Skip to main content
aboutsummaryrefslogtreecommitdiffstats
blob: 2259bd01cd2bc5a5b10bf9bf99eb1c47000aaea1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
/*******************************************************************************
 * Copyright (c) 2012, 2014 Wind River Systems, 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:
 * Wind River Systems - initial API and implementation
 *******************************************************************************/
package org.eclipse.tcf.te.tcf.core.va.internal;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.eclipse.core.expressions.EvaluationContext;
import org.eclipse.core.expressions.EvaluationResult;
import org.eclipse.core.expressions.Expression;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.tcf.protocol.IPeer;
import org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager;
import org.eclipse.tcf.te.runtime.extensions.ExecutableExtensionProxy;
import org.eclipse.tcf.te.tcf.core.activator.CoreBundleActivator;


/**
 * Value-add bindings extension point manager implementation.
 */
public class BindingExtensionPointManager extends AbstractExtensionPointManager<Binding> {

	/*
	 * Thread save singleton instance creation.
	 */
	private static class LazyInstance {
		public static BindingExtensionPointManager instance = new BindingExtensionPointManager();
	}

	/**
	 * Constructor.
	 */
	BindingExtensionPointManager() {
		super();
	}

	/**
	 * Returns the singleton instance of the extension point manager.
	 */
	public static BindingExtensionPointManager getInstance() {
		return LazyInstance.instance;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager#getExtensionPointId()
	 */
	@Override
	protected String getExtensionPointId() {
		return "org.eclipse.tcf.te.tcf.core.valueaddBindings"; //$NON-NLS-1$
	}

	/* (non-Javadoc)
	 * @see org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager#getConfigurationElementName()
	 */
	@Override
	protected String getConfigurationElementName() {
		return "binding"; //$NON-NLS-1$
	}

	/* (non-Javadoc)
	 * @see org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager#doCreateExtensionProxy(org.eclipse.core.runtime.IConfigurationElement)
	 */
	@Override
	protected ExecutableExtensionProxy<Binding> doCreateExtensionProxy(IConfigurationElement element) throws CoreException {
		return new ExecutableExtensionProxy<Binding>(element) {
			/* (non-Javadoc)
			 * @see org.eclipse.tcf.te.runtime.extensions.ExecutableExtensionProxy#newInstance()
			 */
			@Override
			public Binding newInstance() {
				Binding instance = new Binding();
				try {
					instance.setInitializationData(getConfigurationElement(), null, null);
				} catch (CoreException e) {
					IStatus status = new Status(IStatus.ERROR, CoreBundleActivator.getUniqueIdentifier(),
												e.getLocalizedMessage(), e);
					Platform.getLog(CoreBundleActivator.getContext().getBundle()).log(status);
				}
				return instance;
			}
		};
	}

	/**
	 * Returns the applicable value-add bindings for the given delegate context.
	 *
	 * @param peer The peer. Must not be <code>null</code>.
	 *
	 * @return The list of applicable value-add bindings or an empty array.
	 */
	public Binding[] getApplicableBindings(IPeer peer) {
		Assert.isNotNull(peer);

		List<Binding> applicable = new ArrayList<Binding>();

		for (Binding binding : getBindings()) {
			Expression enablement = binding.getEnablement();

			// The binding is *not* applicable by default if no expression is specified.
			boolean isApplicable = false;

			if (enablement != null) {
				// Set the default variable to the peer.
				EvaluationContext evalContext = new EvaluationContext(null, peer);
				evalContext.addVariable("peer", peer); //$NON-NLS-1$
				// Allow plugin activation
				evalContext.setAllowPluginActivation(true);
				// Evaluate the expression
				try {
					isApplicable = enablement.evaluate(evalContext).equals(EvaluationResult.TRUE);
				} catch (CoreException e) {
					IStatus status = new Status(IStatus.ERROR, CoreBundleActivator.getUniqueIdentifier(), e.getLocalizedMessage(), e);
					Platform.getLog(CoreBundleActivator.getContext().getBundle()).log(status);
				}
			}

			// Add the binding if applicable
			if (isApplicable) {
				applicable.add(binding);
			}
		}

		return applicable.toArray(new Binding[applicable.size()]);
	}

	/**
	 * Returns the list of all contributed value-add bindings.
	 *
	 * @return The list of contributed value-add bindings, or an empty array.
	 */
	public Binding[] getBindings() {
		List<Binding> contributions = new ArrayList<Binding>();
		Collection<ExecutableExtensionProxy<Binding>> bindings = getExtensions().values();
		for (ExecutableExtensionProxy<Binding> binding : bindings) {
			Binding instance = binding.getInstance();
			if (instance != null && !contributions.contains(instance)) {
				contributions.add(instance);
			}
		}

		return contributions.toArray(new Binding[contributions.size()]);
	}

	/**
	 * Returns the value-add binding identified by its unique id. If no value
	 * add binding with the specified id is registered, <code>null</code> is returned.
	 *
	 * @param id The unique id of the value-add binding or <code>null</code>
	 *
	 * @return The value-add binding instance or <code>null</code>.
	 */
	public Binding getBinding(String id) {
		Binding contribution = null;
		if (getExtensions().containsKey(id)) {
			ExecutableExtensionProxy<Binding> proxy = getExtensions().get(id);
			// Get the extension instance
			contribution = proxy.getInstance();
		}

		return contribution;
	}
}

Back to the top