Source Code Cross Referenced for LegacyActionSetExpression.java in  » IDE-Eclipse » ui-workbench » org » eclipse » ui » internal » expressions » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Eclipse » ui workbench » org.eclipse.ui.internal.expressions 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*******************************************************************************
002:         * Copyright (c) 2006 IBM Corporation and others.
003:         * All rights reserved. This program and the accompanying materials
004:         * are made available under the terms of the Eclipse Public License v1.0
005:         * which accompanies this distribution, and is available at
006:         * http://www.eclipse.org/legal/epl-v10.html
007:         *
008:         * Contributors:
009:         *     IBM Corporation - initial API and implementation
010:         ******************************************************************************/package org.eclipse.ui.internal.expressions;
011:
012:        import org.eclipse.core.expressions.EvaluationResult;
013:        import org.eclipse.core.expressions.ExpressionInfo;
014:        import org.eclipse.core.expressions.IEvaluationContext;
015:        import org.eclipse.core.runtime.CoreException;
016:        import org.eclipse.ui.ISources;
017:        import org.eclipse.ui.IWorkbenchWindow;
018:        import org.eclipse.ui.internal.registry.IActionSetDescriptor;
019:
020:        /**
021:         * <p>
022:         * An expression that evaluates whether a particular action set is active.
023:         * </p>
024:         * <p>
025:         * This class is not intended for use outside of the
026:         * <code>org.eclipse.ui.workbench</code> plug-in.
027:         * </p>
028:         * 
029:         * @since 3.2
030:         */
031:        public final class LegacyActionSetExpression extends
032:                WorkbenchWindowExpression {
033:
034:            /**
035:             * The seed for the hash code for all schemes.
036:             */
037:            private static final int HASH_INITIAL = LegacyActionSetExpression.class
038:                    .getName().hashCode();
039:
040:            /**
041:             * The identifier of the action set that must be active for this expression
042:             * to evaluate to <code>true</code>. This value is never
043:             * <code>null</code>.
044:             */
045:            private final String actionSetId;
046:
047:            /**
048:             * Constructs a new instance of {@link LegacyActionSetExpression}.
049:             * 
050:             * @param actionSetId
051:             *            The identifier of the action set that must be active for this
052:             *            expression to evaluate to <code>true</code>; must not be
053:             *            <code>null</code>.
054:             * @param window
055:             *            The workbench window in which this handler should be active.
056:             *            This avoids conflicts between handlers from different windows.
057:             *            This should not be <code>null</code>.
058:             */
059:            public LegacyActionSetExpression(final String actionSetId,
060:                    final IWorkbenchWindow window) {
061:                super (window);
062:                if (actionSetId == null) {
063:                    throw new NullPointerException(
064:                            "The action set identifier cannot be null"); //$NON-NLS-1$
065:                }
066:                this .actionSetId = actionSetId;
067:            }
068:
069:            public final void collectExpressionInfo(final ExpressionInfo info) {
070:                super .collectExpressionInfo(info);
071:                info.addVariableNameAccess(ISources.ACTIVE_ACTION_SETS_NAME);
072:            }
073:
074:            protected final int computeHhashCode() {
075:                int hashCode = HASH_INITIAL * HASH_FACTOR
076:                        + hashCode(getWindow());
077:                hashCode = hashCode * HASH_FACTOR + hashCode(actionSetId);
078:                return hashCode;
079:            }
080:
081:            public final boolean equals(final Object object) {
082:                if (object instanceof  LegacyActionSetExpression) {
083:                    final LegacyActionSetExpression that = (LegacyActionSetExpression) object;
084:                    return equals(this .actionSetId, that.actionSetId)
085:                            && equals(this .getWindow(), that.getWindow());
086:                }
087:
088:                return false;
089:            }
090:
091:            public final EvaluationResult evaluate(
092:                    final IEvaluationContext context) throws CoreException {
093:                final EvaluationResult result = super .evaluate(context);
094:                if (result == EvaluationResult.FALSE) {
095:                    return result;
096:                }
097:
098:                // Check the action sets.
099:                final Object variable = context
100:                        .getVariable(ISources.ACTIVE_ACTION_SETS_NAME);
101:                if (variable instanceof  IActionSetDescriptor[]) {
102:                    final IActionSetDescriptor[] descriptors = (IActionSetDescriptor[]) variable;
103:                    for (int i = 0; i < descriptors.length; i++) {
104:                        final IActionSetDescriptor descriptor = descriptors[i];
105:                        final String currentId = descriptor.getId();
106:                        if (actionSetId.equals(currentId)) {
107:                            return EvaluationResult.TRUE;
108:                        }
109:                    }
110:                }
111:
112:                return EvaluationResult.FALSE;
113:            }
114:
115:            public final String toString() {
116:                final StringBuffer buffer = new StringBuffer();
117:                buffer.append("ActionSetExpression("); //$NON-NLS-1$
118:                buffer.append(actionSetId);
119:                buffer.append(',');
120:                buffer.append(getWindow());
121:                buffer.append(')');
122:                return buffer.toString();
123:            }
124:        }
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