diff options
Diffstat (limited to 'bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/p2/metadata/expression/IExpression.java')
| -rw-r--r-- | bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/p2/metadata/expression/IExpression.java | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/p2/metadata/expression/IExpression.java b/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/p2/metadata/expression/IExpression.java new file mode 100644 index 000000000..889675381 --- /dev/null +++ b/bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/p2/metadata/expression/IExpression.java @@ -0,0 +1,67 @@ +/******************************************************************************* + * Copyright (c) 2009 - 2010 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.p2.metadata.expression; + +/** + * A node in the expression tree + */ +public interface IExpression { + int TYPE_ALL = 1; + int TYPE_AND = 2; + int TYPE_AT = 3; + int TYPE_EQUALS = 4; + int TYPE_EXISTS = 5; + int TYPE_GREATER = 6; + int TYPE_GREATER_EQUAL = 7; + int TYPE_LAMBDA = 8; + int TYPE_LESS = 9; + int TYPE_LESS_EQUAL = 10; + int TYPE_LITERAL = 11; + int TYPE_MATCHES = 12; + int TYPE_MEMBER = 13; + int TYPE_NOT = 14; + int TYPE_NOT_EQUALS = 15; + int TYPE_OR = 16; + int TYPE_PARAMETER = 17; + int TYPE_VARIABLE = 18; + + /** + * Let the visitor visit this instance and all expressions that this + * instance contains. + * @param visitor The visiting visitor. + * @return <code>true</code> if the visitor should continue visiting, <code>false</code> otherwise. + */ + boolean accept(IExpressionVisitor visitor); + + /** + * Evaluate this expression with given context and variables. + * @param context The evaluation context + * @return The result of the evaluation. + */ + Object evaluate(IEvaluationContext context); + + /** + * Returns the expression type (see TYPE_xxx constants). + */ + int getExpressionType(); + + /** + * Appends the string representation of this expression to the collector <code>collector</code>. + */ + void toString(StringBuffer collector); + + /** + * Appends the an LDAP filter representation of this expression to the <code>collector</code>. + * @throws UnsupportedOperationException if the expression contains nodes + * that cannot be represented in an LDAP filter + */ + void toLDAPString(StringBuffer collector); +} |