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JClarion runtime environment
/**
* Copyright 2010, by Andrew Barnham
*
* The contents of this file are subject to
* GNU Lesser General Public License (LGPL), v.3
* http://www.gnu.org/licenses/lgpl.txt
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied.
*/
package org.jclarion.clarion;
import java.util.ArrayList;
import java.util.List;
import org.jclarion.clarion.constants.*;
/**
* Model a sort key in Clarion
*
* @author barney
*
*/
public class ClarionKey extends PropertyObject
{
public static class Order
{
public ClarionObject object;
public boolean descend;
public String function;
public int order;
public Order(ClarionObject object,boolean descend,String function)
{
this.object=object;
this.descend=descend;
this.function=function;
}
public boolean equals(Object o)
{
if (o==this) return true;
if (!(o instanceof Order)) return false;
Order o_o = (Order)o;
if (o_o.object!=this.object) return false;
if (o_o.descend!=this.descend) return false;
if (o_o.order!=this.order) return false;
if (o_o.function==null) {
if (this.function!=null) return false;
} else {
if (this.function==null) return false;
if (!this.function.equals(o_o.function)) return false;
}
return true;
}
}
private String label;
private List fields = new ArrayList();
public ClarionKey(String label)
{
this.label=label;
}
/**
* Key is a primary key
*
* @return
*/
public ClarionKey setPrimary() {
setProperty(Prop.PRIMARY,true);
return this;
}
/**
* Key allows duplicate records
*
* @return
*/
public ClarionKey setDuplicate() {
setProperty(Prop.DUP,true);
return this;
}
/**
* Key is case insensitive
*
* @return
*/
public ClarionKey setNocase() {
setProperty(Prop.NOCASE,true);
return this;
}
/**
* Key is optional, i.e. zero/null values are not keyed
*
* @return
*/
public ClarionKey setOptional() {
setProperty(Prop.OPT,true);
return this;
}
/**
* Specify key name
*
* @param name
* @return
*/
public ClarionKey setName(String name) {
setProperty(Prop.NAME,true);
return this;
}
/**
* Add field that is ascending
*
* @param object
* @return
*/
public ClarionKey addAscendingField(ClarionObject object) {
fields.add(new Order(object,false,null));
order=null;
getOrder();
return this;
}
public ClarionKey addField(ClarionObject object,boolean descend,String function) {
fields.add(new Order(object,descend,function));
order=null;
getOrder();
return this;
}
public ClarionKey addDescendingField(ClarionObject object) {
fields.add(new Order(object,true,null));
order=null;
getOrder();
return this;
}
/**
* Set record processing order based on specified key. Start position
* is based on current settings in key
*/
public void set()
{
reset(getPosition());
}
public void set(ClarionKey key)
{
reset(getPosition());
}
/**
* Get string position store for the given key
*
* @return
*/
public ClarionString getPosition()
{
return clarionFile.getPosition(this);
}
/**
* Return whether or not adding current record would trigger a duplicate key
* error
*
* @return true if adding current record would trigger duplicate key
*/
public boolean duplicateCheck()
{
return clarionFile.duplicateCheck(this);
}
/**
* Re-fetch record from the database based on position string
*
* @param string
*/
public void reget(ClarionString string)
{
clarionFile.reget(this,string);
}
/**
* Re-set sequentual processing from the database based on position string
*
* @param string
*/
public void reset(ClarionString string)
{
clarionFile.reset(this,string);
}
/**
* Set sequentual processing. Setting start position to start of file
*/
public void setStart()
{
clarionFile.set(this);
}
private ClarionFile clarionFile;
public void setFile(ClarionFile clarionFile) {
this.clarionFile=clarionFile;
}
public ClarionFile getFile()
{
return clarionFile;
}
public List getFields()
{
return fields;
}
private Order[] order;
public Order[] getOrder()
{
if (order==null) {
if (clarionFile==null) return null;
order=new Order[fields.size()];
int scan=0;
for ( Order field : fields ) {
int w = clarionFile.where(field.object);
if (w==0) {
throw new RuntimeException("Field WHERE result invalid:"+field.object.getName());
}
order[scan++]=field;
field.order=clarionFile.where(field.object)*(field.descend?-1:1);
}
}
return order;
}
@Override
public PropertyObject getParentPropertyObject() {
// TODO Auto-generated method stub
return null;
}
public ClarionObject getProperty(ClarionObject key,ClarionObject index) {
switch (key.intValue()) {
case Prop.FIELD:
{
int indx = index.intValue();
if (indx<1 || indx>getOrder().length) return Clarion.newNumber(0).getString();
return Clarion.newNumber(Math.abs(getOrder()[indx-1].order));
}
case Prop.ASCENDING:
{
int indx = index.intValue();
if (indx<1 || indx>getOrder().length) return Clarion.newBool(0).getString();
return Clarion.newBool(getOrder()[indx-1].order>0?1:0);
}
}
return super.getProperty(key,index);
}
@Override
public ClarionObject getLocalProperty(int index) {
if (index==Prop.COMPONENTS) {
return Clarion.newNumber(fields.size());
}
if (index==Prop.LABEL) {
return new ClarionString(label);
}
// TODO Auto-generated method stub
return super.getLocalProperty(index);
}
public String toString()
{
StringBuilder r = new StringBuilder();
r.append("ClarionKey(");
r.append(label);
r.append(")");
for (Order field : fields) {
r.append(",");
r.append(field.descend ? "-" : "+");
if (field.function!=null) {
r.append(field.function);
r.append("(");
}
String name=null;
if (clarionFile!=null) {
ClarionString s_name = this.clarionFile.who(field.order);
if (s_name!=null) name=s_name.toString();
}
if (name==null) name=field.object.getName();
r.append(name);
if (field.function!=null) r.append(")");
}
r.append("[").append(System.identityHashCode(this)).append("]");
return r.toString();
}
public boolean equals(Object o)
{
if (o==this) return true;
if (!(o instanceof ClarionKey)) return false;
ClarionKey ck_o = (ClarionKey)o;
if (ck_o.clarionFile!=this.clarionFile) return false;
Order o_order[] = ck_o.getOrder();
Order order[] = this.getOrder();
if (order.length!=o_order.length) return false;
for (int scan=0;scan © 2015 - 2025 Weber Informatics LLC | Privacy Policy