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43 package org.apidesign.html.context.spi;
45 import java.util.ServiceLoader;
46 import net.java.html.BrwsrCtx;
47 import org.netbeans.html.context.impl.CtxImpl;
49 /** Factory class to assign various technologies
50 * to a {@link BrwsrCtx browser context}. Start with {@link #newBuilder()}
51 * and then assign technologies with {@link Builder#register(java.lang.Class, java.lang.Object, int)}
54 * @author Jaroslav Tulach
56 public final class Contexts {
60 /** Creates new, empty builder for creation of {@link BrwsrCtx}. At the
61 * end call the {@link Builder#build()} method to generate the context.
63 * @return new instance of the builder
65 public static Builder newBuilder() {
69 /** Seeks for the specified technology in the provided context.
71 * @param <Tech> type of the technology
72 * @param context the context to seek in
73 * (previously filled with ({@link Builder#register(java.lang.Class, java.lang.Object, int)})
74 * @param technology class that identifies the technology
75 * @return the technology in the context or <code>null</code>
77 public static <Tech> Tech find(BrwsrCtx context, Class<Tech> technology) {
78 return CtxImpl.find(context, technology);
81 /** Seeks {@link ServiceLoader} for all registered instances of
82 * {@link Provider} and asks them to {@link Provider#fillContext(org.apidesign.html.context.spi.Contexts.Builder, java.lang.Class) fill
85 * @param requestor the application class for which to find the context
86 * @param cb the context builder to register technologies into
87 * @return <code>true</code>, if some instances of the provider were
88 * found, <code>false</code> otherwise
91 public static boolean fillInByProviders(Class<?> requestor, Contexts.Builder cb) {
92 boolean found = false;
95 l = requestor.getClassLoader();
96 } catch (SecurityException ex) {
99 for (Provider cp : ServiceLoader.load(Provider.class, l)) {
100 cp.fillContext(cb, requestor);
104 for (Provider cp : ServiceLoader.load(Provider.class, Provider.class.getClassLoader())) {
105 cp.fillContext(cb, requestor);
108 } catch (SecurityException ex) {
114 for (Provider cp : ServiceLoader.load(Provider.class)) {
115 cp.fillContext(cb, requestor);
122 /** Implementors of various HTML technologies should
123 * register their implementation via <code>org.openide.util.lookup.ServiceProvider</code>, so
124 * {@link ServiceLoader} can find them, when their JARs are included
125 * on the classpath of the running application.
127 * @author Jaroslav Tulach
129 public static interface Provider {
131 /** Register into the context if suitable technology is
132 * available for the requesting class.
133 * The provider should check if its own technology is available in current
134 * scope (e.g. proper JDK, proper browser, etc.). The provider
135 * can also find the right context depending on requestor's classloader, etc.
137 * Providers should use {@link Builder} to enrich appropriately
140 * @param context the context builder to fill with technologies
141 * @param requestor the application class requesting access the the HTML page
142 * @see BrwsrCtx#findDefault(java.lang.Class)
144 void fillContext(Builder context, Class<?> requestor);
147 /** Support for providers of new {@link BrwsrCtx}. Providers of different
148 * technologies should be of particular interest in this class. End users
149 * designing their application with existing technologies should rather
150 * point their attention to {@link BrwsrCtx} and co.
152 * @author Jaroslav Tulach
154 public static final class Builder {
155 private final CtxImpl impl = new CtxImpl();
160 /** Registers new technology into the context. Each technology is
161 * exactly identified by its implementation class and can be associated
162 * with (positive) priority. In case of presence of multiple technologies
163 * with the same class, the one with higher lower priority takes precedence.
164 * @param <Tech> type of technology to register
165 * @param type the real class of the technology type
166 * @param impl an instance of the technology class
167 * @param position the lower position, the more important implementation
168 * which will be consulted sooner when seeking for a {@link Contexts#find(net.java.html.BrwsrCtx, java.lang.Class)}
170 * @return this builder
172 public <Tech> Builder register(Class<Tech> type, Tech impl, int position) {
177 throw new IllegalStateException();
179 this.impl.register(type, impl, position);
183 /** Generates context based on values previously inserted into
186 * @return new, immutable instance of {@link BrwsrCtx}
188 public BrwsrCtx build() {