| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.geronimo.gshell.interpolation; |
| |
| import org.apache.commons.jexl.Expression; |
| import org.apache.commons.jexl.ExpressionFactory; |
| import org.apache.commons.jexl.JexlContext; |
| import org.apache.commons.jexl.resolver.FlatResolver; |
| import org.apache.geronimo.gshell.command.Variables; |
| import org.apache.geronimo.gshell.notification.ErrorNotification; |
| import org.codehaus.plexus.interpolation.AbstractValueSource; |
| |
| import java.util.Collection; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * {@link org.codehaus.plexus.interpolation.ValueSource} implementation pulling data from a {@link Variables} instance. |
| * |
| * @version $Rev$ $Date$ |
| */ |
| public class VariablesValueSource |
| extends AbstractValueSource |
| { |
| private final FlatResolver resolver = new FlatResolver(true); |
| |
| private final JexlContext jexlContext; |
| |
| private Variables variables; |
| |
| public VariablesValueSource(final Variables vars) { |
| super(false); |
| |
| jexlContext = new JexlContext() { |
| private final Map map = new VariablesMapAdapter(); |
| |
| public Map getVars() { |
| return map; |
| } |
| |
| public void setVars(Map map) { |
| throw new UnsupportedOperationException(); |
| } |
| }; |
| |
| if (vars != null) { |
| setVariables(vars); |
| } |
| } |
| |
| public VariablesValueSource() { |
| this(null); |
| } |
| |
| public Variables getVariables() { |
| return variables; |
| } |
| |
| public void setVariables(final Variables variables) { |
| this.variables = variables; |
| } |
| |
| public Object getValue(final String input) { |
| assert input != null; |
| |
| if (variables == null) { |
| throw new IllegalStateException("Variables have not yet been set"); |
| } |
| |
| try { |
| Expression expr = ExpressionFactory.createExpression(input); |
| expr.addPreResolver(resolver); |
| |
| return expr.evaluate(jexlContext); |
| } |
| catch (Exception e) { |
| throw new ErrorNotification("Failed to evaluate expression: " + input, e); |
| } |
| } |
| |
| // |
| // VariablesMapAdapter |
| // |
| |
| private class VariablesMapAdapter |
| implements Map |
| { |
| private String key(final Object key) { |
| return String.valueOf(key); |
| } |
| |
| public Object get(final Object key) { |
| return variables.get(key(key)); |
| } |
| |
| public Object put(final Object key, final Object value) { |
| Object prev = variables.get(key(key)); |
| |
| variables.set(key(key), value); |
| |
| return prev; |
| } |
| |
| // Jexl does not use any of these Map methods |
| |
| public int size() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean isEmpty() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean containsKey(Object key) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean containsValue(Object value) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public Object remove(Object key) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void putAll(Map t) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void clear() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public Set keySet() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public Collection values() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public Set entrySet() { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| } |