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com.zfabrik.util.expression
Class X

java.lang.Object
  com.zfabrik.util.expression.X

Direct Known Subclasses:: X.BinaryOp, X.UnaryOp, X.Val, X.Var

public abstract class X extends java.lang.Object
extends java.lang.Object

Simple boolean expression language as a Java expressed DSL. X is used in component repositories to formulate component queries but may be used anywhere where simple boolean expressions are useful.

A built-in evaluation of an expression over a map defining a context is supported.

For example, given a map m={"a":5, "b":"hello"},

 var("a").ge(val(6)).and(var("b").eq(val("hello"))).eval(m)

would evaluate to false while

 var("a").le(val(6)).and(var("b").eq(val("hello"))).eval(m)

would evaluate to true.

Author:: hb

Nested Class Summary
`static class`	`X.And` "AND" logical operator
`static class`	`X.BinaryOp` Abstract binary operators
`static class`	`X.Eq` "equality" comparison operator.
`static class`	`X.Ge` "greater or equal" comparison operator.
`static class`	`X.Gt` "greater than" comparison operator.
`static class`	`X.In` "containment" operator.
`static class`	`X.Le` "less or equal" comparison operator.
`static class`	`X.Lt` "less than" comparison operator.
`static class`	`X.Neq` "not equals" comparison operator.
`static class`	`X.Not` Negation logical operator
`static class`	`X.Or` "OR" logical operator
`static class`	`X.UnaryOp` Abstract single-operand operator
`static class`	`X.Val` Explicit value.
`static class`	`X.Var` Variable of field value operator.
`static class`	`X.Xor` "XOR" logical operator

Constructor Summary
`X()`

Method Summary
`X`	`and(X x)` Convenience method for chain-style notation of expressions.
`static X`	`and(X x, X y)` Static factory method, for convenience
`X`	`eq(X x)` Convenience method for chain-style notation of expressions.
`static X`	`eq(X x, X y)` Static factory method, for convenience
`java.lang.Object`	`eval()` Convenience version of `eval(Map)` that is equivalent to calling `eval(Map)` with an empty map or a null argument.
`abstract java.lang.Object`	`eval(java.util.Map<java.lang.String,java.lang.Object> context)` Evaluation of the expression over a map style context that defines variable values.
`java.lang.Object`	`eval(java.util.Properties context)` Convenience version of `eval(Map)` accepting a `Properties` argument
`X`	`ge(X x)` Convenience method for chain-style notation of expressions.
`X`	`gt(X x)` Convenience method for chain-style notation of expressions.
`X`	`in(X x)` Convenience method for chain-style notation of expressions.
`X`	`le(X x)` Convenience method for chain-style notation of expressions.
`X`	`lt(X x)` Convenience method for chain-style notation of expressions.
`X`	`neq(X x)` Convenience method for chain-style notation of expressions.
`static X`	`neq(X x, X y)` Static factory method, for convenience
`X`	`not()` Convenience method for chain-style notation of expressions.
`static X`	`not(X x)` Static factory method, for convenience
`X`	`or(X x)` Convenience method for chain-style notation of expressions.
`static X`	`or(X x, X y)` Static factory method, for convenience
`static X`	`val(java.lang.Object val)` Static factory method, for convenience
`static X`	`var(java.lang.String name)` Static factory method, for convenience
`X`	`xor(X x)` Convenience method for chain-style notation of expressions.
`static X`	`xor(X x, X y)` Static factory method, for convenience

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

X

public X()

Method Detail