File	Doc	Category	Size	Date	Package
MethodExpressionImpl.java	API Doc	Apache Tomcat 6.0.14	12327	Fri Jul 20 04:20:36 BST 2007	org.apache.el

MethodExpressionImpl

• java.lang.Object
  • javax.el.Expression
    • javax.el.MethodExpression

Fields Summary
private Class	expectedType
private String	expr
private FunctionMapper	fnMapper
private VariableMapper	varMapper
private transient org.apache.el.parser.Node	node
private Class[]	paramTypes

Constructors Summary
public MethodExpressionImpl() super();
public MethodExpressionImpl(String expr, org.apache.el.parser.Node node, FunctionMapper fnMapper, VariableMapper varMapper, Class expectedType, Class[] paramTypes) param expr param node param fnMapper param expectedType param paramTypes super(); this.expr = expr; this.node = node; this.fnMapper = fnMapper; this.varMapper = varMapper; this.expectedType = expectedType; this.paramTypes = paramTypes;

Methods Summary
public boolean	equals(java.lang.Object obj) Determines whether the specified object is equal to this Expression. The result is true if and only if the argument is not null, is an Expression object that is the of the same type (ValueExpression or MethodExpression), and has an identical parsed representation. Note that two expressions can be equal if their expression Strings are different. For example, ${fn1:foo()} and ${fn2:foo()} are equal if their corresponding FunctionMappers mapped fn1:foo and fn2:foo to the same method. param obj the Object to test for equality. return true if obj equals this Expression; false otherwise. see java.util.Hashtable see java.lang.Object#equals(java.lang.Object) return (obj instanceof MethodExpressionImpl && obj.hashCode() == this .hashCode());
public java.lang.String	getExpressionString() Returns the original String used to create this Expression, unmodified. This is used for debugging purposes but also for the purposes of comparison (e.g. to ensure the expression in a configuration file has not changed). This method does not provide sufficient information to re-create an expression. Two different expressions can have exactly the same expression string but different function mappings. Serialization should be used to save and restore the state of an Expression. return The original expression String. see javax.el.Expression#getExpressionString() return this.expr;
public javax.el.MethodInfo	getMethodInfo(javax.el.ELContext context) Evaluates the expression relative to the provided context, and returns information about the actual referenced method. param context The context of this evaluation return an instance of MethodInfo containing information about the method the expression evaluated to. throws NullPointerException if context is null or the base object is null on the last resolution. throws PropertyNotFoundException if one of the property resolutions failed because a specified variable or property does not exist or is not readable. throws MethodNotFoundException if no suitable method can be found. throws ELException if an exception was thrown while performing property or variable resolution. The thrown exception must be included as the cause property of this exception, if available. see javax.el.MethodExpression#getMethodInfo(javax.el.ELContext) Node n = this.getNode(); EvaluationContext ctx = new EvaluationContext(context, this.fnMapper, this.varMapper); return n.getMethodInfo(ctx, this.paramTypes);
private org.apache.el.parser.Node	getNode() return throws ELException if (this.node == null) { this.node = ExpressionBuilder.createNode(this.expr); } return this.node;
public int	hashCode() Returns the hash code for this Expression. See the note in the {@link #equals} method on how two expressions can be equal if their expression Strings are different. Recall that if two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result. Implementations must take special note and implement hashCode correctly. return The hash code for this Expression. see #equals see java.util.Hashtable see java.lang.Object#hashCode() return this.expr.hashCode();
public java.lang.Object	invoke(javax.el.ELContext context, java.lang.Object[] params) Evaluates the expression relative to the provided context, invokes the method that was found using the supplied parameters, and returns the result of the method invocation. param context The context of this evaluation. param params The parameters to pass to the method, or null if no parameters. return the result of the method invocation (null if the method has a void return type). throws NullPointerException if context is null or the base object is null on the last resolution. throws PropertyNotFoundException if one of the property resolutions failed because a specified variable or property does not exist or is not readable. throws MethodNotFoundException if no suitable method can be found. throws ELException if an exception was thrown while performing property or variable resolution. The thrown exception must be included as the cause property of this exception, if available. If the exception thrown is an InvocationTargetException, extract its cause and pass it to the ELException constructor. see javax.el.MethodExpression#invoke(javax.el.ELContext, java.lang.Object[]) EvaluationContext ctx = new EvaluationContext(context, this.fnMapper, this.varMapper); return this.getNode().invoke(ctx, this.paramTypes, params);
public boolean	isLiteralText() return false;
public void	readExternal(java.io.ObjectInput in) this.expr = in.readUTF(); String type = in.readUTF(); if (!"".equals(type)) { this.expectedType = ReflectionUtil.forName(type); } this.paramTypes = ReflectionUtil.toTypeArray(((String[]) in .readObject())); this.fnMapper = (FunctionMapper) in.readObject(); this.varMapper = (VariableMapper) in.readObject();
public void	writeExternal(java.io.ObjectOutput out) out.writeUTF(this.expr); out.writeUTF((this.expectedType != null) ? this.expectedType.getName() : ""); out.writeObject(ReflectionUtil.toTypeNameArray(this.paramTypes)); out.writeObject(this.fnMapper); out.writeObject(this.varMapper);