Java tutorial
/* * 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.commons.imaging.common; import java.util.ArrayList; import java.util.List; public class ImageMetadata implements IImageMetadata { private final List<IImageMetadataItem> items = new ArrayList<IImageMetadataItem>(); public void add(final String keyword, final String text) { add(new Item(keyword, text)); } public void add(final IImageMetadataItem item) { items.add(item); } public List<? extends IImageMetadataItem> getItems() { return new ArrayList<IImageMetadataItem>(items); } protected static final String newline = System.getProperty("line.separator"); @Override public String toString() { return toString(null); } public String toString(String prefix) { if (null == prefix) { prefix = ""; } final StringBuilder result = new StringBuilder(); for (int i = 0; i < items.size(); i++) { if (i > 0) { result.append(newline); } // if (null != prefix) // result.append(prefix); final ImageMetadata.IImageMetadataItem item = items.get(i); result.append(item.toString(prefix + "\t")); // Debug.debug("prefix", prefix); // Debug.debug("item", items.get(i)); // Debug.debug(); } return result.toString(); } public static class Item implements IImageMetadataItem { private final String keyword, text; public Item(final String keyword, final String text) { this.keyword = keyword; this.text = text; } public String getKeyword() { return keyword; } public String getText() { return text; } @Override public String toString() { return toString(null); } public String toString(final String prefix) { String result = keyword + ": " + text; if (null != prefix) { result = prefix + result; } return result; } } }