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Diffstat (limited to 'bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/internal/p2/metadata/expression/Exists.java')
-rw-r--r--bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/internal/p2/metadata/expression/Exists.java42
1 files changed, 42 insertions, 0 deletions
diff --git a/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/internal/p2/metadata/expression/Exists.java b/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/internal/p2/metadata/expression/Exists.java
new file mode 100644
index 000000000..14fbc5df4
--- /dev/null
+++ b/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/internal/p2/metadata/expression/Exists.java
@@ -0,0 +1,42 @@
+/*******************************************************************************
+ * Copyright (c) 2009 Cloudsmith Inc. and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Cloudsmith Inc. - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.equinox.internal.p2.metadata.expression;
+
+import java.util.Iterator;
+import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext;
+
+/**
+ * A collection filter that yields true if the <code>filter</code> yields true for
+ * any of the elements of the <code>collection</code>
+ */
+final class Exists extends CollectionFilter {
+ Exists(Expression collection, LambdaExpression lambda) {
+ super(collection, lambda);
+ }
+
+ protected Object evaluate(IEvaluationContext context, Iterator<?> itor) {
+ Variable variable = lambda.getItemVariable();
+ while (itor.hasNext()) {
+ variable.setValue(context, itor.next());
+ if (lambda.evaluate(context) == Boolean.TRUE)
+ return Boolean.TRUE;
+ }
+ return Boolean.FALSE;
+ }
+
+ public int getExpressionType() {
+ return TYPE_EXISTS;
+ }
+
+ public String getOperator() {
+ return KEYWORD_EXISTS;
+ }
+}

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