| /******************************************************************************* |
| * Copyright (c) 2006, 2007 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.ui.internal.expressions; |
| |
| import org.eclipse.core.expressions.EvaluationResult; |
| import org.eclipse.core.expressions.Expression; |
| import org.eclipse.core.expressions.ExpressionInfo; |
| import org.eclipse.core.expressions.IEvaluationContext; |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.ui.ISources; |
| import org.eclipse.ui.IWorkbenchWindow; |
| |
| /** |
| * <p> |
| * An expression that evaluates to {@link EvaluationResult#TRUE} when the active |
| * workbench window matches the window held by this expression. |
| * </p> |
| * |
| * @since 3.2 |
| */ |
| public class WorkbenchWindowExpression extends Expression { |
| |
| /** |
| * The seed for the hash code for all schemes. |
| */ |
| private static final int HASH_INITIAL = WorkbenchWindowExpression.class |
| .getName().hashCode(); |
| |
| /** |
| * The workbench window that must be active for this expression to evaluate |
| * to <code>true</code>. If this value is <code>null</code>, then any |
| * workbench window may be active. |
| */ |
| private final IWorkbenchWindow window; |
| |
| /** |
| * Constructs a new instance. |
| * |
| * @param window |
| * The workbench window which must be active for this expression |
| * to evaluate to <code>true</code>; may be <code>null</code> |
| * if this expression is always <code>true</code>. |
| */ |
| public WorkbenchWindowExpression(final IWorkbenchWindow window) { |
| this.window = window; |
| } |
| |
| public void collectExpressionInfo(final ExpressionInfo info) { |
| if (window != null) { |
| info.addVariableNameAccess(ISources.ACTIVE_WORKBENCH_WINDOW_NAME); |
| } |
| } |
| |
| protected int computeHashCode() { |
| return HASH_INITIAL * HASH_FACTOR + hashCode(window); |
| } |
| |
| public boolean equals(final Object object) { |
| if (object instanceof WorkbenchWindowExpression) { |
| final WorkbenchWindowExpression that = (WorkbenchWindowExpression) object; |
| return equals(this.window, that.window); |
| } |
| |
| return false; |
| } |
| |
| public EvaluationResult evaluate(final IEvaluationContext context) |
| throws CoreException { |
| if (window != null) { |
| Object value = context |
| .getVariable(ISources.ACTIVE_WORKBENCH_WINDOW_NAME); |
| if (window.equals(value)) { |
| return EvaluationResult.TRUE; |
| } |
| } |
| |
| return EvaluationResult.FALSE; |
| } |
| |
| /** |
| * Returns the workbench window to which this expression applies. |
| * |
| * @return The workbench window to which this expression applies; may be |
| * <code>null</code>. |
| */ |
| protected final IWorkbenchWindow getWindow() { |
| return window; |
| } |
| |
| public String toString() { |
| final StringBuffer buffer = new StringBuffer(); |
| buffer.append("WorkbenchWindowExpression("); //$NON-NLS-1$ |
| buffer.append(window); |
| buffer.append(')'); |
| return buffer.toString(); |
| } |
| } |
| |