/* * Copyright (c) 2002-2003 by OpenSymphony * All rights reserved. */package com.opensymphony.workflow.query;/** * Field expressions are used when constructing a workflow query on the fields * of persistent workflow instances like (START_DATE, OWNER,....). * Field expressions have three attributes. These are: * <li>operator: This is the operator to apply on the expression. * <li>field: The workflow field to test agains * <li>Context: The context to search in, which can be one history, current steps, or a workflow instance. * * @author Christine Zimmermann */public class FieldExpression extends Expression {    //~ Static fields/initializers /////////////////////////////////////////////    // field operators    /**     * Constant for the equality operator.     */    public final static int EQUALS = 1;    /**     * Constant for the less than operator.     */    public final static int LT = 2;    /**     * Constant for the greater than operator.     */    public final static int GT = 3;    /**     * Constant for the not equals operator.     */    public final static int NOT_EQUALS = 5;    // fields    /**     * Constant for the workflow owner field.     */    public final static int OWNER = 1;    /**     * Constant for the workflow start date field.     */    public final static int START_DATE = 2;    /**     * Constant for the workflow finish date field.     */    public final static int FINISH_DATE = 3;    /**     * Constant for the workflow action field.     */    public final static int ACTION = 4;    /**     * Constant for the workflow step field.     */    public final static int STEP = 5;    /**     * Constant for the workflow caller field.     */    public final static int CALLER = 6;    /**     * Constant for the workflow status field.     */    public final static int STATUS = 7;    /**     * Constant for the workflow name field.     */    public final static int NAME = 8;    /**    * Constant for the state field.    */    public final static int STATE = 9;    /**    * Constant for the workflow due date field.    */    public final static int DUE_DATE = 10;    // field context    /**     * Constant for the history steps context.     * Specifying this context means that the search     * should be performed against the workflow steps.     */    public final static int HISTORY_STEPS = 1;    /**     * Constant for the history steps context.     * Specifying this context means that the search     * should be performed against the workflow current steps.     */    public final static int CURRENT_STEPS = 2;    /**     * Constant for the workflow entry context.     * Specifying this context means that the search     * should be performed against the workflow entries.     */    public final static int ENTRY = 3;    //~ Instance fields ////////////////////////////////////////////////////////    private Object value;    private int context;    private int field;    private int operator;    //~ Constructors ///////////////////////////////////////////////////////////    public FieldExpression() {    }    public FieldExpression(int field, int context, int operator, Object value) {        this.context = context;        this.operator = operator;        this.field = field;        this.value = value;    }    public FieldExpression(int field, int context, int operator, Object value, boolean negate) {        this(field, context, operator, value);        super.negate = negate;    }    //~ Methods ////////////////////////////////////////////////////////////////    public void setContext(int context) {        this.context = context;    }    public int getContext() {        return context;    }    public void setField(int field) {        this.field = field;    }    public int getField() {        return field;    }    public boolean isNested() {        return false;    }    public void setOperator(int operator) {        this.operator = operator;    }    public int getOperator() {        return operator;    }    public void setValue(Object value) {        this.value = value;    }    public Object getValue() {        return value;    }}