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FooTag.java
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142 lines (120 loc) · 3.61 KB
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/*
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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.
*/
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import java.util.Hashtable;
import java.io.Writer;
import java.io.IOException;
/**
* Example1: the simplest tag
* Collect attributes and call into some actions
*
* <foo att1="..." att2="...." att3="...." />
*/
/*
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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.
*/
abstract class ExampleTagBase extends BodyTagSupport {
public void setParent(Tag parent) {
this.parent = parent;
}
public void setBodyContent(BodyContent bodyOut) {
this.bodyOut = bodyOut;
}
public void setPageContext(PageContext pageContext) {
this.pageContext = pageContext;
}
public Tag getParent() {
return this.parent;
}
public int doStartTag() throws JspException {
return SKIP_BODY;
}
public int doEndTag() throws JspException {
return EVAL_PAGE;
}
// Default implementations for BodyTag methods as well
// just in case a tag decides to implement BodyTag.
public void doInitBody() throws JspException {
}
public int doAfterBody() throws JspException {
return SKIP_BODY;
}
public void release() {
bodyOut = null;
pageContext = null;
parent = null;
}
protected BodyContent bodyOut;
protected PageContext pageContext;
protected Tag parent;
}
public class FooTag
extends ExampleTagBase
{
private String atts[] = new String[3];
int i = 0;
private final void setAtt(int index, String value) {
atts[index] = value;
}
public void setAtt1(String value) {
setAtt(0, value);
}
public void setAtt2(String value) {
setAtt(1, value);
}
public void setAtt3(String value) {
setAtt(2, value);
}
/**
* Process start tag
*
* @return EVAL_BODY_INCLUDE
*/
public int doStartTag() throws JspException {
i = 0;
return EVAL_BODY_INCLUDE;
}
public void doInitBody() throws JspException {
pageContext.setAttribute("member", atts[i]);
i++;
}
public int doAfterBody() throws JspException {
try {
if (i == 3) {
bodyOut.writeOut(bodyOut.getEnclosingWriter());
return SKIP_BODY;
} else
pageContext.setAttribute("member", atts[i]);
i++;
return EVAL_BODY_AGAIN;
} catch (IOException ex) {
throw new JspTagException(ex.toString());
}
}
}