Examples of oracle.toplink.essentials.expressions.Expression

Package oracle.toplink.essentials.expressions

Examples of oracle.toplink.essentials.expressions.Expression

oracle.toplink.essentials.expressions.Expression
Purpose: Define an object-level representation of a database query where clause.

Description: An expression is a tree-like structure that defines the selection criteria for a query against objects in the database. The expression has the advantage over SQL by being at the object-level, i.e. the object model attributes and relationships can be used to be query on instead of the database field names. Because it is an object, not a string the expression has the advantage that is can be easily manipulated through code to easily build complex selection criterias.

Responsibilities:
- Store the selection criteria in a tree-like structure.
- Support public manipulation protocols for all comparison and function opperators.
- Use opperator overloading to support all primitive types as well as objects.

            Iterator it = m_updateClauses.values().iterator();
            while(it.hasNext() ) {
                Object value = it.next();
                if(value != null) {
                    if(value instanceof Expression) {
                        Expression valueExpression = (Expression)value;
                        this.defaultBuilder = valueExpression.getBuilder();
                        if(this.defaultBuilder != null) {
                            return;
                        }
                    }
                }
            }
            it = m_updateClauses.keySet().iterator();
            while(it.hasNext() ) {
                Object field = it.next();
                if(field instanceof Expression) {
                    Expression fieldExpression = (Expression)field;
                    this.defaultBuilder = fieldExpression.getBuilder();
                    if(this.defaultBuilder != null) {
                        return;
                    }
                }
            }

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