| /* |
| * 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.camel.support; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Iterator; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import org.apache.camel.CamelContext; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.NoTypeConversionAvailableException; |
| import org.apache.camel.RuntimeCamelException; |
| import org.apache.camel.util.IOHelper; |
| |
| /** |
| * Group based {@link Iterator} which groups the given {@link Iterator} a number of times |
| * and then return a combined response as a String. |
| * <p/> |
| * This implementation uses an internal byte array buffer, to combine the response. |
| * The token is inserted between the individual parts. |
| * <p/> |
| * For example if you group by new line, then a new line token is inserted between the lines. |
| */ |
| public final class GroupTokenIterator implements Iterator<Object>, Closeable { |
| |
| private final CamelContext camelContext; |
| private final Exchange exchange; |
| private final Iterator<?> it; |
| private final String token; |
| private final int group; |
| private final boolean skipFirst; |
| private final AtomicBoolean hasSkipFirst; |
| private boolean closed; |
| private final ByteArrayOutputStream bos = new ByteArrayOutputStream(); |
| |
| /** |
| * Creates a new token based group iterator |
| * |
| * @param exchange the exchange used to create this group iterator |
| * @param it the iterator to group |
| * @param token then token used to separate between the parts, use <tt>null</tt> to not add the token |
| * @param group number of parts to group together |
| * @throws IllegalArgumentException is thrown if group is not a positive number |
| */ |
| public GroupTokenIterator(Exchange exchange, Iterator<?> it, String token, int group, boolean skipFirst) { |
| this.exchange = exchange; |
| this.camelContext = exchange.getContext(); |
| this.it = it; |
| this.token = token; |
| this.group = group; |
| if (group <= 0) { |
| throw new IllegalArgumentException("Group must be a positive number, was: " + group); |
| } |
| this.skipFirst = skipFirst; |
| if (skipFirst) { |
| this.hasSkipFirst = new AtomicBoolean(); |
| } else { |
| this.hasSkipFirst = null; |
| } |
| } |
| |
| @Override |
| public void close() throws IOException { |
| try { |
| IOHelper.closeIterator(it); |
| } finally { |
| // close the buffer as well |
| bos.close(); |
| // we are now closed |
| closed = true; |
| } |
| } |
| |
| @Override |
| public boolean hasNext() { |
| if (closed) { |
| return false; |
| } |
| |
| boolean answer = it.hasNext(); |
| if (!answer) { |
| // auto close |
| try { |
| close(); |
| } catch (IOException e) { |
| // ignore |
| } |
| } |
| return answer; |
| } |
| |
| @Override |
| public Object next() { |
| try { |
| return doNext(); |
| } catch (Exception e) { |
| throw RuntimeCamelException.wrapRuntimeCamelException(e); |
| } |
| } |
| |
| private Object doNext() throws IOException, NoTypeConversionAvailableException { |
| int count = 0; |
| Object data = ""; |
| while (count < group && it.hasNext()) { |
| data = it.next(); |
| |
| if (skipFirst && hasSkipFirst.compareAndSet(false, true)) { |
| if (it.hasNext()) { |
| data = it.next(); |
| } else { |
| // Content with header only which is marked to skip |
| data = ""; |
| } |
| } |
| |
| // include token in between |
| if (data != null && count > 0 && token != null) { |
| bos.write(token.getBytes()); |
| } |
| if (data instanceof InputStream) { |
| InputStream is = (InputStream) data; |
| IOHelper.copy(is, bos); |
| } else if (data instanceof byte[]) { |
| byte[] bytes = (byte[]) data; |
| bos.write(bytes); |
| } else if (data != null) { |
| // convert to input stream |
| InputStream is = camelContext.getTypeConverter().mandatoryConvertTo(InputStream.class, exchange, data); |
| IOHelper.copy(is, bos); |
| } |
| |
| count++; |
| } |
| |
| // prepare and return answer as String using exchange's charset |
| String answer = bos.toString(ExchangeHelper.getCharsetName(exchange)); |
| bos.reset(); |
| return answer; |
| } |
| |
| @Override |
| public void remove() { |
| it.remove(); |
| } |
| } |