| /* |
| * 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.myfaces.resource; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.PushbackInputStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| import javax.el.ELContext; |
| import javax.el.ELException; |
| import javax.el.ValueExpression; |
| import javax.faces.application.Resource; |
| import javax.faces.context.FacesContext; |
| import javax.faces.event.ExceptionQueuedEvent; |
| import javax.faces.event.ExceptionQueuedEventContext; |
| |
| import org.apache.myfaces.util.lang.DynamicPushbackInputStream; |
| |
| public class ValueExpressionFilterInputStream extends InputStream |
| { |
| private final PushbackInputStream delegate; |
| private final String libraryName; |
| private final String resourceName; |
| private final String contractName; |
| |
| public ValueExpressionFilterInputStream(InputStream in, String libraryName, String resourceName) |
| { |
| super(); |
| this.delegate = new DynamicPushbackInputStream(in,300); |
| this.libraryName = libraryName; |
| this.resourceName = resourceName; |
| this.contractName = null; |
| } |
| |
| public ValueExpressionFilterInputStream(InputStream in, Resource resource) |
| { |
| super(); |
| this.delegate = new DynamicPushbackInputStream(in,300); |
| this.libraryName = resource.getLibraryName(); |
| this.resourceName = resource.getResourceName(); |
| this.contractName = (resource instanceof ContractResource) |
| ? ((ContractResource)resource).getContractName() |
| : null; |
| } |
| |
| @Override |
| public int read() throws IOException |
| { |
| int c1 = delegate.read(); |
| if (c1 == -1) |
| { |
| return -1; |
| } |
| |
| if (((char) c1) == '#') |
| { |
| int c2 = delegate.read(); |
| if (c2 == -1) |
| { |
| return -1; |
| } |
| if (((char) c2) == '{') |
| { |
| //It is a value expression. We need to look for a occurrence of } to |
| //extract the expression and evaluate it, the result should be unread. |
| List<Integer> expressionList = null; |
| int c3 = delegate.read(); |
| while (c3 != -1 && ((char) c3) != '}') |
| { |
| if (expressionList == null) |
| { |
| expressionList = new ArrayList<>(); |
| } |
| expressionList.add(c3); |
| c3 = delegate.read(); |
| } |
| |
| if (c3 == -1) |
| { |
| //get back the data, because we can't extract any value expression |
| if (expressionList != null) |
| { |
| for (int i = 0; i < expressionList.size(); i++) |
| { |
| delegate.unread(expressionList.get(i)); |
| } |
| } |
| delegate.unread(c2); |
| return c1; |
| } |
| else |
| { |
| //EL expression found. Evaluate it and pushback the result into the stream |
| FacesContext context = FacesContext.getCurrentInstance(); |
| ELContext elContext = context.getELContext(); |
| try |
| { |
| if (libraryName != null) |
| { |
| ResourceELUtils.saveResourceLibraryForResolver(context, libraryName); |
| } |
| if (contractName != null) |
| { |
| ResourceELUtils.saveResourceContractForResolver(context, contractName); |
| } |
| |
| ValueExpression ve = context.getApplication(). |
| getExpressionFactory().createValueExpression( |
| elContext, |
| "#{" + convertToExpression(expressionList) + '}', |
| String.class); |
| |
| String value = (String) ve.getValue(elContext); |
| for (int i = value.length()-1; i >= 0 ; i--) |
| { |
| delegate.unread((int) value.charAt(i)); |
| } |
| } |
| catch(ELException e) |
| { |
| ExceptionQueuedEventContext equecontext = new ExceptionQueuedEventContext( |
| context, e, null); |
| context.getApplication().publishEvent (context, ExceptionQueuedEvent.class, equecontext); |
| |
| Logger log = Logger.getLogger(ResourceImpl.class.getName()); |
| if (log.isLoggable(Level.SEVERE)) |
| { |
| log.severe("Cannot evaluate EL expression " + convertToExpression(expressionList) |
| + " in resource " + (libraryName == null ? "" : libraryName) + ':' + |
| (resourceName == null?"":resourceName)); |
| } |
| |
| delegate.unread(c3); |
| if (expressionList != null) |
| { |
| for (int i = expressionList.size()-1; i >= 0; i--) |
| { |
| delegate.unread(expressionList.get(i)); |
| } |
| } |
| delegate.unread(c2); |
| return c1; |
| } |
| finally |
| { |
| if (libraryName != null) |
| { |
| ResourceELUtils.removeResourceLibraryForResolver(context); |
| } |
| if (contractName != null) |
| { |
| ResourceELUtils.removeResourceContractForResolver(context); |
| } |
| } |
| |
| //read again |
| return delegate.read(); |
| } |
| } |
| else |
| { |
| delegate.unread(c2); |
| return c1; |
| } |
| } |
| else |
| { |
| //just continue |
| return c1; |
| } |
| } |
| |
| private String convertToExpression(List<Integer> expressionList) |
| { |
| if (expressionList == null) |
| { |
| return ""; |
| } |
| |
| char[] exprArray = new char[expressionList.size()]; |
| |
| for (int i = 0; i < expressionList.size(); i++) |
| { |
| exprArray[i] = (char) expressionList.get(i).intValue(); |
| } |
| return String.valueOf(exprArray); |
| } |
| |
| @Override |
| public void close() throws IOException |
| { |
| delegate.close(); |
| } |
| } |