Ognl对象图导航语言源码

// --------------------------------------------------------------------------
// Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
// All rights reserved.
//
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package ognl;
import ognl.enhance.ExpressionAccessor;
import java.io.StringReader;
import java.util.Map;
/**
*

* This class provides static methods for parsing and interpreting OGNL expressions.
*

*

* The simplest use of the Ognl class is to get the value of an expression from an object, without
* extra context or pre-parsing.
*

*
*

 *
 * import ognl.Ognl; import ognl.OgnlException; try { result = Ognl.getValue(expression, root); }
 * catch (OgnlException ex) { // Report error or recover }
 *
 * 

*
*

* This will parse the expression given and evaluate it against the root object given, returning the
* result. If there is an error in the expression, such as the property is not found, the exception
* is encapsulated into an {@link ognl.OgnlException OgnlException}.
*

*

* Other more sophisticated uses of Ognl can pre-parse expressions. This provides two advantages: in
* the case of user-supplied expressions it allows you to catch parse errors before evaluation and
* it allows you to cache parsed expressions into an AST for better speed during repeated use. The
* pre-parsed expression is always returned as an Object to simplify use for programs
* that just wish to store the value for repeated use and do not care that it is an AST. If it does
* care it can always safely cast the value to an AST type.
*

*

* The Ognl class also takes a context map as one of the parameters to the set and get
* methods. This allows you to put your own variables into the available namespace for OGNL
* expressions. The default context contains only the #root and #context
* keys, which are required to be present. The addDefaultContext(Object, Map) method
* will alter an existing Map to put the defaults in. Here is an example that shows
* how to extract the documentName property out of the root object and append a
* string with the current user name in parens:
*

*
*

 *
 * private Map cOntext= new HashMap(); public void setUserName(String value) {
 * context.put("userName", value); } try { // get value using our own custom context map result =
 * Ognl.getValue("documentName + \" (\" + ((#userName == null) ? \"\" : #userName) +
 * \")\"", context, root); } catch (OgnlException ex) { // Report error or recover }
 *
 * 

*
* @author Luke Blanshard (blanshlu@netscape.net)
* @author Drew Davidson (drew@ognl.org)
* @version 27 June 1999
*/
public abstract class Ognl
{
/**
* Parses the given OGNL expression and returns a tree representation of the expression that can
* be used by Ognl static methods.
*
* @param expression
* the OGNL expression to be parsed
* @return a tree representation of the expression
* @throws ExpressionSyntaxException
* if the expression is malformed
* @throws OgnlException
* if there is a pathological environmental problem
*/
public static Object parseExpression(String expression)
throws OgnlException
{
try {
OgnlParser parser = new OgnlParser(new StringReader(expression));
return parser.topLevelExpression();
} catch (ParseException e) {
throw new ExpressionSyntaxException(expression, e);
} catch (TokenMgrError e) {
throw new ExpressionSyntaxException(expression, e);
}
}
/**
* Parses and compiles the given expression using the {@link ognl.enhance.OgnlExpressionCompiler} returned
* from {@link ognl.OgnlRuntime#getCompiler()}.
*
* @param context
* The context to use.
* @param root
* The root object for the given expression.
* @param expression
* The expression to compile.
*
* @return The node with a compiled accessor set on {@link ognl.Node#getAccessor()} if compilation
* was successfull. In instances where compilation wasn‘t possible because of a partially null
* expression the {@link ExpressionAccessor} instance may be null and the compilation of this expression
* still possible at some as yet indertermined point in the future.
*
* @throws Exception If a compilation error occurs.
*/
public static Node compileExpression(OgnlContext context, Object root, String expression)
throws Exception
{
Node expr = (Node)Ognl.parseExpression(expression);
OgnlRuntime.compileExpression(context, expr, root);
return expr;
}
/**
* Creates and returns a new standard naming context for evaluating an OGNL expression.
*
* @param root
* the root of the object graph
* @return a new Map with the keys root and context set
* appropriately
*/
public static Map createDefaultContext(Object root)
{
return addDefaultContext(root, null, null, null, new OgnlContext());
}
/**
* Creates and returns a new standard naming context for evaluating an OGNL expression.
*
* @param root
* The root of the object graph.
* @param classResolver
* The resolver used to instantiate {@link Class} instances referenced in the expression.
*
* @return a new OgnlContext with the keys root and context set
* appropriately
*/
public static Map createDefaultContext(Object root, ClassResolver classResolver)
{
return addDefaultContext(root, classResolver, null, null, new OgnlContext());
}
/**
* Creates and returns a new standard naming context for evaluating an OGNL expression.
*
* @param root
* The root of the object graph.
* @param classResolver
* The resolver used to instantiate {@link Class} instances referenced in the expression.
* @param converter
* Converter used to convert return types of an expression in to their desired types.
*
* @return a new Map with the keys root and context set
* appropriately
*/
public static Map createDefaultContext(Object root, ClassResolver classResolver, TypeConverter converter)
{
return addDefaultContext(root, classResolver, converter, null, new OgnlContext());
}
/**
* Creates and returns a new standard naming context for evaluating an OGNL expression.
*
* @param root
* The root of the object graph.
* @param classResolver
* The resolver used to instantiate {@link Class} instances referenced in the expression.
* @param converter
* Converter used to convert return types of an expression in to their desired types.
* @param memberAccess
* Java security handling object to determine semantics for accessing normally private/protected
* methods / fields.
* @return a new Map with the keys root and context set
* appropriately
*/
public static Map createDefaultContext(Object root, ClassResolver classResolver,
TypeConverter converter, MemberAccess memberAccess)
{
return addDefaultContext(root, classResolver, converter, memberAccess, new OgnlContext());
}
/**
* Appends the standard naming context for evaluating an OGNL expression into the context given
* so that cached maps can be used as a context.
*
* @param root
* the root of the object graph
* @param context
* the context to which OGNL context will be added.
* @return Context Map with the keys root and context set
* appropriately
*/
public static Map addDefaultContext(Object root, Map context)
{
return addDefaultContext(root, null, null, null, context);
}
/**
* Appends the standard naming context for evaluating an OGNL expression into the context given
* so that cached maps can be used as a context.
*
* @param root
* The root of the object graph.
* @param classResolver
* The resolver used to instantiate {@link Class} instances referenced in the expression.
* @param context
* The context to which OGNL context will be added.
*
* @return Context Map with the keys root and context set
* appropriately
*/
public static Map addDefaultContext(Object root, ClassResolver classResolver, Map context)
{
return addDefaultContext(root, classResolver, null, null, context);
}
/**
* Appends the standard naming context for evaluating an OGNL expression into the context given
* so that cached maps can be used as a context.
*
* @param root
* The root of the object graph.
* @param classResolver
* The resolver used to instantiate {@link Class} instances referenced in the expression.
* @param converter
* Converter used to convert return types of an expression in to their desired types.
* @param context
* The context to which OGNL context will be added.
*
* @return Context Map with the keys root and context set
* appropriately
*/
public static Map addDefaultContext(Object root, ClassResolver classResolver,
TypeConverter converter, Map context)
{
return addDefaultContext(root, classResolver, converter, null, context);
}
/**
* Appends the standard naming context for evaluating an OGNL expression into the context given
* so that cached maps can be used as a context.
*
* @param root
* the root of the object graph
* @param classResolver
* The class loading resolver that should be used to resolve class references.
* @param converter
* The type converter to be used by default.
* @param memberAccess
* Definition for handling private/protected access.
* @param context
* Default context to use, if not an {@link OgnlContext} will be dumped into
* a new {@link OgnlContext} object.
* @return Context Map with the keys root and context set
* appropriately
*/
public static Map addDefaultContext(Object root, ClassResolver classResolver,
TypeConverter converter, MemberAccess memberAccess, Map context)
{
OgnlContext result;
if (!(context instanceof OgnlContext)) {
result = new OgnlContext();
result.setValues(context);
} else {
result = (OgnlContext) context;
}
if (classResolver != null) {
result.setClassResolver(classResolver);
}
if (converter != null) {
result.setTypeConverter(converter);
}
if (memberAccess != null) {
result.setMemberAccess(memberAccess);
}
result.setRoot(root);
return result;
}
/**
* Configures the {@link ClassResolver} to use for the given context. Will be used during
* expression parsing / execution to resolve class names.
*
* @param context
* The context to place the resolver.
* @param classResolver
* The resolver to use to resolve classes.
*/
public static void setClassResolver(Map context, ClassResolver classResolver)
{
context.put(OgnlContext.CLASS_RESOLVER_CONTEXT_KEY, classResolver);
}
/**
* Gets the previously stored {@link ClassResolver} for the given context - if any.
*
* @param context
* The context to get the configured resolver from.
*
* @return The resolver instance, or null if none found.
*/
public static ClassResolver getClassResolver(Map context)
{
return (ClassResolver) context.get(OgnlContext.CLASS_RESOLVER_CONTEXT_KEY);
}
/**
* Configures the type converter to use for a given context. This will be used
* to convert into / out of various java class types.
*
* @param context
* The context to configure it for.
* @param converter
* The converter to use.
*/
public static void setTypeConverter(Map context, TypeConverter converter)
{
context.put(OgnlContext.TYPE_CONVERTER_CONTEXT_KEY, converter);
}
/**
* Gets the currently configured {@link TypeConverter} for the given context - if any.
*
* @param context
* The context to get the converter from.
*
* @return The converter - or null if none found.
*/
public static TypeConverter getTypeConverter(Map context)
{
return (TypeConverter) context.get(OgnlContext.TYPE_CONVERTER_CONTEXT_KEY);
}
/**
* Configures the specified context with a {@link MemberAccess} instance for
* handling field/method protection levels.
*
* @param context
* The context to configure.
* @param memberAccess
* The access resolver to configure the context with.
*/
public static void setMemberAccess(Map context, MemberAccess memberAccess)
{
context.put(OgnlContext.MEMBER_ACCESS_CONTEXT_KEY, memberAccess);
}
/**
* Gets the currently stored {@link MemberAccess} object for the given context - if any.
*
* @param context
* The context to get the object from.
*
* @return The configured {@link MemberAccess} instance in the specified context - or null if none found.
*/
public static MemberAccess getMemberAccess(Map context)
{
return (MemberAccess) context.get(OgnlContext.MEMBER_ACCESS_CONTEXT_KEY);
}
/**
* Sets the root object to use for all expressions in the given context - doesn‘t necessarily replace
* root object instances explicitly passed in to other expression resolving methods on this class.
*
* @param context
* The context to store the root object in.
* @param root
* The root object.
*/
public static void setRoot(Map context, Object root)
{
context.put(OgnlContext.ROOT_CONTEXT_KEY, root);
}
/**
* Gets the stored root object for the given context - if any.
*
* @param context
* The context to get the root object from.
*
* @return The root object - or null if none found.
*/
public static Object getRoot(Map context)
{
return context.get(OgnlContext.ROOT_CONTEXT_KEY);
}
/**
* Gets the last {@link Evaluation} executed on the given context.
*
* @param context
* The context to get the evaluation from.
*
* @return The {@link Evaluation} - or null if none was found.
*/
public static Evaluation getLastEvaluation(Map context)
{
return (Evaluation) context.get(OgnlContext.LAST_EVALUATION_CONTEXT_KEY);
}
/**
* Evaluates the given OGNL expression tree to extract a value from the given root object. The
* default context is set for the given context and root via addDefaultContext().
*
* @param tree
* the OGNL expression tree to evaluate, as returned by parseExpression()
* @param context
* the naming context for the evaluation
* @param root
* the root object for the OGNL expression
* @return the result of evaluating the expression
* @throws MethodFailedException
* if the expression called a method which failed
* @throws NoSuchPropertyException
* if the expression referred to a nonexistent property
* @throws InappropriateExpressionException
* if the expression can‘t be used in this context
* @throws OgnlException
* if there is a pathological environmental problem
*/
public static Object getValue(Object tree, Map context, Object root)
throws OgnlException
{
return getValue(tree, context, root, null);
}
/**
* Evaluates the given OGNL expression tree to extract a value from the given root object. The
* default context is set for the given context and root via addDefaultContext().
*
* @param tree
* the OGNL expression tree to evaluate, as returned by parseExpression()
* @param context
* the naming context for the evaluation
* @param root
* the root object for the OGNL expression
* @param resultType
* the converted type of the resultant object, using the context‘s type converter
* @return the result of evaluating the expression
* @throws MethodFailedException
* if the expression called a method which failed
* @throws NoSuchPropertyException
* if the expression referred to a nonexistent property
* @throws InappropriateExpressionException
* if the expression can‘t be used in this context
* @throws OgnlException
* if there is a pathological environmental problem
*/
public static Object getValue(Object tree, Map context, Object root, Class resultType)
throws OgnlException
{
Object result;
OgnlContext ognlContext = (OgnlContext) addDefaultContext(root, context);
Node node = (Node)tree;
if (node.getAccessor() != null)
result = node.getAccessor().get(ognlContext, root);
else
result = node.getValue(ognlContext, root);
if (resultType != null) {
result = getTypeConverter(context).convertValue(context, root, null, null, result, resultType);
}
return result;
}
/**
* Gets the value represented by the given pre-compiled expression on the specified root
* object.
*
* @param expression
* The pre-compiled expression, as found in {@link Node#getAccessor()}.
* @param context
* The ognl context.
* @param root
* The object to retrieve the expression value from.
* @return
* The value.
*/
public static Object getValue(ExpressionAccessor expression, OgnlContext context, Object root)
{
return expression.get(context, root);
}
/**
* Gets the value represented by the given pre-compiled expression on the specified root
* object.
*
* @param expression
* The pre-compiled expression, as found in {@link Node#getAccessor()}.
* @param context
* The ognl context.
* @param root
* The object to retrieve the expression value from.
* @param resultType
* The desired object type that the return value should be converted to using the {@link #getTypeConverter(java.util.Map)} }.
* @return
* The value.
*/
public static Object getValue(ExpressionAccessor expression, OgnlContext context,
Object root, Class resultType)
{
return getTypeConverter(context).convertValue(context, root, null, null, expression.get(context, root), resultType);
}
/**
* Evaluates the given OGNL expression to extract a value from the given root object in a given
* context
*
* @see #parseExpression(String)
* @see #getValue(Object,Object)
* @param expression
* the OGNL expression to be parsed
* @param context
* the naming context for the evaluation
* @param root
* the root object for the OGNL expression
* @return the result of evaluating the expression
* @throws MethodFailedException
* if the expression called a method which failed
* @throws NoSuchPropertyException
* if the expression referred to a nonexistent property
* @throws InappropriateExpressionException
* if the expression can‘t be used in this context
* @throws OgnlException
* if there is a pathological environmental problem
*/
public static Object getValue(String expression, Map context, Object root)
throws OgnlException
{
return getValue(expression, context, root, null);
}
/**
* Evaluates the given OGNL expression to extract a value from the given root object in a given
* context
*
* @see #parseExpression(String)
* @see #getValue(Object,Object)
* @param expression
* the OGNL expression to be parsed
* @param context
* the naming context for the evaluation
* @param root
* the root object for the OGNL expression
* @param resultType
* the converted type of the resultant object, using the context‘s type converter
* @return the result of evaluating the expression
* @throws MethodFailedException
* if the expression called a method which failed
* @throws NoSuchPropertyException
* if the expression referred to a nonexistent property
* @throws InappropriateExpressionException
* if the expression can‘t be used in this context
* @throws OgnlException
* if there is a pathological environmental problem
*/
public static Object getValue(String expression, Map context, Object root, Class resultType)
throws OgnlException
{
return getValue(parseExpression(expression), context, root, resultType);
}
/**
* Evaluates the given OGNL expression tree to extract a value from the given root object.
*
* @param tree
* the OGNL expression tree to evaluate, as returned by parseExpression()
* @param root
* the root object for the OGNL expression
* @return the result of evaluating the expression
* @throws MethodFailedException
* if the expression called a method which failed
* @throws NoSuchPropertyException
* if the expression referred to a nonexistent property
* @throws InappropriateExpressionException
* if the expression can‘t be used in this context
* @throws OgnlException
* if there is a pathological environmental problem
*/
public static Object getValue(Object tree, Object root)
throws OgnlException
{
return getValue(tree, root, null);
}
/**
* Evaluates the given OGNL expression tree to extract a value from the given root object.
*
* @param tree
* the OGNL expression tree to evaluate, as returned by parseExpression()
* @param root
* the root object for the OGNL expression
* @param resultType
* the converted type of the resultant object, using the context‘s type converter
* @return the result of evaluating the expression
* @throws MethodFailedException
* if the expression called a method which failed
* @throws NoSuchPropertyException
* if the expression referred to a nonexistent property
* @throws InappropriateExpressionException
* if the expression can‘t be used in this context
* @throws OgnlException
* if there is a pathological environmental problem
*/
public static Object getValue(Object tree, Object root, Class resultType)
throws OgnlException
{
return getValue(tree, createDefaultContext(root), root, resultType);
}
/**
* Convenience method that combines calls to parseExpression and
* getValue.
*
* @see #parseExpression(String)
* @see #getValue(Object,Object)
* @param expression
* the OGNL expression to be parsed
* @param root
* the root object for the OGNL expression
* @return the result of evaluating the expression
* @throws ExpressionSyntaxException
* if the expression is malformed
* @throws MethodFailedException
* if the expression called a method which failed
* @throws NoSuchPropertyException
* if the expression referred to a nonexistent property
* @throws InappropriateExpressionException
* if the expression can‘t be used in this context
* @throws OgnlException
* if there is a pathological environmental problem
*/
public static Object getValue(String expression, Object root)
throws OgnlException
{
return getValue(expression, root, null);
}
/**
* Convenience method that combines calls to parseExpression and
* getValue.
*
* @see #parseExpression(String)
* @see #getValue(Object,Object)
* @param expression
* the OGNL expression to be parsed
* @param root
* the root object for the OGNL expression
* @param resultType
* the converted type of the resultant object, using the context‘s type converter
* @return the result of evaluating the expression
* @throws ExpressionSyntaxException
* if the expression is malformed
* @throws MethodFailedException
* if the expression called a method which failed
* @throws NoSuchPropertyException
* if the expression referred to a nonexistent property
* @throws InappropriateExpressionException
* if the expression can‘t be used in this context
* @throws OgnlException
* if there is a pathological environmental problem
*/
public static Object getValue(String expression, Object root, Class resultType)
throws OgnlException
{
return getValue(parseExpression(expression), root, resultType);
}
/**
* Evaluates the given OGNL expression tree to insert a value into the object graph rooted at
* the given root object. The default context is set for the given context and root via addDefaultContext().
*
* @param tree
* the OGNL expression tree to evaluate, as returned by parseExpression()
* @param context
* the naming context for the evaluation
* @param root
* the root object for the OGNL expression
* @param value
* the value to insert into the object graph
* @throws MethodFailedException
* if the expression called a method which failed
* @throws NoSuchPropertyException
* if the expression referred to a nonexistent property
* @throws InappropriateExpressionException
* if the expression can‘t be used in this context
* @throws OgnlException
* if there is a pathological environmental problem
*/
public static void setValue(Object tree, Map context, Object root, Object value)
throws OgnlException
{
OgnlContext ognlContext = (OgnlContext) addDefaultContext(root, context);
Node n = (Node) tree;
if (n.getAccessor() != null) {
n.getAccessor().set(ognlContext, root, value);
return;
}
n.setValue(ognlContext, root, value);
}
/**
* Sets the value given using the pre-compiled expression on the specified root
* object.
*
* @param expression
* The pre-compiled expression, as found in {@link Node#getAccessor()}.
* @param context
* The ognl context.
* @param root
* The object to set the expression value on.
* @param value
* The value to set.
*/
public static void setValue(ExpressionAccessor expression, OgnlContext context,
Object root, Object value)
{
expression.set(context, root, value);
}
/**
* Evaluates the given OGNL expression to insert a value into the object graph rooted at the
* given root object given the context.
*
* @param expression
* the OGNL expression to be parsed
* @param root
* the root object for the OGNL expression
* @param context
* the naming context for the evaluation
* @param value
* the value to insert into the object graph
* @throws MethodFailedException
* if the expression called a method which failed
* @throws NoSuchPropertyException
* if the expression referred to a nonexistent property
* @throws InappropriateExpressionException
* if the expression can‘t be used in this context
* @throws OgnlException
* if there is a pathological environmental problem
*/
public static void setValue(String expression, Map context, Object root, Object value)
throws OgnlException
{
setValue(parseExpression(expression), context, root, value);
}
/**
* Evaluates the given OGNL expression tree to insert a value into the object graph rooted at
* the given root object.
*
* @param tree
* the OGNL expression tree to evaluate, as returned by parseExpression()
* @param root
* the root object for the OGNL expression
* @param value
* the value to insert into the object graph
* @throws MethodFailedException
* if the expression called a method which failed
* @throws NoSuchPropertyException
* if the expression referred to a nonexistent property
* @throws InappropriateExpressionException
* if the expression can‘t be used in this context
* @throws OgnlException
* if there is a pathological environmental problem
*/
public static void setValue(Object tree, Object root, Object value)
throws OgnlException
{
setValue(tree, createDefaultContext(root), root, value);
}
/**
* Convenience method that combines calls to parseExpression and
* setValue.
*
* @see #parseExpression(String)
* @see #setValue(Object,Object,Object)
* @param expression
* the OGNL expression to be parsed
* @param root
* the root object for the OGNL expression
* @param value
* the value to insert into the object graph
* @throws ExpressionSyntaxException
* if the expression is malformed
* @throws MethodFailedException
* if the expression called a method which failed
* @throws NoSuchPropertyException
* if the expression referred to a nonexistent property
* @throws InappropriateExpressionException
* if the expression can‘t be used in this context
* @throws OgnlException
* if there is a pathological environmental problem
*/
public static void setValue(String expression, Object root, Object value)
throws OgnlException
{
setValue(parseExpression(expression), root, value);
}
/**
* Checks if the specified {@link Node} instance represents a constant
* expression.
*
* @param tree
* The {@link Node} to check.
* @param context
* The context to use.
*
* @return True if the node is a constant - false otherwise.
* @throws OgnlException If an error occurs checking the expression.
*/
public static boolean isConstant(Object tree, Map context)
throws OgnlException
{
return ((SimpleNode) tree).isConstant((OgnlContext) addDefaultContext(null, context));
}
/**
* Checks if the specified expression represents a constant expression.
*
* @param expression
* The expression to check.
* @param context
* The context to use.
*
* @return True if the node is a constant - false otherwise.
* @throws OgnlException If an error occurs checking the expression.
*/
public static boolean isConstant(String expression, Map context)
throws OgnlException
{
return isConstant(parseExpression(expression), context);
}
/**
* Same as {@link #isConstant(Object, java.util.Map)} - only the {@link Map} context
* is created for you.
*
* @param tree
* The {@link Node} to check.
*
* @return True if the node represents a constant expression - false otherwise.
* @throws OgnlException If an exception occurs.
*/
public static boolean isConstant(Object tree)
throws OgnlException
{
return isConstant(tree, createDefaultContext(null));
}
/**
* Same as {@link #isConstant(String, java.util.Map)} - only the {@link Map}
* instance is created for you.
*
* @param expression
* The expression to check.
*
* @return True if the expression represents a constant - false otherwise.
* @throws OgnlException If an exception occurs.
*/
public static boolean isConstant(String expression)
throws OgnlException
{
return isConstant(parseExpression(expression), createDefaultContext(null));
}
public static boolean isSimpleProperty(Object tree, Map context)
throws OgnlException
{
return ((SimpleNode) tree).isSimpleProperty((OgnlContext) addDefaultContext(null, context));
}
public static boolean isSimpleProperty(String expression, Map context)
throws OgnlException
{
return isSimpleProperty(parseExpression(expression), context);
}
public static boolean isSimpleProperty(Object tree)
throws OgnlException
{
return isSimpleProperty(tree, createDefaultContext(null));
}
public static boolean isSimpleProperty(String expression)
throws OgnlException
{
return isSimpleProperty(parseExpression(expression), createDefaultContext(null));
}
public static boolean isSimpleNavigationChain(Object tree, Map context)
throws OgnlException
{
return ((SimpleNode) tree).isSimpleNavigationChain((OgnlContext) addDefaultContext(null, context));
}
public static boolean isSimpleNavigationChain(String expression, Map context)
throws OgnlException
{
return isSimpleNavigationChain(parseExpression(expression), context);
}
public static boolean isSimpleNavigationChain(Object tree)
throws OgnlException
{
return isSimpleNavigationChain(tree, createDefaultContext(null));
}
public static boolean isSimpleNavigationChain(String expression)
throws OgnlException
{
return isSimpleNavigationChain(parseExpression(expression), createDefaultContext(null));
}
/** You can‘t make one of these. */
private Ognl()
{
}
}