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package org.mule.transformer; |
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import org.mule.DefaultMuleMessage; |
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import org.mule.api.MuleEvent; |
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import org.mule.api.MuleMessage; |
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import org.mule.api.transformer.DataType; |
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import org.mule.api.transformer.MessageTransformer; |
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import org.mule.api.transformer.TransformerException; |
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import org.mule.api.transformer.TransformerMessagingException; |
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import org.mule.config.i18n.CoreMessages; |
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import org.mule.config.i18n.Message; |
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import org.mule.transformer.types.DataTypeFactory; |
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import org.mule.transport.NullPayload; |
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import org.mule.util.ClassUtils; |
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import org.mule.util.StringMessageUtils; |
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40 | 0 | public abstract class AbstractMessageTransformer extends AbstractTransformer implements MessageTransformer |
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{ |
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@Override |
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public boolean isSourceDataTypeSupported(DataType<?> dataType, boolean exactMatch) |
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{ |
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53 | 0 | return (super.isSourceDataTypeSupported(dataType, exactMatch) || MuleMessage.class.isAssignableFrom(dataType.getType())); |
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} |
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@Override |
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public final Object doTransform(Object src, String enc) throws TransformerException |
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{ |
62 | 0 | throw new UnsupportedOperationException(); |
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} |
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@Override |
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public final Object transform(Object src, String enc) throws TransformerException |
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{ |
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try |
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{ |
73 | 0 | return transform(src, enc, null); |
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} |
75 | 0 | catch (TransformerMessagingException e) |
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{ |
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78 | 0 | Throwable cause = e.getCause(); |
79 | 0 | if (cause instanceof TransformerException) |
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{ |
81 | 0 | TransformerException te = (TransformerException) cause; |
82 | 0 | if (te.getTransformer() == this) |
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{ |
84 | 0 | throw te; |
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} |
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} |
87 | 0 | throw new TransformerException(e.getI18nMessage(), this, e); |
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} |
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} |
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public Object transform(Object src, MuleEvent event) throws TransformerMessagingException |
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{ |
100 | 0 | return transform(src, getEncoding(src), event); |
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} |
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public final Object transform(Object src, String enc, MuleEvent event) throws TransformerMessagingException |
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{ |
113 | 0 | DataType<?> sourceType = DataTypeFactory.create(src.getClass()); |
114 | 0 | if (!isSourceDataTypeSupported(sourceType)) |
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{ |
116 | 0 | if (isIgnoreBadInput()) |
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{ |
118 | 0 | logger.debug("Source type is incompatible with this transformer and property 'ignoreBadInput' is set to true, so the transformer chain will continue."); |
119 | 0 | return src; |
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} |
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else |
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{ |
123 | 0 | Message msg = CoreMessages.transformOnObjectUnsupportedTypeOfEndpoint(getName(), |
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src.getClass(), endpoint); |
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126 | 0 | throw new TransformerMessagingException(msg, event, this); |
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} |
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} |
129 | 0 | if (logger.isDebugEnabled()) |
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{ |
131 | 0 | logger.debug(String.format("Applying transformer %s (%s)", getName(), getClass().getName())); |
132 | 0 | logger.debug(String.format("Object before transform: %s", StringMessageUtils.toString(src))); |
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} |
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MuleMessage message; |
136 | 0 | if (src instanceof MuleMessage) |
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{ |
138 | 0 | message = (MuleMessage) src; |
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} |
140 | 0 | else if (muleContext.getConfiguration().isAutoWrapMessageAwareTransform()) |
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{ |
142 | 0 | message = new DefaultMuleMessage(src, muleContext); |
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} |
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else |
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{ |
146 | 0 | if (event == null) |
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{ |
148 | 0 | throw new TransformerMessagingException(CoreMessages.noCurrentEventForTransformer(), event, this); |
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} |
150 | 0 | message = event.getMessage(); |
151 | 0 | if (!message.getPayload().equals(src)) |
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{ |
153 | 0 | throw new IllegalStateException("Transform payload does not match current event"); |
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} |
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} |
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Object result; |
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try |
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{ |
160 | 0 | result = transformMessage(message, enc); |
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} |
162 | 0 | catch (TransformerException e) |
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{ |
164 | 0 | throw new TransformerMessagingException(e.getI18nMessage(), event, this, e); |
165 | 0 | } |
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167 | 0 | if (result == null) |
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{ |
169 | 0 | result = NullPayload.getInstance(); |
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} |
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172 | 0 | if (logger.isDebugEnabled()) |
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{ |
174 | 0 | logger.debug(String.format("Object after transform: %s", StringMessageUtils.toString(result))); |
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} |
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177 | 0 | result = checkReturnClass(result, event); |
178 | 0 | return result; |
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} |
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protected Object checkReturnClass(Object object, MuleEvent event) throws TransformerMessagingException |
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{ |
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192 | 0 | if(object==null || object instanceof NullPayload && isAllowNullReturn()) |
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{ |
194 | 0 | return object; |
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} |
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197 | 0 | if (returnType != null) |
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{ |
199 | 0 | DataType<?> dt = DataTypeFactory.create(object.getClass()); |
200 | 0 | if (!returnType.isCompatibleWith(dt)) |
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{ |
202 | 0 | throw new TransformerMessagingException( |
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CoreMessages.transformUnexpectedType(dt, returnType), |
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event, this); |
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} |
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} |
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208 | 0 | if (logger.isDebugEnabled()) |
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{ |
210 | 0 | logger.debug("The transformed object is of expected type. Type is: " + |
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ClassUtils.getSimpleName(object.getClass())); |
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} |
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214 | 0 | return object; |
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} |
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public abstract Object transformMessage(MuleMessage message, String outputEncoding) throws TransformerException; |
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} |