Examples with AlgorithmVersion com.ibm.j9ddr.vm29.j9.AlgorithmVersion used on opensource projects

Example 1 with AlgorithmVersion

use of com.ibm.j9ddr.vm29.j9.AlgorithmVersion in project openj9 by eclipse.

the class J9ObjectHelper method stringValue.

public static String stringValue(J9ObjectPointer objPointer) throws CorruptDataException {
    if (!J9ObjectHelper.getClassName(objPointer).equals("java/lang/String")) {
        throw new IllegalArgumentException();
    }
    // No synchronization needed here because the type of java/lang/String.value is immutable
    if (isStringBackedByByteArray == null) {
        try {
            getObjectField(objPointer, getFieldOffset(objPointer, "value", "[B"));
            isStringBackedByByteArray = new Boolean(true);
        } catch (NoSuchElementException e) {
            getObjectField(objPointer, getFieldOffset(objPointer, "value", "[C"));
            isStringBackedByByteArray = new Boolean(false);
        }
    }
    J9ObjectPointer valueObject = isStringBackedByByteArray.booleanValue() ? getObjectField(objPointer, getFieldOffset(objPointer, "value", "[B")) : getObjectField(objPointer, getFieldOffset(objPointer, "value", "[C"));
    if (valueObject.isNull()) {
        return "<Uninitialized String>";
    }
    int offset = 0;
    int count = getIntField(objPointer, getFieldOffset(objPointer, "count", "I"));
    boolean isStringCompressed = false;
    AlgorithmVersion version = AlgorithmVersion.getVersionOf(AlgorithmVersion.STRING_COMPRESSION_VERSION);
    switch(version.getAlgorithmVersion()) {
        case 1:
            boolean enableCompression = getBooleanField(objPointer, getFieldOffset(objPointer, "enableCompression", "Z"));
            if (enableCompression) {
                if (count >= 0) {
                    isStringCompressed = true;
                } else {
                    count = count & 0x7FFFFFFF;
                }
            }
            break;
        default:
            offset = getIntField(objPointer, getFieldOffset(objPointer, "offset", "I"));
            break;
    }
    char[] charValue = new char[count];
    J9IndexableObjectPointer valueArray = J9IndexableObjectPointer.cast(valueObject);
    if (isStringBackedByByteArray.booleanValue()) {
        byte[] value = (byte[]) J9IndexableObjectHelper.getData(valueArray);
        if (isStringCompressed) {
            for (int i = 0; i < count; ++i) {
                charValue[i] = byteToCharUnsigned(getByteFromArrayByIndex(value, i));
            }
        } else {
            for (int i = 0; i < count; ++i) {
                charValue[i] = getCharFromArrayByIndex(value, i);
            }
        }
    } else {
        char[] value = (char[]) J9IndexableObjectHelper.getData(valueArray);
        if (isStringCompressed) {
            for (int i = 0; i < count; ++i) {
                charValue[i] = byteToCharUnsigned(getByteFromArrayByIndex(value, i));
            }
        } else {
            for (int i = 0; i < count; ++i) {
                charValue[i] = getCharFromArrayByIndex(value, i);
            }
        }
    }
    return new String(charValue, offset, count);
}