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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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38 | 0 | 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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{ |
45 | 0 | Iterator i = spec.getParameterNames().iterator(); |
46 | 0 | while(i.hasNext()) |
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{ |
48 | 0 | String name = (String) i.next(); |
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50 | 0 | IParameterSpecification ps = spec.getParameter(name); |
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try |
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{ |
54 | 0 | performEnhancement(op, name, ps); |
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} |
56 | 0 | catch (RuntimeException ex) |
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{ |
58 | 0 | _errorLog.error(EnhanceMessages.errorAddingProperty(ps.getPropertyName(), op.getBaseClass(), ex), |
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ps.getLocation(), ex); |
60 | 0 | } |
61 | 0 | } |
62 | 0 | } |
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private void performEnhancement(EnhancementOperation op, String parameterName, IParameterSpecification ps) |
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{ |
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81 | 0 | if (!parameterName.equals(ps.getParameterName())) |
82 | 0 | return; |
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84 | 0 | String propertyName = ps.getPropertyName(); |
85 | 0 | String specifiedType = ps.getType(); |
86 | 0 | boolean cache = ps.getCache(); |
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88 | 0 | addParameter(op, parameterName, propertyName, specifiedType, cache, ps.getLocation()); |
89 | 0 | } |
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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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{ |
116 | 0 | Defense.notNull(op, "op"); |
117 | 0 | Defense.notNull(parameterName, "parameterName"); |
118 | 0 | Defense.notNull(propertyName, "propertyName"); |
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120 | 0 | Class propertyType = EnhanceUtils.extractPropertyType(op, propertyName, specifiedType); |
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127 | 0 | op.claimProperty(propertyName); |
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132 | 0 | String fieldName = "_$" + propertyName; |
133 | 0 | String defaultFieldName = fieldName + "$Default"; |
134 | 0 | String cachedFieldName = fieldName + "$Cached"; |
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136 | 0 | op.addField(fieldName, propertyType); |
137 | 0 | op.addField(defaultFieldName, propertyType); |
138 | 0 | op.addField(cachedFieldName, boolean.class); |
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140 | 0 | String bindingFieldName = buildBindingAccessor(op, fieldName, parameterName, location); |
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142 | 0 | buildAccessor(op, propertyName, propertyType, fieldName, |
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defaultFieldName, cachedFieldName, bindingFieldName, |
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cache, location); |
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146 | 0 | buildMutator(op, parameterName, propertyName, propertyType, fieldName, |
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defaultFieldName, cachedFieldName, bindingFieldName, location); |
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149 | 0 | extendCleanupAfterRender(op, bindingFieldName, fieldName, defaultFieldName, cachedFieldName); |
150 | 0 | } |
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String buildBindingAccessor(EnhancementOperation op, String fieldName, String parameterName, Location location) |
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{ |
154 | 0 | BodyBuilder body = new BodyBuilder(); |
155 | 0 | body.begin(); |
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157 | 0 | String bindingFieldName = fieldName + "$Binding"; |
158 | 0 | String bindingCheckedName = bindingFieldName + "Checked"; |
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160 | 0 | op.addField(bindingFieldName, IBinding.class); |
161 | 0 | op.addField(bindingCheckedName, Boolean.TYPE); |
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163 | 0 | body.addln("if (!{0})", bindingCheckedName); |
164 | 0 | body.begin(); |
165 | 0 | body.addln("{0} = getBinding(\"{1}\");", bindingFieldName, parameterName); |
166 | 0 | body.addln("{0} = true;", bindingCheckedName); |
167 | 0 | body.end(); |
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169 | 0 | body.addln("return {0};", bindingFieldName); |
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171 | 0 | body.end(); |
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173 | 0 | String methodName = EnhanceUtils.createAccessorMethodName(bindingFieldName); |
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175 | 0 | 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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179 | 0 | 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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{ |
185 | 0 | BodyBuilder cleanupBody = new BodyBuilder(); |
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193 | 0 | cleanupBody.addln("if ({0} && ! {1}.isInvariant())", cachedFieldName, bindingFieldName); |
194 | 0 | cleanupBody.begin(); |
195 | 0 | cleanupBody.addln("{0} = false;", cachedFieldName); |
196 | 0 | cleanupBody.addln("{0} = {1};", fieldName, defaultFieldName); |
197 | 0 | cleanupBody.end(); |
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199 | 0 | op.extendMethodImplementation(IComponent.class, |
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EnhanceUtils.CLEANUP_AFTER_RENDER_SIGNATURE, cleanupBody.toString()); |
201 | 0 | } |
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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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{ |
208 | 0 | BodyBuilder builder = new BodyBuilder(); |
209 | 0 | builder.begin(); |
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216 | 0 | builder.addln("if (! isInActiveState())"); |
217 | 0 | builder.begin(); |
218 | 0 | builder.addln("{0} = $1;", defaultFieldName); |
219 | 0 | builder.addln("return;"); |
220 | 0 | builder.end(); |
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225 | 0 | builder.addln("if ({0} == null)", bindingFieldName); |
226 | 0 | builder.addln(" throw new {0}(\"Parameter ''{1}'' is not bound and can not be updated.\");", |
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ApplicationRuntimeException.class.getName(), parameterName); |
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231 | 0 | builder.addln("{0}.setObject(($w) $1);", bindingFieldName); |
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237 | 0 | builder.addln("if (isRendering())"); |
238 | 0 | builder.begin(); |
239 | 0 | builder.addln("{0} = $1;", fieldName); |
240 | 0 | builder.addln("{0} = true;", cachedFieldName); |
241 | 0 | builder.end(); |
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243 | 0 | builder.end(); |
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245 | 0 | String mutatorMethodName = EnhanceUtils.createMutatorMethodName(propertyName); |
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247 | 0 | op.addMethod(Modifier.PUBLIC, |
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new MethodSignature(void.class, mutatorMethodName, new Class[] { propertyType }, null), |
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builder.toString(), location); |
250 | 0 | } |
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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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{ |
258 | 0 | BodyBuilder builder = new BodyBuilder(); |
259 | 0 | builder.begin(); |
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261 | 0 | builder.addln("if ({0}) return {1};", cachedFieldName, fieldName); |
262 | 0 | builder.addln("if ({0} == null) return {1};", bindingFieldName, defaultFieldName); |
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264 | 0 | String javaTypeName = ClassFabUtils.getJavaClassName(propertyType); |
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266 | 0 | builder.addln("{0} result = {1};", javaTypeName, EnhanceUtils.createUnwrapExpression(op, bindingFieldName, propertyType)); |
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273 | 0 | String expression = cache ? "isRendering() || {0}.isInvariant()" : "{0}.isInvariant()"; |
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275 | 0 | builder.addln("if (" + expression + ")", bindingFieldName); |
276 | 0 | builder.begin(); |
277 | 0 | builder.addln("{0} = result;", fieldName); |
278 | 0 | builder.addln("{0} = true;", cachedFieldName); |
279 | 0 | builder.end(); |
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281 | 0 | builder.addln("return result;"); |
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283 | 0 | builder.end(); |
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285 | 0 | String accessorMethodName = op.getAccessorMethodName(propertyName); |
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287 | 0 | op.addMethod(Modifier.PUBLIC, new MethodSignature(propertyType, |
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accessorMethodName, null, null), builder.toString(), location); |
289 | 0 | } |
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public void setErrorLog(ErrorLog errorLog) |
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{ |
293 | 0 | _errorLog = errorLog; |
294 | 0 | } |
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} |