null;
        }
    }

    if (objectWritable != null) { // store values
        objectWritable.declaredClass = declaredClass;
        objectWritable.instance = instance;
    }

    return instance;
}

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