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| package org.apache.tapestry.enhance; |
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| |
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| import java.lang.reflect.Modifier; |
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| import java.util.Iterator; |
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| |
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| import org.apache.hivemind.ErrorLog; |
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| import org.apache.hivemind.Location; |
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| import org.apache.hivemind.service.BodyBuilder; |
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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.IBinding; |
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| import org.apache.tapestry.IComponent; |
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| import org.apache.tapestry.binding.BindingSource; |
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| import org.apache.tapestry.event.PageDetachListener; |
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| import org.apache.tapestry.spec.IComponentSpecification; |
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| import org.apache.tapestry.spec.IPropertySpecification; |
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| public class SpecifiedPropertyWorker implements EnhancementWorker |
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| { |
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| private ErrorLog _errorLog; |
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| |
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| private BindingSource _bindingSource; |
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| public void performEnhancement(EnhancementOperation op, IComponentSpecification spec)
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| { |
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| Iterator i = spec.getPropertySpecificationNames().iterator();
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| |
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| while (i.hasNext())
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| { |
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| String name = (String) i.next();
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| IPropertySpecification ps = spec.getPropertySpecification(name);
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| try
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| { |
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| performEnhancement(op, ps);
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| } |
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| catch (RuntimeException ex) |
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| { |
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| _errorLog.error(
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| EnhanceMessages.errorAddingProperty(name, op.getBaseClass(), ex), |
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| ps.getLocation(), |
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| ex); |
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| } |
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| } |
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| } |
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| |
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| private void performEnhancement(EnhancementOperation op, IPropertySpecification ps)
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| { |
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| Defense.notNull(ps, "ps");
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| String propertyName = ps.getName();
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| String specifiedType = ps.getType();
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| boolean persistent = ps.isPersistent();
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| String initialValue = ps.getInitialValue();
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| Location location = ps.getLocation();
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| addProperty(op, propertyName, specifiedType, persistent, initialValue, location);
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| } |
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| public void addProperty(EnhancementOperation op, String propertyName, String specifiedType,
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| boolean persistent, String initialValue, Location location) |
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| { |
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| Class propertyType = EnhanceUtils.extractPropertyType(op, propertyName, specifiedType);
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| op.claimProperty(propertyName);
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| String field = "_$" + propertyName;
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| op.addField(field, propertyType);
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| EnhanceUtils.createSimpleAccessor(op, field, propertyName, propertyType, location);
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| addMutator(op, propertyName, propertyType, field, persistent, location);
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| if (initialValue == null)
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| addReinitializer(op, propertyType, field);
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| else |
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| addInitialValue(op, propertyName, propertyType, field, initialValue, location);
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| } |
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| private void addReinitializer(EnhancementOperation op, Class propertyType, String fieldName)
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| { |
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| String defaultFieldName = fieldName + "$default";
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| op.addField(defaultFieldName, propertyType);
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| op.extendMethodImplementation(
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| IComponent.class, |
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| EnhanceUtils.FINISH_LOAD_SIGNATURE, |
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| defaultFieldName + " = " + fieldName + ";"); |
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| op.extendMethodImplementation(
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| PageDetachListener.class, |
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| EnhanceUtils.PAGE_DETACHED_SIGNATURE, |
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| fieldName + " = " + defaultFieldName + ";"); |
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| } |
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| |
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| private void addInitialValue(EnhancementOperation op, String propertyName, Class propertyType,
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| String fieldName, String initialValue, Location location) |
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| { |
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| String description = EnhanceMessages.initialValueForProperty(propertyName);
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| InitialValueBindingCreator creator = new InitialValueBindingCreator(_bindingSource,
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| description, initialValue, location); |
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| String creatorField = op.addInjectedField(
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| fieldName + "$initialValueBindingCreator", |
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| InitialValueBindingCreator.class, |
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| creator); |
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| String bindingField = fieldName + "$initialValueBinding";
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| op.addField(bindingField, IBinding.class);
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| BodyBuilder builder = new BodyBuilder();
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| builder.addln("{0} = {1}.createBinding(this);", bindingField, creatorField);
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| op.extendMethodImplementation(IComponent.class, EnhanceUtils.FINISH_LOAD_SIGNATURE, builder
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| .toString()); |
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| builder.clear();
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| builder.addln("{0} = {1};", fieldName, EnhanceUtils.createUnwrapExpression(
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| op, |
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| bindingField, |
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| propertyType)); |
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| String code = builder.toString();
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| op.extendMethodImplementation(IComponent.class, EnhanceUtils.FINISH_LOAD_SIGNATURE, code);
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| op.extendMethodImplementation(
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| PageDetachListener.class, |
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| EnhanceUtils.PAGE_DETACHED_SIGNATURE, |
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| code); |
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| } |
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| private void addMutator(EnhancementOperation op, String propertyName, Class propertyType,
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| String fieldName, boolean persistent, Location location) |
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| { |
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| String methodName = EnhanceUtils.createMutatorMethodName(propertyName);
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| BodyBuilder body = new BodyBuilder();
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| body.begin();
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| if (persistent)
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| { |
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| body.add("org.apache.tapestry.Tapestry#fireObservedChange(this, ");
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| body.addQuoted(propertyName);
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| body.addln(", ($w) $1);");
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| } |
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| body.addln(fieldName + " = $1;");
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| body.end();
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| MethodSignature sig = new MethodSignature(void.class, methodName, new Class[]
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| { propertyType }, null); |
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| op.addMethod(Modifier.PUBLIC, sig, body.toString(), location);
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| } |
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| public void setErrorLog(ErrorLog errorLog)
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| { |
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| _errorLog = errorLog;
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| } |
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| public void setBindingSource(BindingSource bindingSource)
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| { |
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| _bindingSource = bindingSource;
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| } |
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| } |