137 lines
4.3 KiB
Java
137 lines
4.3 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package javax.el;
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import java.beans.FeatureDescriptor;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.Objects;
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public class MapELResolver extends ELResolver {
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private static final Class<?> UNMODIFIABLE =
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Collections.unmodifiableMap(new HashMap<>()).getClass();
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private final boolean readOnly;
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public MapELResolver() {
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this.readOnly = false;
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}
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public MapELResolver(boolean readOnly) {
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this.readOnly = readOnly;
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}
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@Override
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public Class<?> getType(ELContext context, Object base, Object property) {
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Objects.requireNonNull(context);
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if (base instanceof Map<?,?>) {
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context.setPropertyResolved(base, property);
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return Object.class;
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}
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return null;
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}
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@Override
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public Object getValue(ELContext context, Object base, Object property) {
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Objects.requireNonNull(context);
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if (base instanceof Map<?,?>) {
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context.setPropertyResolved(base, property);
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return ((Map<?,?>) base).get(property);
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}
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return null;
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}
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@Override
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public void setValue(ELContext context, Object base, Object property,
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Object value) {
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Objects.requireNonNull(context);
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if (base instanceof Map<?, ?>) {
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context.setPropertyResolved(base, property);
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if (this.readOnly) {
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throw new PropertyNotWritableException(Util.message(context,
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"resolverNotWriteable", base.getClass().getName()));
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}
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try {
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@SuppressWarnings("unchecked") // Must be OK
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Map<Object, Object> map = ((Map<Object, Object>) base);
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map.put(property, value);
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} catch (UnsupportedOperationException e) {
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throw new PropertyNotWritableException(e);
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}
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}
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}
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@Override
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public boolean isReadOnly(ELContext context, Object base, Object property) {
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Objects.requireNonNull(context);
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if (base instanceof Map<?, ?>) {
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context.setPropertyResolved(base, property);
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return this.readOnly || UNMODIFIABLE.equals(base.getClass());
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}
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return this.readOnly;
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}
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@Override
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public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
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if (base instanceof Map<?, ?>) {
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Iterator<?> itr = ((Map<?, ?>) base).keySet().iterator();
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List<FeatureDescriptor> feats = new ArrayList<>();
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Object key;
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FeatureDescriptor desc;
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while (itr.hasNext()) {
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key = itr.next();
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desc = new FeatureDescriptor();
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desc.setDisplayName(key.toString());
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desc.setShortDescription("");
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desc.setExpert(false);
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desc.setHidden(false);
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desc.setName(key.toString());
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desc.setPreferred(true);
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desc.setValue(RESOLVABLE_AT_DESIGN_TIME, Boolean.TRUE);
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desc.setValue(TYPE, key.getClass());
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feats.add(desc);
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}
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return feats.iterator();
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}
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return null;
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}
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@Override
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public Class<?> getCommonPropertyType(ELContext context, Object base) {
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if (base instanceof Map<?, ?>) {
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return Object.class;
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}
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return null;
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}
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}
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