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| package org.apache.tapestry.enhance; |
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| import java.lang.reflect.Modifier; |
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| import org.apache.hivemind.ApplicationRuntimeException; |
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| import org.apache.hivemind.Location; |
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| import org.apache.hivemind.service.MethodSignature; |
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| import org.apache.hivemind.util.Defense; |
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| import org.apache.tapestry.services.InjectedValueProvider; |
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| import org.apache.tapestry.spec.InjectSpecification; |
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| public class InjectObjectWorker implements InjectEnhancementWorker |
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| { |
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| private InjectedValueProvider _provider; |
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| |
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| public void performEnhancement(EnhancementOperation op, InjectSpecification is)
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| { |
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| String name = is.getProperty();
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| String objectReference = is.getObject();
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| Location location = is.getLocation();
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| injectObject(op, objectReference, name, location);
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| } |
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| public void injectObject(EnhancementOperation op, String objectReference, String propertyName,
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| Location location) |
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| { |
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| Defense.notNull(op, "op");
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| Defense.notNull(propertyName, "propertyName");
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| Defense.notNull(objectReference, "objectReference");
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| Class propertyType = op.getPropertyType(propertyName);
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| if (propertyType == null)
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| propertyType = Object.class;
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| op.claimReadonlyProperty(propertyName);
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| Object injectedValue = _provider.obtainValue(objectReference, location);
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| if (injectedValue == null)
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| throw new ApplicationRuntimeException(EnhanceMessages
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| .locatedValueIsNull(objectReference), location, null); |
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| |
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| if (!propertyType.isAssignableFrom(injectedValue.getClass()))
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| throw new ApplicationRuntimeException(EnhanceMessages.incompatibleInjectType(
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| objectReference, |
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| injectedValue, |
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| propertyType), location, null); |
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| String fieldName = op.addInjectedField("_$" + propertyName, propertyType, injectedValue);
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| String methodName = EnhanceUtils.createAccessorMethodName(propertyName);
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| op.addMethod(
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| Modifier.PUBLIC, |
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| new MethodSignature(propertyType, methodName, null, null), |
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| "return " + fieldName + ";", location); |
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| } |
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| public void setProvider(InjectedValueProvider provider)
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| { |
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| _provider = provider;
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| } |
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| } |