| /* |
| * 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 |
| * |
| * https://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.tools.ant.filters; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.Reader; |
| import java.util.Hashtable; |
| import java.util.Map; |
| import java.util.Properties; |
| import java.util.SortedMap; |
| import java.util.TreeMap; |
| |
| import org.apache.tools.ant.Project; |
| import org.apache.tools.ant.types.Parameter; |
| import org.apache.tools.ant.types.Resource; |
| import org.apache.tools.ant.types.resources.FileResource; |
| import org.apache.tools.ant.util.FileUtils; |
| |
| /** |
| * Replaces tokens in the original input with user-supplied values. |
| * |
| * Example: |
| * |
| * <pre><replacetokens begintoken="#" endtoken="#"> |
| * <token key="DATE" value="${TODAY}"/> |
| * </replacetokens></pre> |
| * |
| * Or: |
| * |
| * <pre><filterreader classname="org.apache.tools.ant.filters.ReplaceTokens"> |
| * <param type="tokenchar" name="begintoken" value="#"/> |
| * <param type="tokenchar" name="endtoken" value="#"/> |
| * <param type="token" name="DATE" value="${TODAY}"/> |
| * </filterreader></pre> |
| * |
| */ |
| public final class ReplaceTokens |
| extends BaseParamFilterReader |
| implements ChainableReader { |
| /** Default "begin token" character. */ |
| private static final String DEFAULT_BEGIN_TOKEN = "@"; |
| |
| /** Default "end token" character. */ |
| private static final String DEFAULT_END_TOKEN = "@"; |
| |
| /** Hashtable to holds the original replacee-replacer pairs (String to String). */ |
| private Hashtable<String, String> hash = new Hashtable<>(); |
| |
| /** This map holds the "resolved" tokens (begin- and end-tokens are added to make searching simpler) */ |
| private final TreeMap<String, String> resolvedTokens = new TreeMap<>(); |
| private boolean resolvedTokensBuilt = false; |
| /** Used for comparisons and lookup into the resolvedTokens map. */ |
| private String readBuffer = ""; |
| |
| /** replacement test from a token */ |
| private String replaceData = null; |
| |
| /** Index into replacement data */ |
| private int replaceIndex = -1; |
| |
| /** Character marking the beginning of a token. */ |
| private String beginToken = DEFAULT_BEGIN_TOKEN; |
| |
| /** Character marking the end of a token. */ |
| private String endToken = DEFAULT_END_TOKEN; |
| |
| /** |
| * Constructor for "dummy" instances. |
| * |
| * @see BaseFilterReader#BaseFilterReader() |
| */ |
| public ReplaceTokens() { |
| } |
| |
| /** |
| * Creates a new filtered reader. |
| * |
| * @param in A Reader object providing the underlying stream. |
| * Must not be <code>null</code>. |
| */ |
| public ReplaceTokens(final Reader in) { |
| super(in); |
| } |
| |
| /** |
| * Returns the next character in the filtered stream, replacing tokens |
| * from the original stream. |
| * |
| * @return the next character in the resulting stream, or -1 |
| * if the end of the resulting stream has been reached |
| * |
| * @exception IOException if the underlying stream throws an IOException |
| * during reading |
| */ |
| public int read() throws IOException { |
| if (!getInitialized()) { |
| initialize(); |
| setInitialized(true); |
| } |
| |
| if (!resolvedTokensBuilt) { |
| // build the resolved tokens tree map. |
| for (Map.Entry<String, String> entry : hash.entrySet()) { |
| resolvedTokens.put(beginToken + entry.getKey() + endToken, entry.getValue()); |
| } |
| resolvedTokensBuilt = true; |
| } |
| |
| // are we currently serving replace data? |
| if (replaceData != null) { |
| if (replaceIndex < replaceData.length()) { |
| return replaceData.charAt(replaceIndex++); |
| } else { |
| replaceData = null; |
| } |
| } |
| |
| // is the read buffer empty? |
| if (readBuffer.isEmpty()) { |
| int next = in.read(); |
| if (next == -1) { |
| return next; // end of stream. all buffers empty. |
| } |
| readBuffer += (char) next; |
| } |
| |
| for (;;) { |
| // get the closest tokens |
| SortedMap<String, String> possibleTokens = resolvedTokens.tailMap(readBuffer); |
| if (possibleTokens.isEmpty() || !possibleTokens.firstKey().startsWith(readBuffer)) { // if there is none, then deliver the first char from the buffer. |
| return getFirstCharacterFromReadBuffer(); |
| } else if (readBuffer.equals(possibleTokens.firstKey())) { // there exists a nearest token - is it an exact match? |
| // we have found a token. prepare the replaceData buffer. |
| replaceData = resolvedTokens.get(readBuffer); |
| replaceIndex = 0; |
| readBuffer = ""; // destroy the readBuffer - it's contents are being replaced entirely. |
| // get the first character via recursive call. |
| return read(); |
| } else { // nearest token is not matching exactly - read one character more. |
| int next = in.read(); |
| if (next != -1) { |
| readBuffer += (char) next; |
| } else { |
| return getFirstCharacterFromReadBuffer(); // end of stream. deliver remaining characters from buffer. |
| } |
| } |
| } |
| } |
| |
| /** |
| * @return the first character from the read buffer or -1 if read buffer is empty. |
| */ |
| private int getFirstCharacterFromReadBuffer() { |
| if (readBuffer.isEmpty()) { |
| return -1; |
| } |
| |
| int chr = readBuffer.charAt(0); |
| readBuffer = readBuffer.substring(1); |
| return chr; |
| } |
| |
| /** |
| * Sets the "begin token" character. |
| * |
| * @param beginToken the character used to denote the beginning of a token |
| */ |
| public void setBeginToken(final String beginToken) { |
| this.beginToken = beginToken; |
| } |
| |
| /** |
| * Returns the "begin token" character. |
| * |
| * @return the character used to denote the beginning of a token |
| */ |
| private String getBeginToken() { |
| return beginToken; |
| } |
| |
| /** |
| * Sets the "end token" character. |
| * |
| * @param endToken the character used to denote the end of a token |
| */ |
| public void setEndToken(final String endToken) { |
| this.endToken = endToken; |
| } |
| |
| /** |
| * Returns the "end token" character. |
| * |
| * @return the character used to denote the end of a token |
| */ |
| private String getEndToken() { |
| return endToken; |
| } |
| |
| /** |
| * A resource containing properties, each of which is interpreted |
| * as a token/value pair. |
| * |
| * @param r Resource |
| * @since Ant 1.8.0 |
| */ |
| public void setPropertiesResource(Resource r) { |
| makeTokensFromProperties(r); |
| } |
| |
| /** |
| * Adds a token element to the map of tokens to replace. |
| * |
| * @param token The token to add to the map of replacements. |
| * Must not be <code>null</code>. |
| */ |
| public void addConfiguredToken(final Token token) { |
| hash.put(token.getKey(), token.getValue()); |
| resolvedTokensBuilt = false; // invalidate to build them again if they have been built already. |
| } |
| |
| /** |
| * Returns properties from a specified properties file. |
| * |
| * @param resource The resource to load properties from. |
| */ |
| private Properties getProperties(Resource resource) { |
| InputStream in = null; |
| Properties props = new Properties(); |
| try { |
| in = resource.getInputStream(); |
| props.load(in); |
| } catch (IOException ioe) { |
| if (getProject() != null) { |
| getProject().log("getProperties failed, " + ioe.getMessage(), Project.MSG_ERR); |
| } else { |
| ioe.printStackTrace(); //NOSONAR |
| } |
| } finally { |
| FileUtils.close(in); |
| } |
| |
| return props; |
| } |
| |
| /** |
| * Sets the map of tokens to replace. |
| * |
| * @param hash A map (String->String) of token keys to replacement |
| * values. Must not be <code>null</code>. |
| */ |
| private void setTokens(final Hashtable<String, String> hash) { |
| this.hash = hash; |
| } |
| |
| /** |
| * Returns the map of tokens which will be replaced. |
| * |
| * @return a map (String->String) of token keys to replacement |
| * values |
| */ |
| private Hashtable<String, String> getTokens() { |
| return hash; |
| } |
| |
| /** |
| * Creates a new ReplaceTokens using the passed in |
| * Reader for instantiation. |
| * |
| * @param rdr A Reader object providing the underlying stream. |
| * Must not be <code>null</code>. |
| * |
| * @return a new filter based on this configuration, but filtering |
| * the specified reader |
| */ |
| public Reader chain(final Reader rdr) { |
| ReplaceTokens newFilter = new ReplaceTokens(rdr); |
| newFilter.setBeginToken(getBeginToken()); |
| newFilter.setEndToken(getEndToken()); |
| newFilter.setTokens(getTokens()); |
| newFilter.setInitialized(true); |
| return newFilter; |
| } |
| |
| /** |
| * Initializes tokens and loads the replacee-replacer hashtable. |
| */ |
| private void initialize() { |
| Parameter[] params = getParameters(); |
| if (params != null) { |
| for (Parameter param : params) { |
| if (param != null) { |
| final String type = param.getType(); |
| if ("tokenchar".equals(type)) { |
| final String name = param.getName(); |
| if ("begintoken".equals(name)) { |
| beginToken = param.getValue(); |
| } else if ("endtoken".equals(name)) { |
| endToken = param.getValue(); |
| } |
| } else if ("token".equals(type)) { |
| final String name = param.getName(); |
| final String value = param.getValue(); |
| hash.put(name, value); |
| } else if ("propertiesfile".equals(type)) { |
| makeTokensFromProperties( |
| new FileResource(new File(param.getValue()))); |
| } |
| } |
| } |
| } |
| } |
| |
| private void makeTokensFromProperties(Resource r) { |
| Properties props = getProperties(r); |
| props.stringPropertyNames().forEach(key -> hash.put(key, props.getProperty(key))); |
| } |
| |
| /** |
| * Holds a token |
| */ |
| public static class Token { |
| |
| /** Token key */ |
| private String key; |
| |
| /** Token value */ |
| private String value; |
| |
| /** |
| * Sets the token key |
| * |
| * @param key The key for this token. Must not be <code>null</code>. |
| */ |
| public final void setKey(String key) { |
| this.key = key; |
| } |
| |
| /** |
| * Sets the token value |
| * |
| * @param value The value for this token. Must not be <code>null</code>. |
| */ |
| public final void setValue(String value) { |
| this.value = value; |
| } |
| |
| /** |
| * Returns the key for this token. |
| * |
| * @return the key for this token |
| */ |
| public final String getKey() { |
| return key; |
| } |
| |
| /** |
| * Returns the value for this token. |
| * |
| * @return the value for this token |
| */ |
| public final String getValue() { |
| return value; |
| } |
| } |
| } |