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/*******************************************************************************
* Copyright (c) 2006, 2015 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* 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.ui.ISources;
import org.eclipse.ui.internal.services.SourcePriorityNameMapping;
/**
* <p>
* An expression representing the <code>part id</code> of the legacy editor
* action bar contribution.
* </p>
* <p>
* This class is not intended for use outside of the
* <code>org.eclipse.ui.workbench</code> plug-in.
* </p>
*
* @since 3.2
*/
public class LegacyEditorActionBarExpression extends Expression {
/**
* The seed for the hash code for all schemes.
*/
private static final int HASH_INITIAL = LegacyEditorActionBarExpression.class.getName().hashCode();
/**
* The identifier for the editor that must be active for this expression to
* evaluate to <code>true</code>. This value is never <code>null</code>.
*/
private final String activeEditorId;
/**
* Constructs a new instance of <code>LegacyEditorActionBarExpression</code>
*
* @param editorId The identifier of the editor to match with the active editor;
* must not be <code>null</code>
*/
public LegacyEditorActionBarExpression(final String editorId) {
if (editorId == null) {
throw new IllegalArgumentException("The targetId for an editor contribution must not be null"); //$NON-NLS-1$
}
activeEditorId = editorId;
}
@Override
public final void collectExpressionInfo(final ExpressionInfo info) {
info.addVariableNameAccess(ISources.ACTIVE_PART_ID_NAME);
info.addVariableNameAccess(SourcePriorityNameMapping.LEGACY_LEGACY_NAME);
}
@Override
protected final int computeHashCode() {
int hashCode = HASH_INITIAL * HASH_FACTOR + hashCode(activeEditorId);
return hashCode;
}
@Override
public final boolean equals(final Object object) {
if (object instanceof LegacyEditorActionBarExpression) {
final LegacyEditorActionBarExpression that = (LegacyEditorActionBarExpression) object;
return activeEditorId.equals(that.activeEditorId);
}
return false;
}
@Override
public final EvaluationResult evaluate(final IEvaluationContext context) {
final Object variable = context.getVariable(ISources.ACTIVE_PART_ID_NAME);
if (equals(activeEditorId, variable)) {
return EvaluationResult.TRUE;
}
return EvaluationResult.FALSE;
}
@Override
public final String toString() {
final StringBuilder buffer = new StringBuilder();
buffer.append("LegacyEditorActionBarExpression("); //$NON-NLS-1$
buffer.append(activeEditorId);
buffer.append(')');
return buffer.toString();
}
}
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