122 lines
3.1 KiB
Java
122 lines
3.1 KiB
Java
package Ext_Tools;
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/**
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*
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* <b> Task of this class </b> <br/>
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* It represents a SelectClause in the parser.
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*/
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public class SelectClause {
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private boolean NoQualifierNeeded; //in case Select Element is *
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private SelectList SList;
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private String STResult;
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private String DiClause;
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/**
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*
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* <b> Task of this constructor </b> <br/>
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* in this case the SelectClause contains a SelectList
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* @param sl
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*/
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public SelectClause(SelectList sl) {
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this.NoQualifierNeeded = false;
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this.STResult="";
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this.SList = sl;
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}
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/**
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*
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* <b> Task of this constructor </b> <br/>
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* In this case the SelectClause contains a *
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* @param NonList
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*/
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public SelectClause(String NonList) {
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this.NoQualifierNeeded = true;
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this.SList = null;
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this.STResult = NonList;
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}
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/**
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*
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* <b> Task of this method </b> <br/>
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* The DistinctClause (DISTINT, ALL or nothing) is set
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* @param DiCl
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*/
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public void setDistinctClause(String DiCl) {
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this.DiClause = DiCl;
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}
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/**
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*
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* <b> Task of this method </b> <br/>
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* The content of the SelectClause is returned in a string
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* @return
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*/
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public String getSelectClause() {
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String result;
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if (this.NoQualifierNeeded)
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result = this.DiClause + this.STResult;
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else
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result = this.DiClause + this.SList.getSelectList();
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return result;
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}
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/**
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*
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* <b> Task of this method </b> <br/>
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* A qualifier can be added here. It will be done if the need for a qualifier
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* is recognized in a WhereElement
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* @param quali
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* @param att
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* @return true if a Qualifier could be set
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*/
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public boolean addQuali(String quali, String att) {
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boolean result = false;
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if (!this.NoQualifierNeeded)
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result = this.SList.addQuali(quali, att);
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return result;
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}
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/**
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*
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* <b> Task of this method </b> <br/>
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* All Select-Elements needs to be set with the Alias as Qualifier. The QualifierList does not need
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* to be set, because it does not need to be resolved. The ShadowQualifier List however needs to be
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* set. This method is needed in case the only table-element uses a qualifier which is not enforced or
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* just enforced by one of the Select-Elements but there are more Select-Elements of this Table-Element.
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* @param quali
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* @param ql
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*/
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public void setQuali(String Alias, QualifierList ql) {
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if (!this.NoQualifierNeeded)
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this.SList.setQualifier(Alias, ql);
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}
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public boolean qualifierNeeded(QualifierList ql) {
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boolean result = false;
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if (!this.NoQualifierNeeded)
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result = this.SList.qualifierNeeded(ql);
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return result;
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}
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/**
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*
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* <b> Task of this method </b> <br/>
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* in case Select Element has more than one element and a Set_Function_Specification
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* or group_by is used but no alias is set or an alias is used without a group_by.
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* @return
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*/
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public boolean groupbyNeeded(boolean groupbySet) {
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boolean result = false;
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if (!this.NoQualifierNeeded) // in case SelectElement = *
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result = this.SList.groupbyNeeded(groupbySet);
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return result;
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}
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}
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