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package org.apache.tapestry.enhance; |
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import org.apache.hivemind.ApplicationRuntimeException; |
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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.ClassFabUtils; |
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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.spec.IComponentSpecification; |
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import org.apache.tapestry.spec.IParameterSpecification; |
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import java.lang.reflect.Modifier; |
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import java.util.Iterator; |
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public class ParameterPropertyWorker implements EnhancementWorker |
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{ |
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private ErrorLog _errorLog; |
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public void performEnhancement(EnhancementOperation op, IComponentSpecification spec) |
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{ |
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Iterator i = spec.getParameterNames().iterator(); |
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while(i.hasNext()) |
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{ |
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String name = (String) i.next(); |
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IParameterSpecification ps = spec.getParameter(name); |
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try |
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{ |
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performEnhancement(op, name, ps); |
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} |
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catch (RuntimeException ex) |
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{ |
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_errorLog.error(EnhanceMessages.errorAddingProperty(ps.getPropertyName(), op.getBaseClass(), ex), |
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ps.getLocation(), ex); |
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} |
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} |
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} |
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private void performEnhancement(EnhancementOperation op, String parameterName, IParameterSpecification ps) |
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{ |
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if (!parameterName.equals(ps.getParameterName())) |
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return; |
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String propertyName = ps.getPropertyName(); |
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String specifiedType = ps.getType(); |
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boolean cache = ps.getCache(); |
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addParameter(op, parameterName, propertyName, specifiedType, cache, ps.getLocation()); |
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} |
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public void addParameter(EnhancementOperation op, String parameterName, |
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String propertyName, String specifiedType, boolean cache, |
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Location location) |
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{ |
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Defense.notNull(op, "op"); |
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Defense.notNull(parameterName, "parameterName"); |
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Defense.notNull(propertyName, "propertyName"); |
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Class propertyType = EnhanceUtils.extractPropertyType(op, propertyName, specifiedType); |
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op.claimProperty(propertyName); |
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String fieldName = "_$" + propertyName; |
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String defaultFieldName = fieldName + "$Default"; |
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String cachedFieldName = fieldName + "$Cached"; |
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op.addField(fieldName, propertyType); |
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op.addField(defaultFieldName, propertyType); |
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op.addField(cachedFieldName, boolean.class); |
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String bindingFieldName = buildBindingAccessor(op, fieldName, parameterName, location); |
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buildAccessor(op, propertyName, propertyType, fieldName, |
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defaultFieldName, cachedFieldName, bindingFieldName, |
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cache, location); |
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buildMutator(op, parameterName, propertyName, propertyType, fieldName, |
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defaultFieldName, cachedFieldName, bindingFieldName, location); |
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extendCleanupAfterRender(op, bindingFieldName, fieldName, defaultFieldName, cachedFieldName); |
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} |
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String buildBindingAccessor(EnhancementOperation op, String fieldName, String parameterName, Location location) |
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{ |
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BodyBuilder body = new BodyBuilder(); |
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body.begin(); |
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String bindingFieldName = fieldName + "$Binding"; |
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op.addField(bindingFieldName, IBinding.class); |
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body.addln("if ({0} == null)", bindingFieldName); |
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body.begin(); |
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body.addln("{0} = getBinding(\"{1}\");", bindingFieldName, parameterName); |
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body.end(); |
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body.addln("return {0};", bindingFieldName); |
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body.end(); |
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String methodName = EnhanceUtils.createAccessorMethodName(bindingFieldName); |
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op.addMethod(Modifier.PUBLIC, |
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new MethodSignature(IBinding.class, methodName, new Class[0], null), |
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body.toString(), location); |
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return methodName + "()"; |
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} |
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void extendCleanupAfterRender(EnhancementOperation op, String bindingFieldName, |
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String fieldName, String defaultFieldName, String cachedFieldName) |
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{ |
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BodyBuilder cleanupBody = new BodyBuilder(); |
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cleanupBody.addln("if ({0} && ! {1}.isInvariant())", cachedFieldName, bindingFieldName); |
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cleanupBody.begin(); |
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cleanupBody.addln("{0} = false;", cachedFieldName); |
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cleanupBody.addln("{0} = {1};", fieldName, defaultFieldName); |
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cleanupBody.end(); |
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op.extendMethodImplementation(IComponent.class, |
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EnhanceUtils.CLEANUP_AFTER_RENDER_SIGNATURE, cleanupBody.toString()); |
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} |
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private void buildMutator(EnhancementOperation op, String parameterName, |
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String propertyName, Class propertyType, String fieldName, |
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String defaultFieldName, String cachedFieldName, |
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String bindingFieldName, Location location) |
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{ |
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BodyBuilder builder = new BodyBuilder(); |
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builder.begin(); |
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builder.addln("if (! isInActiveState())"); |
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builder.begin(); |
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builder.addln("{0} = $1;", defaultFieldName); |
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builder.addln("return;"); |
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builder.end(); |
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builder.addln("if ({0} == null)", bindingFieldName); |
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builder.addln(" throw new {0}(\"Parameter ''{1}'' is not bound and can not be updated.\");", |
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ApplicationRuntimeException.class.getName(), parameterName); |
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builder.addln("{0}.setObject(($w) $1);", bindingFieldName); |
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builder.addln("if (isRendering())"); |
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builder.begin(); |
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builder.addln("{0} = $1;", fieldName); |
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builder.addln("{0} = true;", cachedFieldName); |
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builder.end(); |
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builder.end(); |
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String mutatorMethodName = EnhanceUtils.createMutatorMethodName(propertyName); |
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op.addMethod(Modifier.PUBLIC, |
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new MethodSignature(void.class, mutatorMethodName, new Class[] { propertyType }, null), |
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builder.toString(), location); |
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} |
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void buildAccessor(EnhancementOperation op, String propertyName, Class propertyType, |
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String fieldName, String defaultFieldName, String cachedFieldName, |
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String bindingFieldName, boolean cache, Location location) |
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{ |
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BodyBuilder builder = new BodyBuilder(); |
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builder.begin(); |
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builder.addln("if ({0}) return {1};", cachedFieldName, fieldName); |
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builder.addln("if ({0} == null) return {1};", bindingFieldName, defaultFieldName); |
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String javaTypeName = ClassFabUtils.getJavaClassName(propertyType); |
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builder.addln("{0} result = {1};", javaTypeName, EnhanceUtils.createUnwrapExpression(op, bindingFieldName, propertyType)); |
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String expression = cache ? "isRendering() || {0}.isInvariant()" : "{0}.isInvariant()"; |
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builder.addln("if (" + expression + ")", bindingFieldName); |
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builder.begin(); |
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builder.addln("{0} = result;", fieldName); |
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builder.addln("{0} = true;", cachedFieldName); |
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builder.end(); |
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builder.addln("return result;"); |
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builder.end(); |
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String accessorMethodName = op.getAccessorMethodName(propertyName); |
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op.addMethod(Modifier.PUBLIC, new MethodSignature(propertyType, |
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accessorMethodName, null, null), builder.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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} |