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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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36 | 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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49 | 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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{ |
58 | 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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{ |
69 | 0 | return transform(src, enc, null); |
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} |
71 | 0 | catch (TransformerMessagingException e) |
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{ |
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74 | 0 | Throwable cause = e.getCause(); |
75 | 0 | if (cause instanceof TransformerException) |
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{ |
77 | 0 | TransformerException te = (TransformerException) cause; |
78 | 0 | if (te.getTransformer() == this) |
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{ |
80 | 0 | throw te; |
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} |
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} |
83 | 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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{ |
89 | 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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{ |
94 | 0 | DataType<?> sourceType = DataTypeFactory.create(src.getClass()); |
95 | 0 | if (!isSourceDataTypeSupported(sourceType)) |
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{ |
97 | 0 | if (isIgnoreBadInput()) |
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{ |
99 | 0 | logger.debug("Source type is incompatible with this transformer and property 'ignoreBadInput' is set to true, so the transformer chain will continue."); |
100 | 0 | return src; |
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} |
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else |
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{ |
104 | 0 | Message msg = CoreMessages.transformOnObjectUnsupportedTypeOfEndpoint(getName(), |
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src.getClass(), endpoint); |
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107 | 0 | throw new TransformerMessagingException(msg, event, this); |
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} |
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} |
110 | 0 | if (logger.isDebugEnabled()) |
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{ |
112 | 0 | logger.debug(String.format("Applying transformer %s (%s)", getName(), getClass().getName())); |
113 | 0 | logger.debug(String.format("Object before transform: %s", StringMessageUtils.toString(src))); |
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} |
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MuleMessage message; |
117 | 0 | if (src instanceof MuleMessage) |
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{ |
119 | 0 | message = (MuleMessage) src; |
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} |
121 | 0 | else if (muleContext.getConfiguration().isAutoWrapMessageAwareTransform()) |
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{ |
123 | 0 | message = new DefaultMuleMessage(src, muleContext); |
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} |
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else |
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{ |
127 | 0 | if (event == null) |
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{ |
129 | 0 | throw new TransformerMessagingException(CoreMessages.noCurrentEventForTransformer(), event, this); |
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} |
131 | 0 | message = event.getMessage(); |
132 | 0 | if (!message.getPayload().equals(src)) |
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{ |
134 | 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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{ |
141 | 0 | result = transformMessage(message, enc); |
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} |
143 | 0 | catch (TransformerException e) |
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{ |
145 | 0 | throw new TransformerMessagingException(e.getI18nMessage(), event, this, e); |
146 | 0 | } |
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148 | 0 | if (result == null) |
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{ |
150 | 0 | result = NullPayload.getInstance(); |
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} |
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153 | 0 | if (logger.isDebugEnabled()) |
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{ |
155 | 0 | logger.debug(String.format("Object after transform: %s", StringMessageUtils.toString(result))); |
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} |
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158 | 0 | result = checkReturnClass(result, event); |
159 | 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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169 | 0 | if(object==null || object instanceof NullPayload && isAllowNullReturn()) |
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{ |
171 | 0 | return object; |
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} |
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174 | 0 | if (returnType != null) |
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{ |
176 | 0 | DataType<?> dt = DataTypeFactory.create(object.getClass()); |
177 | 0 | if (!returnType.isCompatibleWith(dt)) |
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{ |
179 | 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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185 | 0 | if (logger.isDebugEnabled()) |
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{ |
187 | 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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191 | 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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} |