?? nestedexpression.java
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/* * Copyright (c) 2002-2003 by OpenSymphony * All rights reserved. */package com.opensymphony.workflow.query;/** * Nested expressions are used when constructing a workflow query. * A nested expression consists of: * <li>one or more expressions: Each of them can again be a NestedExpression. * <li>operator: The operator used to evaluate the value of the nested expression * from the specified sub expressions. * * @author Christine Zimmermann */public class NestedExpression extends Expression { //~ Static fields/initializers ///////////////////////////////////////////// /** * Constant to specify that all the expressions specified must evaluate to true for * an item to be included in the search results. */ public final static int AND = 6; /** * Constant to specify that at least one of the expressions specified must evaluate to true * for an item to be included in the search results. */ public final static int OR = 7; //~ Instance fields //////////////////////////////////////////////////////// private Expression[] expressions = null; private int expressionOperator = AND; //~ Constructors /////////////////////////////////////////////////////////// public NestedExpression() { } /** * Create a NestedExpression that consists of multiple expressions. * @param expressions an array of expressions for this query. * @param operator {@link NestedExpression#AND} or {@link NestedExpression#OR}. */ public NestedExpression(Expression[] expressions, int operator) { this.expressions = expressions; this.expressionOperator = operator; } //~ Methods //////////////////////////////////////////////////////////////// public Expression getExpression(int index) { return expressions[index]; } /** * Get the number of expressions in this query. */ public int getExpressionCount() { return expressions.length; } public void setExpressionOperator(int expressionOperator) { this.expressionOperator = expressionOperator; } /** * @return {@link NestedExpression#AND} if all the expressions must match, * or {@link NestedExpression#OR} if only one must match. */ public int getExpressionOperator() { return this.expressionOperator; } public void setExpressions(Expression[] expressions) { this.expressions = expressions; } public boolean isNested() { return true; }}
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