org.apache.tools.ant.types.resources.StringResource 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
*
* 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.types.resources;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.types.Reference;
import org.apache.tools.ant.types.Resource;
/**
* Exposes a string as a Resource.
* @since Ant 1.7
*/
public class StringResource extends Resource {
/** Magic number */
private static final int STRING_MAGIC
= Resource.getMagicNumber("StringResource".getBytes());
private static final String DEFAULT_ENCODING = "UTF-8";
private String encoding = DEFAULT_ENCODING;
/**
* Default constructor.
*/
public StringResource() {
}
/**
* Construct a StringResource with the supplied value.
* @param value the value of this StringResource.
*/
public StringResource(String value) {
this(null, value);
}
/**
* Construct a StringResource with the supplied project and value,
* doing property replacement against the project if non-null.
* @param project the owning Project.
* @param value the value of this StringResource.
*/
public StringResource(Project project, String value) {
setProject(project);
setValue(project == null ? value : project.replaceProperties(value));
}
/**
* Enforce String immutability.
* @param s the new name/value for this StringResource.
*/
@Override
public synchronized void setName(String s) {
if (getName() != null) {
throw new BuildException(new ImmutableResourceException());
}
super.setName(s);
}
/**
* The value attribute is a semantically superior alias for the name attribute.
* @param s the String's value.
*/
public synchronized void setValue(String s) {
setName(s);
}
/**
* Synchronize access.
* @return the name/value of this StringResource.
*/
@Override
public synchronized String getName() {
return super.getName();
}
/**
* Get the value of this StringResource, resolving to the root reference if needed.
* @return the represented String.
*/
public synchronized String getValue() {
return getName();
}
/**
* The exists attribute tells whether a resource exists.
*
* @return true if this resource exists.
*/
@Override
public boolean isExists() {
return getValue() != null;
}
/**
* Add nested text to this resource.
* Properties will be expanded during this process.
* @since Ant 1.7.1
* @param text text to use as the string resource
*/
public void addText(String text) {
checkChildrenAllowed();
setValue(getProject().replaceProperties(text));
}
/**
* Set the encoding to be used for this StringResource.
* @param s the encoding name.
*/
public synchronized void setEncoding(String s) {
checkAttributesAllowed();
encoding = s;
}
/**
* Get the encoding used by this StringResource.
* @return the encoding name.
*/
public synchronized String getEncoding() {
return encoding;
}
/**
* Get the size of this Resource.
* @return the size, as a long, 0 if the Resource does not exist (for
* compatibility with java.io.File), or UNKNOWN_SIZE if not known.
*/
@Override
public synchronized long getSize() {
return isReference() ? getRef().getSize()
: getContent().length();
}
/**
* Get the hash code for this Resource.
* @return hash code as int.
*/
@Override
public synchronized int hashCode() { //NOSONAR
// super.equals + super.compareTo are consistent with this implementation
if (isReference()) {
return getRef().hashCode();
}
return super.hashCode() * STRING_MAGIC;
}
/**
* Get the string. See {@link #getContent()}
*
* @return the string contents of the resource.
* @since Ant 1.7
*/
@Override
public String toString() {
return String.valueOf(getContent());
}
/**
* Get an InputStream for the Resource.
* @return an InputStream containing this Resource's content.
* @throws IOException if unable to provide the content of this
* Resource as a stream.
* @throws UnsupportedOperationException if InputStreams are not
* supported for this Resource type.
*/
@Override
public synchronized InputStream getInputStream() throws IOException {
if (isReference()) {
return getRef().getInputStream();
}
String content = getContent();
if (content == null) {
throw new IllegalStateException("unset string value");
}
return new ByteArrayInputStream(encoding == null
? content.getBytes() : content.getBytes(encoding));
}
/**
* Get an OutputStream for the Resource.
* @return an OutputStream to which content can be written.
* @throws IOException if unable to provide the content of this
* Resource as a stream.
* @throws UnsupportedOperationException if OutputStreams are not
* supported for this Resource type.
*/
@Override
public synchronized OutputStream getOutputStream() throws IOException {
if (isReference()) {
return getRef().getOutputStream();
}
if (getValue() != null) {
throw new ImmutableResourceException();
}
return new StringResourceFilterOutputStream();
}
/**
* Overrides the super version.
* @param r the Reference to set.
*/
@Override
public void setRefid(Reference r) {
if (encoding != DEFAULT_ENCODING) {
throw tooManyAttributes();
}
super.setRefid(r);
}
/**
* Get the content of this StringResource. See {@link #getValue()}
* @return a String or null if there is no value.
*/
protected synchronized String getContent() {
return getValue();
}
@Override
protected StringResource getRef() {
return getCheckedRef(StringResource.class);
}
private class StringResourceFilterOutputStream extends FilterOutputStream {
private final ByteArrayOutputStream baos;
public StringResourceFilterOutputStream() {
super(new ByteArrayOutputStream());
baos = (ByteArrayOutputStream) out;
}
@Override
public void close() throws IOException {
super.close();
String result = encoding == null
? baos.toString() : baos.toString(encoding);
setValueFromOutputStream(result);
}
private void setValueFromOutputStream(String output) {
String value;
if (getProject() != null) {
value = getProject().replaceProperties(output);
} else {
value = output;
}
setValue(value);
}
}
}