Revision: 1686
http://svn.sourceforge.net/spring-rich-c/?rev=1686&view=rev
Author: jhoskens
Date: 2007-01-24 00:58:25 -0800 (Wed, 24 Jan 2007)
Log Message:
-----------
Added ConditionalPropertyConstraint which provides if...then...else pattern
applied to several properties (not a propertyValue)
Provided factory methods in Constraints
Modified Paths:
--------------
trunk/spring-richclient/support/src/main/java/org/springframework/rules/factory/Constraints.java
Added Paths:
-----------
trunk/spring-richclient/support/src/main/java/org/springframework/rules/constraint/property/ConditionalPropertyConstraint.java
Added:
trunk/spring-richclient/support/src/main/java/org/springframework/rules/constraint/property/ConditionalPropertyConstraint.java
===================================================================
---
trunk/spring-richclient/support/src/main/java/org/springframework/rules/constraint/property/ConditionalPropertyConstraint.java
(rev 0)
+++
trunk/spring-richclient/support/src/main/java/org/springframework/rules/constraint/property/ConditionalPropertyConstraint.java
2007-01-24 08:58:25 UTC (rev 1686)
@@ -0,0 +1,123 @@
+package org.springframework.rules.constraint.property;
+
+import org.springframework.binding.PropertyAccessStrategy;
+import org.springframework.rules.constraint.IfTrue;
+import org.springframework.util.Assert;
+
+/**
+ * <p>
+ * Provides a way to trigger rules for propertyB when propertyA satisfies a
+ * certain condition:
+ * </p>
+ *
+ * <pre>
+ * if (propertyA satisfies the conditional constraint)
+ * {
+ * check the rules for propertyB
+ * }
+ * </pre>
+ *
+ * with an optional part:
+ *
+ * <pre>
+ * else
+ * {
+ * check the rules for propertyC
+ * }
+ * </pre>
+ *
+ * <p>
+ * More complex situations are possible by using compound constraints which
+ * leverages the previous to:
+ * </p>
+ *
+ * <pre>
+ * if (constraint(propertyA, propertyB,...) == true)
+ * {
+ * checkConstraint(property1, property2,...);
+ * }
+ * \\ optional part
+ * else
+ * {
+ * checkConstraint(propertyX, propertyY,...);
+ * }
+ * </pre>
+ *
+ * <p>
+ * This class can be compared to the [EMAIL PROTECTED] IfTrue} class: it
applies the same
+ * pattern but on different <b>properties</b> instead of on a <b>property
value</b>.
+ * </p>
+ *
+ * @author jh
+ *
+ */
+public class ConditionalPropertyConstraint extends AbstractPropertyConstraint {
+
+ /** The condition which triggers further rules to be checked. */
+ private final PropertyConstraint ifConstraint;
+
+ /** The constraint to be checked when the condition is satisfied. */
+ private final PropertyConstraint thenConstraint;
+
+ /** The constraint to be checked when the condition is <b>NOT</b>
satisfied. */
+ private final PropertyConstraint elseConstraint;
+
+ /**
+ * Create a constraint which simulates the if...then pattern applied
+ * on separate properties.
+ *
+ * @param ifConstraint the PropertyConstraint that triggers the test
+ * (satisfying a certain condition).
+ * @param thenConstraint the PropertyConstraint to test in the specified
+ * condition.
+ */
+ public ConditionalPropertyConstraint(PropertyConstraint ifConstraint,
PropertyConstraint thenConstraint) {
+ this(ifConstraint, thenConstraint, null);
+ }
+
+ /**
+ * Create a constraint which simulates the if...then...else pattern
applied
+ * on separate properties.
+ *
+ * @param ifConstraint the PropertyConstraint that triggers the test
+ * (satisfying a certain condition).
+ * @param thenConstraint the PropertyConstraint to test in the specified
+ * condition.
+ * @param elseConstraint the PropertyConstraint to test if the
condition is
+ * <b>NOT</b> satisfied. May be <code>null</code>.
+ */
+ public ConditionalPropertyConstraint(PropertyConstraint ifConstraint,
PropertyConstraint thenConstraint,
+ PropertyConstraint elseConstraint) {
+ super(ifConstraint.getPropertyName());
+ Assert.notNull(ifConstraint);
+ Assert.notNull(thenConstraint);
+ this.ifConstraint = ifConstraint;
+ this.thenConstraint = thenConstraint;
+ this.elseConstraint = elseConstraint;
+ }
+
+ @Override
+ public boolean isCompoundRule() {
+ return true;
+ }
+
+ @Override
+ public boolean isDependentOn(String propertyName) {
+ if (elseConstraint == null)
+ return ifConstraint.isDependentOn(propertyName) ||
thenConstraint.isDependentOn(propertyName);
+
+ return ifConstraint.isDependentOn(propertyName) ||
thenConstraint.isDependentOn(propertyName)
+ || elseConstraint.isDependentOn(propertyName);
+ }
+
+ @Override
+ protected boolean test(PropertyAccessStrategy
domainObjectAccessStrategy) {
+ if (ifConstraint.test(domainObjectAccessStrategy))
+ return thenConstraint.test(domainObjectAccessStrategy);
+ if (elseConstraint != null)
+ return elseConstraint.test(domainObjectAccessStrategy);
+
+ return true;
+ }
+
+}
Modified:
trunk/spring-richclient/support/src/main/java/org/springframework/rules/factory/Constraints.java
===================================================================
---
trunk/spring-richclient/support/src/main/java/org/springframework/rules/factory/Constraints.java
2007-01-22 14:53:27 UTC (rev 1685)
+++
trunk/spring-richclient/support/src/main/java/org/springframework/rules/factory/Constraints.java
2007-01-24 08:58:25 UTC (rev 1686)
@@ -44,6 +44,7 @@
import org.springframework.rules.constraint.XOr;
import org.springframework.rules.constraint.Like.LikeType;
import
org.springframework.rules.constraint.property.CompoundPropertyConstraint;
+import
org.springframework.rules.constraint.property.ConditionalPropertyConstraint;
import org.springframework.rules.constraint.property.NegatedPropertyConstraint;
import
org.springframework.rules.constraint.property.ParameterizedPropertyConstraint;
import org.springframework.rules.constraint.property.PropertiesConstraint;
@@ -319,13 +320,57 @@
public Constraint ifTrue(Constraint constraint, Constraint mustAlsoBeTrue,
Constraint elseMustAlsoBeTrue) {
return new IfTrue(constraint, mustAlsoBeTrue, elseMustAlsoBeTrue);
}
+
+ /**
+ * Returns a ConditionalPropertyConstraint: one property will trigger
the
+ * validation of another.
+ *
+ * @see ConditionalPropertyConstraint
+ */
+ public PropertyConstraint ifTrue(PropertyConstraint ifConstraint,
PropertyConstraint thenConstraint) {
+ return new ConditionalPropertyConstraint(ifConstraint,
thenConstraint);
+ }
+
+ /**
+ * Returns a ConditionalPropertyConstraint: one property will trigger
the
+ * validation of another.
+ *
+ * @see ConditionalPropertyConstraint
+ */
+ public PropertyConstraint ifTrue(PropertyConstraint ifConstraint,
PropertyConstraint thenConstraint,
+ PropertyConstraint elseConstraint) {
+ return new ConditionalPropertyConstraint(ifConstraint,
thenConstraint, elseConstraint);
+ }
+
+ /**
+ * Returns a ConditionalPropertyConstraint: one property will trigger
the
+ * validation of another.
+ *
+ * @see ConditionalPropertyConstraint
+ */
+ public PropertyConstraint ifTrue(PropertyConstraint ifConstraint,
PropertyConstraint[] thenConstraints) {
+ return new ConditionalPropertyConstraint(ifConstraint, new
CompoundPropertyConstraint(new And(thenConstraints)));
+ }
+
+ /**
+ * Returns a ConditionalPropertyConstraint: one property will trigger
the
+ * validation of another.
+ *
+ * @see ConditionalPropertyConstraint
+ */
+ public PropertyConstraint ifTrue(PropertyConstraint ifConstraint,
PropertyConstraint[] thenConstraints,
+ PropertyConstraint[] elseConstraints) {
+ return new ConditionalPropertyConstraint(ifConstraint,
+ new CompoundPropertyConstraint(new
And(thenConstraints)), new CompoundPropertyConstraint(new And(
+ elseConstraints)));
+ }
/**
- * Returns a maxlength constraint.
- *
- * @param maxLength The maximum length in characters.
- * @return The configured maxlength constraint.
- */
+ * Returns a maxlength constraint.
+ *
+ * @param maxLength The maximum length in characters.
+ * @return The configured maxlength constraint.
+ */
public Constraint maxLength(int maxLength) {
return new StringLengthConstraint(maxLength);
}
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