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/*
* Copyright (c) 2018 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.internal.migrator.tasks;
import org.apache.tools.ant.BuildException;
import java.io.File;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* @author Eike Stepper
*/
public class ExpandTemplateTask extends CDOTask
{
private final List<TemplateProperty> templateProperties = new ArrayList<TemplateProperty>();
private File template;
private File target;
private String placeholderPrefix = "%%";
private String placeholderSuffix = "%%";
public TemplateProperty createTemplateProperty()
{
TemplateProperty templateProperty = new TemplateProperty();
templateProperties.add(templateProperty);
return templateProperty;
}
public void setTemplate(File template)
{
this.template = template;
}
public void setPlaceholderPrefix(String placeholderPrefix)
{
this.placeholderPrefix = placeholderPrefix;
}
public void setPlaceholderSuffix(String placeholderSuffix)
{
this.placeholderSuffix = placeholderSuffix;
}
public void setTarget(File target)
{
this.target = target;
}
@Override
protected void checkAttributes() throws BuildException
{
assertTrue("'template' must be specified.", template != null);
assertTrue("'template' must be point to an existing file.", template.isFile());
assertTrue("'target' must be specified.", target != null);
assertTrue("'placeholderPrefix' must be specified.", placeholderPrefix != null && placeholderPrefix.length() != 0);
assertTrue("'placeholderSuffix' must be specified.", placeholderSuffix != null && placeholderSuffix.length() != 0);
for (TemplateProperty templateProperty : templateProperties)
{
String name = templateProperty.getName();
assertTrue("'name' of property must be specified.", name != null && name.length() != 0);
}
}
@Override
protected void doExecute() throws Exception
{
verbose("Expanding template " + template + " to target " + target);
String content = readTextFile(template);
Map<String, String> properties = getProperties();
String result = generate(content, properties);
writeTextFile(target, result);
}
protected String generate(String content, Map<String, String> properties) throws Exception
{
StringBuilder result = new StringBuilder(content);
for (Map.Entry<String, String> entry : properties.entrySet())
{
String placeholder = formatPlaceholder(entry.getKey());
String value = entry.getValue();
if (value == null)
{
value = "";
}
int placeholderLength = placeholder.length();
int valueLength = value.length();
int start = 0;
for (;;)
{
int pos = result.indexOf(placeholder, start);
if (pos == -1)
{
break;
}
verbose("Expanding template property '" + entry.getKey() + "' at position " + pos);
result.replace(pos, pos + placeholderLength, value);
start = pos + valueLength;
}
}
return result.toString();
}
protected String formatPlaceholder(String name)
{
return placeholderPrefix + name + placeholderSuffix;
}
protected Map<String, String> getProperties()
{
Map<String, String> result = new LinkedHashMap<String, String>();
for (TemplateProperty templateProperty : templateProperties)
{
result.put(templateProperty.getName(), templateProperty.getValue());
}
return result;
}
/**
* @author Eike Stepper
*/
public static final class TemplateProperty
{
private String name;
private String value;
public TemplateProperty()
{
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public String getValue()
{
return value;
}
public void setValue(String value)
{
this.value = value;
}
@Override
public String toString()
{
StringBuilder builder = new StringBuilder();
builder.append(name);
builder.append(" = ");
builder.append(value);
return builder.toString();
}
}
}
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