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package com.sun.grizzly.smart.transformers;
import java.lang.reflect.Field;
import com.sun.grizzly.Buffer;
import com.sun.grizzly.TransformationException;
import com.sun.grizzly.TransformationResult;
import com.sun.grizzly.TransformationResult.Status;
import com.sun.grizzly.Transformer;
import com.sun.grizzly.attributes.Attribute;
import com.sun.grizzly.smart.Reference;
import com.sun.grizzly.smart.SmartTransformer;
import com.sun.grizzly.smart.Value;
import com.sun.grizzly.smart.annotations.Sequence;
import com.sun.grizzly.attributes.AttributeStorage;
/**
*
* @author oleksiys
*/
public abstract class SequenceDecoder extends AbstractSmartMemberDecoder {
protected Sequence config;
protected Class componentType;
protected Transformer componentDecoder;
protected Attribute sequenceAttribute;
private Value size;
private Value limit;
/**
* Creates a sequence object with certain size.
* @param storage attribute storage
* @param size the sequence size
*/
protected abstract E createSequence(AttributeStorage storage, int size);
/**
* Stores an element into the sequence.
* @param storage attribute storage.
* @param sequence sequence object.
* @param component sequence element.
*/
protected abstract void set(AttributeStorage storage, E sequence,
Object component);
/**
* Moves to next sequence element and makes it current.
* Returns true, if there is next elements in sequence,
* or false otherwise.
* @param storage attribute storage.
* @param sequence sequence object.
* @return true, if there is next elements in sequence,
* or false otherwise.
*/
protected abstract boolean next(AttributeStorage storage, E sequence);
/**
* Returns the size of the sequence.
* @param storage attribute storage.
* @param sequence sequence object.
* @return the size of the sequence.
*/
protected abstract int size(AttributeStorage storage, E sequence);
public SequenceDecoder() {
String prefix = getClass().getName();
sequenceAttribute = attributeBuilder.createAttribute(prefix + ".sequence");
}
@Override
public void initialize(SmartTransformer parentTransformer,
Field field) {
super.initialize(parentTransformer, field);
setComponentType(field.getType().getComponentType());
Class prefTransformerClass = null;
Sequence sequence = field.getAnnotation(Sequence.class);
if (sequence != null) {
if (sequence.codec() != null &&
sequence.codec().decoder() != null) {
String prefTransformerClassName =
sequence.codec().decoder();
if (prefTransformerClassName != null &&
prefTransformerClassName.length() > 0) {
try {
prefTransformerClass = (Class)
Class.forName(prefTransformerClassName);
} catch (ClassNotFoundException e) {
throw new IllegalStateException(e);
}
}
}
} else {
throw new IllegalStateException(
"Sequence annotation should be used with array element!");
}
Transformer componentTransformer = parentTransformer.createTransformer(
componentType, prefTransformerClass);
if (componentTransformer == null) {
throw new IllegalStateException(
"Can not find decoder for type: " + componentType);
}
setConfig(sequence);
setComponentDecoder(componentTransformer);
}
public TransformationResult transform(AttributeStorage storage,
Buffer input, E output) throws TransformationException {
if (input == null) {
throw new TransformationException("Input should not be null");
}
E sequence = getSequence(storage);
if (sequence == null) {
int annotatedSize = checkSize(storage);
sequence = createSequence(storage, annotatedSize);
}
while(next(storage, sequence)) {
TransformationResult result = componentDecoder.transform(storage,
input, null);
Status status = result.getStatus();
if (status == Status.COMPLETED) {
componentDecoder.release(storage);
set(storage, sequence, result.getMessage());
} else if (status == Status.INCOMPLED) {
saveState(storage, sequence, incompletedResult);
return incompletedResult;
} else {
return result;
}
}
TransformationResult result = new TransformationResult(
Status.COMPLETED, sequence);
saveState(storage, sequence, result);
return result;
}
@Override
public void release(AttributeStorage storage) {
sequenceAttribute.remove(storage);
super.release(storage);
}
public Class getComponentType() {
return componentType;
}
public void setComponentType(Class componentClass) {
this.componentType = componentClass;
}
public Transformer getComponentDecoder() {
return componentDecoder;
}
public void setComponentDecoder(Transformer elementDecoder) {
this.componentDecoder = elementDecoder;
}
public Sequence getConfig() {
return config;
}
public void setConfig(Sequence config) {
this.config = config;
}
/**
* Save the transformer state.
* @param storage attribute storage
*/
protected void saveState(AttributeStorage storage,
E sequence, TransformationResult lastResult) {
sequenceAttribute.set(storage, sequence);
lastResultAttribute.set(storage, lastResult);
}
/**
* Returns the processing sequence object
* @param storage attribute storage
* @return the processing sequence object
*/
protected E getSequence(AttributeStorage storage) {
return sequenceAttribute.get(storage);
}
protected int checkSize(AttributeStorage storage) {
int annotatedSize = getAnnotatedSize(storage);
if (annotatedSize >= 0) {
int annotatedLimit = getAnnotatedLimit(storage);
if (annotatedLimit > -1) {
if (annotatedSize > annotatedLimit) {
throw new TransformationException("Size " + annotatedSize +
" is bigger than limit " + annotatedLimit);
}
}
} else {
throw new TransformationException("The array size is not defined");
}
return annotatedSize;
}
protected int getAnnotatedSize(AttributeStorage storage) {
Object message = null;
if (size == null) {
String configSize = config.size();
if (configSize == null) {
return -1;
}
try {
int value = Integer.parseInt(configSize);
size = new Value(value);
} catch (NumberFormatException e) {
message = getCurrentMessageProcessingObject(storage);
size = new Value(new Reference(message.getClass(), configSize));
}
}
Integer directValue = (Integer) size.get();
if (directValue != null) {
return directValue;
} else {
try {
if (message == null) {
message = getCurrentMessageProcessingObject(storage);
}
return size.getByReference(message).intValue();
} catch (Exception e) {
return -1;
}
}
}
protected int getAnnotatedLimit(AttributeStorage storage) {
Object message = null;
if (limit == null) {
String configLimit = config.limit();
if (configLimit == null) {
return -1;
}
try {
int value = Integer.parseInt(configLimit);
limit = new Value(value);
} catch (NumberFormatException e) {
message = getCurrentMessageProcessingObject(storage);
limit = new Value(new Reference(message.getClass(), configLimit));
}
}
Integer directValue = (Integer) limit.get();
if (directValue != null) {
return directValue;
} else {
try {
if (message == null) {
message = getCurrentMessageProcessingObject(storage);
}
return limit.getByReference(message).intValue();
} catch (Exception e) {
return -1;
}
}
}
}
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