formula.java

OLAP 的客户端代码

/*
 * ====================================================================
 * This software is subject to the terms of the Common Public License
 * Agreement, available at the following URL:
 *   http://www.opensource.org/licenses/cpl.html .
 * Copyright (C) 2003-2004 TONBELLER AG.
 * All Rights Reserved.
 * You must accept the terms of that agreement to use this software.
 * ====================================================================
 *
 * 
 */
package com.tonbeller.jpivot.olap.mdxparse;

import com.tonbeller.jpivot.util.StringUtil;

/**
 * Formula representing a WITH MEMBER ...
 *                   or a WITH SET ...
 *
 */
public class Formula implements Exp {

  boolean isMember;
  String[] names;
  Exp exp;
  MemberProperty[] memberProperties;

  /** Construct formula specifying a set. */
  Formula(String[] names, Exp exp) {
    this(false, names, exp, new MemberProperty[0]);
  }

  /** Construct a formula specifying a member. */
  Formula(String[] names, Exp exp, MemberProperty[] memberProperties) {
    this(true, names, exp, memberProperties);
  }

  private Formula(boolean isMember, String[] names, Exp exp, MemberProperty[] memberProperties) {
    this.isMember = isMember;
    this.names = names;
    this.exp = exp;
    this.memberProperties = memberProperties;
  }

  /**
    * Returns the isMember.
    * @return boolean
    */
  public boolean isMember() {
    return isMember;
  }

  /**
   * return the unique name
   * @return String
   */
  public String getUniqeName() {
    String str = "";
    for (int i = 0; i < names.length; i++) {
      if (i > 0)
        str += ".";
      str += StringUtil.bracketsAround(names[i]);
    }

    return str;
  }

  /**
   * return the first name (Dimension/Hierarchy)
   * @return String
   */
  public String getFirstName() {
    return names[0];
  }

  /**
    * return the Last name (eg. member name)
    * @return String
    */
  public String getLastName() {
    int n = names.length - 1;
    return names[n];
  }

  /**
   * format to MDX
   */
  public String toMdx() {
    StringBuffer sb = new StringBuffer();
    if (isMember) {
      sb.append("MEMBER ");
    } else {
      sb.append("SET ");

    }

    for (int i = 0; i < names.length; i++) {
      if (i > 0)
        sb.append('.');
      sb.append(StringUtil.bracketsAround(names[i]));
    }

    sb.append(" AS '");
    sb.append(exp.toMdx());
    sb.append('\'');

    for (int i = 0; i < memberProperties.length; i++) {
      sb.append(',');
      sb.append(memberProperties[i].toMdx());
    }

    return sb.toString();
  }

  /**
   * 
   * @see java.lang.Object#clone()
   */
  public Object clone() {
    MemberProperty[] cloneMemberProperties = new MemberProperty[memberProperties.length];
    for (int i = 0; i < cloneMemberProperties.length; i++) {
      cloneMemberProperties[i] = (MemberProperty) memberProperties[i].clone();
    }
    return new Formula(isMember, names, (Exp) exp.clone(), cloneMemberProperties);

  }

  /**
   * @see com.tonbeller.jpivot.olap.mdxparse.Exp#accept
   */
  public void accept(ExpVisitor visitor) {
    visitor.visitFormula(this);
  }

  /**
   * @return Exp for formula
   */
  public Exp getExp() {
    return exp;
  }

} // End  Formula