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| package org.apache.tapestry.services.impl; |
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| |
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| import java.util.Iterator; |
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| import java.util.List; |
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| import java.util.Map; |
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| |
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| import ognl.ClassResolver; |
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| import ognl.Ognl; |
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| import ognl.OgnlRuntime; |
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| import ognl.TypeConverter; |
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| |
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| import org.apache.hivemind.ApplicationRuntimeException; |
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| import org.apache.tapestry.Tapestry; |
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| import org.apache.tapestry.services.ExpressionCache; |
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| import org.apache.tapestry.services.ExpressionEvaluator; |
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| import org.apache.tapestry.spec.IApplicationSpecification; |
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| public class ExpressionEvaluatorImpl implements ExpressionEvaluator |
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| { |
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| private ClassResolver _ognlResolver = new OgnlClassResolver(); |
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| |
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| private ExpressionCache _expressionCache; |
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| |
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| private IApplicationSpecification _applicationSpecification; |
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| |
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| private TypeConverter _typeConverter; |
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| |
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| private List _contributions; |
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| public void setApplicationSpecification(IApplicationSpecification applicationSpecification)
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| { |
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| _applicationSpecification = applicationSpecification;
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| } |
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| |
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| public void initializeService()
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| { |
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| if (_applicationSpecification.checkExtension(Tapestry.OGNL_TYPE_CONVERTER))
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| _typeConverter = (TypeConverter) _applicationSpecification.getExtension(
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| Tapestry.OGNL_TYPE_CONVERTER, |
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| TypeConverter.class); |
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| |
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| Iterator i = _contributions.iterator();
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| while (i.hasNext())
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| { |
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| PropertyAccessorContribution c = (PropertyAccessorContribution) i.next();
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| OgnlRuntime.setPropertyAccessor(c.getSubjectClass(), c.getAccessor());
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| } |
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| |
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| } |
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| |
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| public Object read(Object target, String expression)
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| { |
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| return readCompiled(target, _expressionCache.getCompiledExpression(expression));
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| } |
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| |
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| public Object readCompiled(Object target, Object expression)
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| { |
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| try
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| { |
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| Map context = createContext(target);
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| |
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| return Ognl.getValue(expression, context, target);
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| } |
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| catch (Exception ex) |
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| { |
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| throw new ApplicationRuntimeException(ImplMessages.unableToReadExpression(ImplMessages
|
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| .parsedExpression(), target, ex), target, null, ex); |
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| } |
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| } |
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| |
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| private Map createContext(Object target)
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| { |
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| Map result = Ognl.createDefaultContext(target, _ognlResolver);
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| if (_typeConverter != null)
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| Ognl.setTypeConverter(result, _typeConverter);
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| return result;
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| } |
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| public void write(Object target, String expression, Object value)
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| { |
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| writeCompiled(target, _expressionCache.getCompiledExpression(expression), value);
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| } |
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| |
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| public void writeCompiled(Object target, Object expression, Object value)
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| { |
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| try
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| { |
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| Map context = createContext(target);
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| |
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| Ognl.setValue(expression, context, target, value);
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| } |
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| catch (Exception ex) |
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| { |
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| throw new ApplicationRuntimeException(ImplMessages.unableToWriteExpression(ImplMessages
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| .parsedExpression(), target, value, ex), target, null, ex); |
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| } |
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| } |
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| public boolean isConstant(String expression)
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| { |
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| Object compiled = _expressionCache.getCompiledExpression(expression);
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| try
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| { |
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| return Ognl.isConstant(compiled);
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| } |
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| catch (Exception ex) |
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| { |
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| throw new ApplicationRuntimeException(ImplMessages.isConstantExpressionError(
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| expression, |
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| ex), ex); |
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| } |
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| } |
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| public void setExpressionCache(ExpressionCache expressionCache)
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| { |
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| _expressionCache = expressionCache;
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| } |
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| |
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| public void setContributions(List contributions)
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| { |
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| _contributions = contributions;
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| } |
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| } |