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Constraints-linkmode patch from Daniel Ruthardt

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<http://grazia.helma.at/pipermail/helma-dev/2003-August/000272.html>
Changes to patch:
* Changed type.properties option name from "linkmode" to "logic"
* Added support for XOR
* Some internal code reorganization
This commit is contained in:
hns 2003-09-15 16:26:42 +00:00
parent a73d52d184
commit 4466c58864
1 changed files with 42 additions and 0 deletions
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42
src/helma/objectmodel/db/Relation.java
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@ -47,6 +47,13 @@ public final class Relation {
// this is managed differently than REFERENCE, hence the separate type.
public final static int COMPLEX_REFERENCE = 3;
// constraints linked together by OR or AND if applicable?
private int constraintsLogic;
public final static int CONSTRAINTS_AND = 0;
public final static int CONSTRAINTS_OR = 1;
public final static int CONSTRAINTS_XOR = 2;
public final String[] logicalOperators = {" AND ", " OR ", " XOR "};
// direct mapping is a very powerful feature: objects of some types can be directly accessed
// by one of their properties/db fields.
// public final static int DIRECT = 3;
@ -93,6 +100,7 @@ public final class Relation {
this.constraints = rel.constraints;
this.accessName = rel.accessName;
this.maxSize = rel.maxSize;
this.constraintsLogic = rel.constraintsLogic;
}
/**
@ -304,10 +312,33 @@ public final class Relation {
cnst.addElement(new Constraint(local, foreign, false));
}
}
// parse constraints logic
if (cnst.size() > 1) {
String logic = props.getProperty(propName + ".logic");
if ("and".equalsIgnoreCase(logic))
constraintsLogic = CONSTRAINTS_AND;
else if ("or".equalsIgnoreCase(logic))
constraintsLogic = CONSTRAINTS_OR;
else if ("xor".equalsIgnoreCase(logic))
constraintsLogic = CONSTRAINTS_XOR;
else
throw new RuntimeException("Unrecognized logical operator: "+logic);
} else
constraintsLogic = CONSTRAINTS_AND;
}
///////////////////////////////////////////////////////////////////////////////////////////
/**
* Constraints linked by AND or OR?
*/
public String getConstraintsOperator() {
return logicalOperators[constraintsLogic];
}
/**
* Does this relation describe a virtual (collection) node?
*/
@ -647,9 +678,20 @@ public final class Relation {
prefix = " AND ";
}
if (constraints.length > 1 && constraintsLogic != CONSTRAINTS_AND) {
q.append(prefix);
q.append("(");
prefix = "";
}
for (int i = 0; i < constraints.length; i++) {
q.append(prefix);
constraints[i].addToQuery(q, home, nonvirtual);
prefix = getConstraintsOperator();
}
if (constraints.length > 1 && constraintsLogic != CONSTRAINTS_AND) {
q.append(")");
prefix = " AND ";
}