allocationvariable.java

著名IT公司ILog的APS高级排产优化引擎

package com.power.pipeengine.Variable;

import com.power.pipeengine.Entity.*;
import java.util.ResourceBundle;
import java.util.*;

public class AllocationVariable
    extends Variable {
  private static final AllocationVariable INSTANCE =
      new AllocationVariable();

  // Private constructor supresses
  // default public constructor
  private AllocationVariable() {
  }

  public static AllocationVariable getInstance() {
    return INSTANCE;
  }

  public String getVariable(Facility f, Product p, Route r, Bucket b) {
    String varName = getDefinedVar(f, p, r, b);
    if (null != varName) {
      return varName;
    }

    varName = new String("A" + "F" + f.getVariableCode() +
                         "P" + p.getVariableCode() +
                         "R" + r.getVariableCode() +
                         "T" + b.getVariableCode());

    addDefinedVar(f, p, r, b, varName);

    return varName;
  }

  public String getVariable(RouteSource rteSrc, Bucket b) {
    String separator = "";
    Route r = rteSrc.getRoute();

    String varName = getDefinedVar(r.getSrcingFacility(),
                                   rteSrc.getSrcingProduct(),
                                   r,
                                   b);
    if (null == varName) {
      varName = new String("A" +
                           "F" + r.getSrcingFacility().getVariableCode() +
                           "P" + rteSrc.getSrcingProduct().getVariableCode() +
                           "R" + r.getVariableCode() +
                           "T" + b.getVariableCode());

      addDefinedVar(r.getSrcingFacility(),
                    rteSrc.getSrcingProduct(),
                    r,
                    b,
                    varName);
    }

    if (rteSrc.isSingle()) {
      setObjElement(varName,
                    0.1 + 0.01 / (rteSrc.getRank() + 1) + Math.random() * 0.0000001);
    }

    return varName;
  }

  private Hashtable _definedVars = new Hashtable();
  private String getDefinedVar(Facility f, Product p, Route r, Bucket b) {
    Hashtable prodHash = (Hashtable) _definedVars.get(f.getVariableCode());
    if (prodHash == null)
      return null;

    Hashtable rteHash = (Hashtable) prodHash.get(p.getVariableCode());
    if (rteHash == null)
      return null;

    Hashtable bucketHash = (Hashtable) rteHash.get(r.getVariableCode());
    if (bucketHash == null)
      return null;

    return (String) bucketHash.get(b.getVariableCode());
  }

  private void addDefinedVar(Facility f, Product p, Route r, Bucket b,
                             String varName) {
    Hashtable prodHash = (Hashtable) _definedVars.get(f.getVariableCode());
    if (prodHash == null) {
      prodHash = new Hashtable();
      _definedVars.put(f.getVariableCode(), prodHash);
    }

    Hashtable rteHash = (Hashtable) prodHash.get(p.getVariableCode());
    if (rteHash == null) {
      rteHash = new Hashtable();
      prodHash.put(p.getVariableCode(), rteHash);
    }

    Hashtable bucketHash = (Hashtable) rteHash.get(r.getVariableCode());
    if (bucketHash == null) {
      bucketHash = new Hashtable();
      rteHash.put(r.getVariableCode(), bucketHash);
    }

    bucketHash.put(b.getVariableCode(), varName);
  }

  public void reset() {
    _definedVars = new Hashtable();
  }

}