com.greenpepper.shaded.org.apache.tools.ant.filters.ExpandProperties Maven / Gradle / Ivy
/*
* 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 com.greenpepper.shaded.org.apache.tools.ant.filters;
import java.io.IOException;
import java.io.Reader;
import com.greenpepper.shaded.org.apache.tools.ant.Project;
/**
* Expands Ant properties, if any, in the data.
*
* Example:
*
<expandproperties/>
* Or:
* <filterreader
* classname="com.greenpepper.shaded.org.apache.tools.ant.filters.ExpandProperties"/>
*
*/
public final class ExpandProperties
extends BaseFilterReader
implements ChainableReader {
/** Data that must be read from, if not null. */
private String queuedData = null;
/**
* Constructor for "dummy" instances.
*
* @see BaseFilterReader#BaseFilterReader()
*/
public ExpandProperties() {
super();
}
/**
* Creates a new filtered reader.
*
* @param in A Reader object providing the underlying stream.
* Must not be null.
*/
public ExpandProperties(final Reader in) {
super(in);
}
/**
* Returns the next character in the filtered stream. The original
* stream is first read in fully, and the Ant properties are expanded.
* The results of this expansion are then queued so they can be read
* character-by-character.
*
* @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 {
int ch = -1;
if (queuedData != null && queuedData.length() == 0) {
queuedData = null;
}
if (queuedData != null) {
ch = queuedData.charAt(0);
queuedData = queuedData.substring(1);
if (queuedData.length() == 0) {
queuedData = null;
}
} else {
queuedData = readFully();
if (queuedData == null) {
ch = -1;
} else {
Project project = getProject();
queuedData = project.replaceProperties(queuedData);
return read();
}
}
return ch;
}
/**
* Creates a new ExpandProperties filter using the passed in
* Reader for instantiation.
*
* @param rdr A Reader object providing the underlying stream.
* Must not be null.
*
* @return a new filter based on this configuration, but filtering
* the specified reader
*/
public Reader chain(final Reader rdr) {
ExpandProperties newFilter = new ExpandProperties(rdr);
newFilter.setProject(getProject());
return newFilter;
}
}