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package com.sun.el;
import java.util.Map;
import java.util.HashMap;
import java.util.Properties;
import java.lang.reflect.Method;
import javax.el.ELContext;
import javax.el.ELException;
import javax.el.ExpressionFactory;
import javax.el.MethodExpression;
import javax.el.ValueExpression;
import javax.el.ELResolver;
import com.sun.el.lang.ExpressionBuilder;
import com.sun.el.lang.ELSupport;
import com.sun.el.util.MessageFactory;
import com.sun.el.stream.StreamELResolver;
/**
* @see javax.el.ExpressionFactory
*
* @author Jacob Hookom [jacob@hookom.net]
* @author Kin-man Chung
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $
*/
public class ExpressionFactoryImpl extends ExpressionFactory {
/**
*
*/
public ExpressionFactoryImpl() {
super();
}
public ExpressionFactoryImpl(Properties properties) {
super();
this.properties = properties;
this.isBackwardCompatible22 = "true".equals(getProperty("javax.el.bc2.2"));
}
public Object coerceToType(Object obj, Class type) {
Object ret;
try {
ret = ELSupport.coerceToType(obj, type, isBackwardCompatible22);
} catch (IllegalArgumentException ex) {
throw new ELException(ex);
}
return ret;
}
public MethodExpression createMethodExpression(ELContext context,
String expression, Class expectedReturnType,
Class[] expectedParamTypes) {
ExpressionBuilder builder = new ExpressionBuilder(expression, context);
MethodExpression me = builder.createMethodExpression(expectedReturnType,
expectedParamTypes);
if (expectedParamTypes == null && !me.isParametersProvided()) {
throw new NullPointerException(MessageFactory
.get("error.method.nullParms"));
}
return me;
}
public ValueExpression createValueExpression(ELContext context,
String expression, Class expectedType) {
if (expectedType == null) {
throw new NullPointerException(MessageFactory
.get("error.value.expectedType"));
}
ExpressionBuilder builder = new ExpressionBuilder(expression, context);
return builder.createValueExpression(expectedType);
}
public ValueExpression createValueExpression(Object instance,
Class expectedType) {
if (expectedType == null) {
throw new NullPointerException(MessageFactory
.get("error.value.expectedType"));
}
return new ValueExpressionLiteral(instance, expectedType);
}
public String getProperty(String key) {
if (properties == null) return null;
return properties.getProperty(key);
}
@Override
public ELResolver getStreamELResolver() {
return new StreamELResolver();
}
@Override
public Map<String, Method> getInitFunctionMap() {
Map<String, Method> funcs = new HashMap<String, Method>();
return funcs;
}
private Properties properties;
private boolean isBackwardCompatible22;
}